All 700+ Free Online Calculators

Free 401k Calculator to project your retirement balance with employer match. See total contributions, employer match, and investment earnings over time.

Convert A1C percentage to estimated average blood glucose (eAG) in mg/dL and mmol/L. Understand your diabetes management.

Calculate the absolute value of any number or expression. Understand absolute value with visual number line.

Free AC Size Calculator to find the right BTU rating for your room. Factors in room size, ceiling height, sun exposure, insulation, and occupants.

Calculate acceleration from velocity change and time, or force and mass. Free physics calculator with instant results.

Estimate your ACT composite score from section scores. See percentile ranking and college readiness benchmarks.

Calculate adhesive coverage needed for flooring, tile, and other surface bonding applications.

Free Adjusted Body Weight Calculator for obese patients. Uses IBW and actual weight with a 0.4 correction factor for accurate drug dosing.

Free age calculator. Enter your date of birth to find your exact age in years, months, and days, total days lived, weeks, next birthday countdown, and more.

Calculate the age difference between two people in years, months, and days. Check the half-plus-seven dating rule and see each person's generation.

Free Alcohol Calorie Calculator. Find the calorie content of beer, wine, cocktails, spirits, and mixed drinks. Track your alcohol calories for better diet management.

Estimate spousal support payments based on income difference, marriage length, and state guidelines. Calculate potential alimony obligations.

Find the right allowance amount for your child by age. See weekly and monthly recommendations with savings and spending breakdowns.

Free amortization calculator. Enter loan amount, rate, term, and extra payments to see your monthly payment, total interest, and payoff schedule.

Free anchor size calculator. Recommended anchor weight and rode length by boat length and conditions.

Free anion gap calculator. Serum anion gap from sodium, chloride, and bicarbonate with albumin correction.

Free annuity calculator to estimate periodic payments from a lump sum or find how much to invest. Supports monthly and annual frequencies.

Calculate the area between two concentric circles (ring/annulus) from inner and outer radii.

Calculate the antilogarithm (inverse log). Find 10^x, e^x, or any base raised to a power.

Free APGAR Score Calculator for newborn assessment. Score appearance, pulse, grimace, activity, and respiration. Used at 1 and 5 minutes after birth.

Free APR calculator. Enter your loan amount, interest rate, fees, and term to calculate the true annual percentage rate, total cost, and monthly payment.

Calculate aquarium volume in gallons and liters. Get stocking recommendations, heater size, and filter flow rate for your tank.

Calculate water change volumes and dechlorinator dosage for your aquarium. Plan weekly maintenance schedule.

Free arc length calculator. Calculate arc length, sector area, and chord length from radius and angle.

Calculate recommended arrow spine based on draw weight, draw length, and arrow length. Free archery tool.

Free area converter: convert between sq mm, sq cm, sq m, sq km, sq inches, sq feet, sq yards, acres, and hectares. All units update live as you type.

Calculate the area and perimeter of a rectangle from length and width. Free online geometry calculator with instant results.

Calculate the area, perimeter, and diagonal of a square from its side length. Free online geometry calculator.

Free Area of Trapezoid Calculator. Enter the two parallel sides (bases) and height to instantly calculate the area. Shows formula and steps.

Calculate triangle area using base and height, three sides (Heron's formula), or SSS method. Free online geometry tool.

Free Army Body Fat Calculator using the U.S. Department of Defense tape test method per AR 600-9. Calculate body fat percentage from neck, waist, and hip measurements.

Convert text to ASCII codes and ASCII codes to text. View decimal, hexadecimal, binary, and octal representations.

Free aspect ratio calculator. Find aspect ratio from width and height, resize images proportionally between common ratios.

Calculate asphalt needed for driveways and parking lots. Get area, volume in cubic yards, tons of hot mix, and cost estimate.

Calculate R-value and insulation depth needed for your climate zone. Estimate material quantities for attic insulation.

Free auto loan calculator. Enter vehicle price, down payment, trade-in value, loan term and interest rate to calculate your monthly car payment and total cost.

Free average calculator: find mean, median, mode, range, sum, count, min, max, and standard deviation for any list of numbers instantly.

Free Baby Clothes Size Calculator. Find the right clothing size based on age, weight, and height. Covers newborn to 5 years.

Calculate how much baby formula your infant needs per day and week based on age and weight. Estimate formula costs and feeding schedule.

Free Baby Growth Calculator using WHO growth standards. Track weight, length, and head circumference percentiles for boys and girls from birth to 36 months.

Free Baby Sleep Calculator. Find recommended sleep hours by age from newborn to 5 years. Includes nap schedules and bedtime guidance.

Free BAC calculator using the Widmark formula. Estimate blood alcohol content by weight, gender, drinks, and time elapsed with impairment levels.

Free Backsplash Calculator. Calculate square footage of tile needed for your kitchen backsplash, accounting for cuts and waste.

Convert baking recipes between different pan sizes. Calculate scaling factors for round, square, and rectangular baking pans.

Calculate how many balloons you need for party decorations based on the area to cover and balloon size.

Free Bandwidth Calculator to estimate internet speed requirements based on number of users and online activities like streaming, gaming, video calls, and browsing.

Calculate optimal banner dimensions for events, trade shows, and storefront displays based on viewing distance.

Encode text to Base64 or decode Base64 to text instantly. Useful for developers and data handling.

Calculate earned run average and other pitching statistics.

Free Baseboard Calculator. Calculate linear feet of baseboard needed for any room, accounting for doors and waste.

Calculate basketball shooting percentage, PER, and efficiency metrics from game stats.

Free Bathroom Remodel Calculator. Estimate remodeling costs by scope: basic refresh, mid-range update, or high-end renovation.

Calculate device battery runtime from battery capacity in mAh and power draw in mA. Estimate hours of usage.

Calculate how long a battery will last from mAh capacity and device power draw. Free electronics tool.

Calculate how many pounds of meat to buy for your BBQ or cookout. Estimate per-person servings for brisket, ribs, pulled pork, burgers, and more.

Estimate your bench press one-rep max from weight and reps using Epley, Brzycki, and Lombardi formulas.

Calculate billable hours, invoice amounts, and effective hourly rate. Essential for freelancers and consultants.

Free binary calculator to convert between binary, decimal, hexadecimal, and octal. Also perform binary arithmetic: add, subtract, and multiply binary numbers.

Free Binary to Decimal Converter. Enter a binary number and see the decimal equivalent with step-by-step positional notation breakdown.

Enter your birthdate to find exact age zodiac sign Chinese zodiac birthstone birth flower generation and days until next birthday.

Free blood pressure calculator classifies your reading per AHA guidelines. Enter systolic and diastolic values to see if your BP is normal, elevated, or high.

Convert blood glucose readings between mg/dL and mmol/L instantly. Essential for international diabetes management.

Free BMI calculator with color-coded gauge. Enter your weight and height to instantly calculate your Body Mass Index and see your WHO weight category.

Free BMI Prime Calculator. Calculate your BMI Prime ratio (BMI divided by 25) to see how your weight compares to the healthy upper limit.

Free BMR calculator with Mifflin-St Jeor and Harris-Benedict formulas. Compare results from both equations to find your basal metabolic rate accurately.

Free boat fuel calculator. Estimate fuel from engine HP, speed, and trip distance for gas and diesel.

Calculate monthly payments and total cost for marine financing. Compare boat loan terms and rates.

Free body fat percentage calculator using the US Navy formula. Enter your measurements to estimate body fat, lean mass, and see your fitness category instantly.

Free Body Surface Area Calculator. Calculate BSA using Du Bois, Mosteller, Haycock, and Boyd formulas. Supports imperial and metric units for height and weight.

Calculate boiling point elevation from solute concentration using the colligative property formula.

Free Bond Calculator to compute current yield, approximate yield to maturity (YTM), and total return. Enter face value, coupon rate, maturity, and market price.

Calculate federal and state taxes on your bonus. See the difference between aggregate and flat rate withholding methods.

Calculate your bowling score with strikes, spares, and frame-by-frame tracking.

Free BPM calculator with tap tempo. Tap to find beats per minute, or enter BPM to get milliseconds per beat and tempo markings.

Free Bra Size Calculator. Find your correct US, UK, and EU bra size from underbust and bust measurements. Includes sister sizes and fitting tips for a perfect fit.

Estimate when your brake pads need replacement based on driving style, mileage, and conditions. Plan maintenance and budget for brake service.

Calculate bread ingredients using baker percentages. Scale recipes by flour weight for consistent results.

Calculate break-even point in units and revenue. Enter fixed costs, variable costs, and selling price to find when your business becomes profitable.

Free Breastfeeding Calorie Calculator. Estimate additional calories needed while breastfeeding based on feeding frequency and maternal activity.

Calculate bricks needed for a wall or project. Account for mortar joints, waste, and openings.

Free BSA calculator. Body Surface Area using Mosteller and Du Bois formulas for drug dosing.

Calculate BTU requirements for heating and cooling. Enter room dimensions, insulation, and climate zone to find the right AC or heater size.

Free Budget Calculator to plan your monthly spending. Track expenses by category, see surplus or deficit, and compare your budget to the 50/30/20 rule.

Calculate buoyant force using Archimedes' principle. Find if an object floats or sinks in a fluid.

Calculate how many business cards you need and estimate total printing costs for your networking needs.

Calculate the correct cable gauge for electrical installations based on current, distance, and acceptable voltage drop.

Free CAGR Calculator to compute compound annual growth rate or future value of investments. Enter initial value, final value, and years to get CAGR instantly.

Free Cake Serving Calculator. Estimate how many servings you get from round or rectangular cakes based on size and serving style.

Free calorie calculator using the Mifflin-St Jeor equation. Find your BMR, TDEE, and recommended daily calories for weight loss, maintenance, or muscle gain.

Free calories burned calculator for 30+ activities. Enter your weight, activity, and duration to estimate calories burned and see fun food equivalents.

Calculate how many canning jars you need for your recipe yield. Convert between jar sizes and estimate produce needed for canning.

Calculate the capitalization rate for investment properties. Determine if a rental property is a good investment based on NOI and purchase price.

Free capacitor calculator. Series and parallel capacitance, RC time constant, and stored energy.

Calculate short-term and long-term capital gains tax for 2025. Enter purchase price, sale price, holding period, and income to see tax owed and net proceeds.

Calculate vehicle depreciation. Enter purchase price and age to see current value total depreciation and year-by-year depreciation chart.

Estimate monthly car insurance costs based on age, driving record, coverage type, and vehicle value.

Free Car Loan Calculator to estimate monthly payments, total interest, and compare loan terms. Enter vehicle price, down payment, trade-in value, and tax rate.

Calculate annual car wash and detailing costs. Compare DIY washing vs professional car wash services and find the best value.

Free carbohydrate calculator. Calculate your daily carb intake based on weight, age, activity level, and goals. Get grams, calories, and fiber targets.

Free Carbon Footprint Calculator to estimate your annual CO2 emissions from energy, transport, diet, and shopping. Includes breakdown donut chart.

Calculate carpet needed for any room. Get square footage, yards, and estimated cost with waste factor.

Estimate carpet cleaning costs by room count or square footage. Compare professional vs DIY costs.

Track monthly business cash flow. Enter income and expenses to see net cash flow, burn rate, and runway.

Calculate cash-on-cash return for rental investment properties. Measure annual pre-tax cash flow as a percentage of total cash invested.

Convert cat years to human years using modern veterinary formulas. Understand your cat life stage and age-appropriate care.

Calculate daily food portions for your cat based on weight and age. Get accurate feeding amounts in cups and calories.

Calculate how many tubes of caulk you need based on joint length, width, and depth.

Free CD calculator to estimate interest earned and final balance on certificates of deposit. Compare daily, monthly, and quarterly compounding with APY vs APR.

Calculate your tax deduction from charitable donations. Estimate tax savings from cash and property contributions.

Calculate chi-square test statistic from observed and expected values. Determine statistical significance.

Free Child BMI Calculator with age and sex-specific percentiles. Uses CDC growth charts for children ages 2-20.

Find the right clothing size for your child based on age, height, and weight. US kids clothing size chart for boys and girls.

Free Child Cost Calculator to estimate the cost of raising a child from birth to 18 by country and income level. See annual breakdowns with a bar chart.

Predict your child future adult height using parent heights. Based on the mid-parent height formula.

Estimate child support payments based on income, custody arrangement, and number of children. General guidelines for US child support calculations.

Calculate the correct chimney flue size based on fireplace or stove BTU output and type.

Calculate total cholesterol to HDL ratio, LDL to HDL ratio, and triglyceride to HDL ratio. Assess cardiovascular risk.

Free circle calculator: enter any one value (radius, diameter, circumference, or area) to instantly calculate all four with a visual circle diagram.

Calculate circle circumference and area from radius or diameter. Free online geometry calculator with instant results.

Calculate your class rank percentile from rank position and class size. Free education tool.

Free Closet Organizer Calculator. Plan shelving, hanging rods, and drawers by closet dimensions. Get a materials list.

Estimate closing costs when buying a home. Calculate lender fees, title insurance, taxes, and other settlement charges.

Free Clothing Size Converter for men and women. Convert shirt, pants, and dress sizes between US, UK, EU, Japan, and Australia sizing systems.

Calculate your Coast FIRE number — the amount you need saved now so compound growth covers retirement without additional savings.

Calculate the ideal coffee-to-water ratio for any brew method. Get precise measurements in grams and ounces.

Free College Cost Calculator to estimate total college costs with tuition inflation and calculate monthly savings needed to cover education expenses.

Free Color Converter tool to convert between HEX, RGB, HSL, HSV, and CMYK color formats instantly. Live color preview and copy-ready values for designers and developers.

Free combinations and permutations calculator. Calculate nCr and nPr with formula steps and factorials for probability and statistics.

Calculate sales commission earnings with base salary and tiered rates. See total earnings, effective commission rate, and take-home pay.

Calculate your monthly and annual commuting costs by car, public transit, or mixed transportation.

Free Completing the Square Calculator. Enter a, b, c for ax^2+bx+c and see the step-by-step transformation to vertex form.

Calculate the right carbon-to-nitrogen ratio for your compost pile. Balance greens and browns.

Calculate how much waste you can divert from landfills by composting. Estimate savings on garbage fees and garden supplies from home composting.

Free compound interest calculator with chart. Enter principal, rate, compounding frequency, and years to see how your money grows with the power of compounding.

Estimate your conception date from due date or last menstrual period. Find out when your baby was likely conceived.

Free Concrete Block Calculator to estimate blocks or bricks needed for a wall. Includes mortar joint thickness, waste factor, and cost estimation for construction projects.

Calculate concrete needed for slabs, columns, and steps. Get volume in cubic yards and meters plus estimated bags of 60lb or 80lb mix.

Free Concrete Column Load Capacity Calculator. Estimate the axial load capacity of reinforced concrete columns using the ACI simplified method.

Calculate concrete volume for slabs footings and columns. Get cubic yards bags needed cost and rebar spacing.

Calculate concrete volume needed for stairs. Enter dimensions to get cubic yards, bags, and cost.

Free cone calculator. Volume, surface area, lateral area, and slant height from radius and height.

Calculate the confidence interval from sample data. Find margin of error and CI bounds for means and proportions with this free statistics calculator.

Calculate how many units or pallets fit in a 20ft or 40ft shipping container for import/export planning.

Free Cookie Recipe Calculator. Scale a classic chocolate chip cookie recipe by the dozen. Get exact ingredient measurements.

Free cooking unit converter. Convert between cups, tablespoons, teaspoons, milliliters, liters, fluid ounces, pints, quarts, and gallons with ingredient weights.

Free corrected calcium calculator. Adjust total calcium for albumin level using the standard formula.

Calculate the Pearson correlation coefficient from paired data. Determine the strength and direction of the linear relationship between two variables.

Free Cosine Calculator. Compute cos(x) in degrees or radians. Shows exact values for common angles.

Compare cost of living between 20 major cities worldwide. See differences in housing, food, transport, utilities, and healthcare costs.

Calculate your customer acquisition cost (CPA/CAC) from ad spend and conversions. Optimize marketing spend with this free CPA calculator.

Live countdown timer to any date. See days hours minutes seconds remaining with presets for holidays.

Calculate countertop material needed in square feet. Estimate costs for granite, quartz, marble, and laminate.

Estimate kidney function using the Cockcroft-Gault equation for creatinine clearance (eGFR).

Free credit card payoff calculator. Enter your balance, APR, and payment to see months to payoff, total interest, and total cost.

Free Credit Score Estimator. Estimate your credit score range based on payment history, utilization, account age, and other factors.

Free crop yield calculator. Estimate harvest yield per acre from plant spacing and per-plant production.

Calculate fabric size, thread needed, and time estimate for cross stitch patterns.

Free Crown Molding Calculator. Calculate linear feet of crown molding needed and miter cut angles for any room shape.

Free crypto profit calculator to compute net profit or loss, ROI, and total fees from cryptocurrency trades. Enter buy/sell prices, coins, and fees instantly.

Free Crypto Tax Calculator to estimate US capital gains tax on Bitcoin, Ethereum, and other cryptocurrency. Short-term and long-term rates for 2025-2026.

Calculate cryptocurrency mining profitability. Enter hash rate, power consumption, and electricity cost to see daily/monthly profit.

Calculate volume in cubic feet from dimensions. Convert to cubic yards, cubic meters, gallons, and liters.

Calculate cubic yards from length, width, and depth. Convert between cubic yards, cubic feet, and cubic meters.

Calculate your overall GPA across multiple semesters. Combine previous GPA with current semester grades.

Free currency converter with 10 major currencies including USD, EUR, GBP, INR, JPY and more. View full cross-rate table and convert amounts instantly.

Free Currency Exchange Calculator with 30 major world currencies. Convert USD, EUR, GBP, JPY, INR, AUD, CAD, and more with approximate mid-market rates.

Calculate Customer Lifetime Value (CLV) from purchase frequency, average order value, and retention rate. Optimize your customer acquisition spend.

Estimate import duty costs by country and product category for international shipments.

Calculate calories burned cycling based on speed, duration, weight, and bike type. Accurate MET-based estimates.

Calculate gear ratios, gear inches, and development for any chainring and cog combination.

Free cylinder calculator. Volume, surface area, and lateral area from radius and height.

Calculate calories burned dancing by style, duration, and body weight.

Free data storage converter. Convert between bits, bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes instantly. Supports binary and decimal units.

Free date difference calculator. Find the exact number of days, weeks, months, and years between any two dates, including business days and total hours.

Free Daycare Cost Calculator. Estimate monthly and annual childcare costs by age, type of care, and location. Compare options.

Free days until calculator with live countdown. Find how many days until Christmas, New Year, Easter, Diwali, Eid, or any custom date you choose.

Estimate your deadlift one-rep max and training percentages from submaximal performance.

Free Debt Avalanche Calculator. Pay off debts by highest interest rate first to minimize total interest paid. See timeline and savings.

Free Debt Consolidation Calculator. Compare your debts to a consolidation loan. See monthly savings, total interest saved, and if consolidation makes sense.

Free debt payoff calculator with Avalanche and Snowball methods. Add multiple debts to see your payoff date, total interest, and schedule.

Free Debt Snowball Calculator. Enter your debts and see the payoff order (smallest balance first) with timeline and total interest.

Free debt-to-income ratio calculator. Calculate your front-end and back-end DTI ratios and see if you qualify for a mortgage or loan.

Free Decimal to Binary Converter. Enter a decimal number and see the binary equivalent with step-by-step division method.

Free Decimal to Fraction Converter. Enter a decimal number and get the simplified fraction. Works with terminating and repeating decimals.

Estimate decking materials including boards, joists, screws, and total board feet with waste factor and cost estimate.

Calculate how much oil you need for your deep fryer or pot. Find the right oil volume based on fryer dimensions and food displacement.

Compare DeFi farming APY vs APR. Calculate real yields with compounding frequency for liquidity pools and yield farms.

Calculate density from mass and volume (ρ = m/V). Find mass or volume when density is known.

Free depreciation calculator with straight-line, declining balance, double declining, and sum-of-years methods. View annual book value schedule.

Calculate the dew point temperature from air temperature and relative humidity.

Calculate the diagonal of a rectangle, square, or any regular polygon. Free online geometry calculator.

Estimate the total cost of diapers from birth to potty training. Compare budget vs premium brands and calculate monthly diaper expenses.

Free online dice roller for tabletop RPGs. Roll d4, d6, d8, d10, d12, d20, d100 with modifiers. Visual dice display, roll history, and multiple dice support.

Use the C1V1=C2V2 dilution equation to calculate concentrations and volumes for solution preparation.

Calculate DIM weight for shipping with UPS, FedEx, USPS, and other carriers to determine billable weight.

Calculate disability insurance coverage needed to replace your income during illness or injury.

Free Discount Calculator to find final price after discount, savings amount, or reverse-calculate original price. Supports double (stacked) discounts.

Calculate annual dividend income from your stock portfolio. Enter shares, price, and dividend per share to see yield and income.

Free Divisibility Calculator. Check if a number is divisible by 2-12 and any custom divisor. Shows which rules apply.

Free Division 296 tax calculator. Estimate the additional 15% tax on super earnings for Australian balances above .3M under proposed rules.

Accurately convert your dog age to human years using the modern breed-size formula. Small, medium, large, and giant breed calculations with life stage.

Calculate daily food portions for your dog based on weight, age, and activity level. Get accurate feeding recommendations.

Calculate annual dog food costs by breed size and food type. Compare dry kibble, wet, and premium brands.

Compare dollar cost averaging vs lump sum investing. See projected returns for both strategies.

Calculate observed frequency shift when a source and observer are in relative motion. Free physics tool.

Free dovetail joint calculator. Calculate spacing, pin and tail widths, and angles for dovetail joints.

Calculate your down payment goal, see how much you still need to save, and find out when you will reach your target. Free down payment savings planner.

Calculate the required drain pipe size based on the number and type of plumbing fixtures.

Calculate medication dosage based on patient weight. Enter dose per kg and weight for total dose.

Calculate drywall sheets needed for any room. Estimates joint tape, compound, screws for 4x8, 4x10, and 4x12 sheets.

Calculate HVAC duct dimensions based on CFM airflow requirements and maximum air velocity.

Free IVF Due Date Calculator. Estimate your due date from embryo transfer date and embryo age (Day 3 or Day 5 blastocyst). Includes trimester timeline.

Free pregnancy due date calculator using Naegele's Rule. Enter your last period or conception date to estimate your due date and trimester milestones.

Free Electric Bill Calculator. Estimate your monthly electricity costs from appliance usage, wattage, and hours of use per day.

Free EV Savings Calculator comparing electric vehicle costs to gasoline cars. Estimate fuel, maintenance, and total cost of ownership savings over time.

Calculate total electrical load for your home. Determine if your panel can handle existing and planned circuits.

Calculate electricity costs for appliances. Enter wattage, hours of use, and electricity rate to estimate daily, monthly, and yearly energy usage and costs.

Calculate the CO2 emissions from your electricity usage. Compare carbon footprints across different energy sources and US regions.

Calculate how much an appliance costs to run per day, month, and year based on wattage and electricity rate.

Calculate electricity consumption in kWh from wattage and usage hours. Estimate monthly electricity costs.

Free ellipse calculator. Area, perimeter, eccentricity, and foci from semi-major and semi-minor axes.

Calculate calories burned on an elliptical machine by resistance, duration, and body weight.

Calculate your ideal emergency fund target based on monthly expenses. See savings gap and time to reach your goal.

Free EMI calculator to estimate monthly loan payments. Enter loan amount, interest rate, and tenure to calculate EMI, total interest, and cost.

Calculate the true cost of an employee beyond salary. Includes benefits, taxes, overhead, and training costs.

Free energy unit converter. Convert between joules, calories, kilocalories, kilowatt-hours, BTU, electronvolts, and foot-pounds instantly.

Calculate engine displacement in CC and cubic inches from bore, stroke, and number of cylinders. Free engine size calculator for automotive enthusiasts.

Calculate the amount of resin and hardener needed for epoxy coating or casting projects.

Free Linear Equation Solver. Enter coefficients a, b, and c to solve ax + b = c. Shows step-by-step solution.

Free Equilateral Triangle Calculator. Enter the side length to find area, perimeter, height, inradius, and circumradius instantly.

Estimate federal estate tax exposure and understand exemption thresholds. Plan your estate effectively.

Free Estate Tax Calculator to estimate US federal estate tax liability. 2026 exemption amount, progressive tax brackets, and marital deduction included.

Calculate how long it takes to charge an electric vehicle by charger type. Level 1, Level 2, and DC fast charging estimates.

Plan your event budget with a detailed breakdown for venue, catering, entertainment, decorations, and more.

Free exponent calculator to compute powers (x^n) and nth roots. Shows results in standard and scientific notation for large numbers.

Calculate exposure value (EV) from ISO, aperture, and shutter speed. Master the exposure triangle for photography.

Calculate fabric yardage needed for sewing projects based on pattern pieces and fabric width.

Calculate the factorial of any number instantly. See the full multiplication chain and result.

Free Intermittent Fasting Calculator. Plan your fasting and eating windows for 16:8, 18:6, 20:4, OMAD, and 5:2 protocols with a live countdown timer and fasting stages.

Free online FD calculator to estimate your fixed deposit maturity amount and interest earned. Supports monthly, quarterly, half-yearly and annual compounding.

Estimate fencing materials and cost for wood, chain link, and vinyl fences. Calculate posts, rails, pickets, and concrete bags.

Free FHA loan calculator. Estimate your FHA mortgage payment including principal, interest, MIP, property taxes, and insurance with minimum 3.5% down payment.

Generate Fibonacci numbers, find the nth Fibonacci number, and check if a number is in the Fibonacci sequence.

Calculate filament needed for 3D prints based on print volume, infill percentage, and filament density.

Free FIRE calculator to find your Financial Independence number, years to FI, and projected FI date. Plan your path to early retirement with the 4% rule.

Calculate how much firewood you need for heating season based on home size, climate, and wood type.

Calculate how many fish your aquarium can hold based on tank size, filtration, and fish sizes. Avoid overstocking.

Find recommended fishing line weight and type based on target fish species and fishing method.

Calculate flash power at distance from guide number. Determine correct aperture for manual flash photography.

Estimate flight time between cities based on distance. Accounts for takeoff, landing, and average cruising speed.

Calculate flooring materials for hardwood, laminate, tile, vinyl, and carpet with waste factor and cost per square foot.

Convert focal length between sensor sizes using crop factor. Compare full-frame equivalent focal lengths.

Free NFL Passer Rating Calculator. Enter completions, attempts, yards, touchdowns, and interceptions to compute the official NFL passer rating.

Calculate force from mass and acceleration using Newton's Second Law. Free online physics calculator.

Calculate the value of a pip for any forex currency pair. Essential for position sizing and risk management.

Free fraction calculator to add, subtract, multiply, and divide fractions. Shows simplified results, decimal equivalents, and step-by-step solutions.

Free Fraction to Decimal Converter. Enter numerator and denominator to get the decimal equivalent. Detects repeating decimals.

Free frame rate converter. Calculate slow motion factor, playback duration, and frame counts between frame rates.

Free freelancer rate calculator to determine your ideal hourly rate, daily rate, and monthly revenue target based on income goals, expenses, and billable hours.

Calculate freezer cubic feet needed based on household size, shopping frequency, and food storage habits.

Estimate the NMFC freight class for LTL shipments based on density, handling, stowability, and liability.

Free frequency to musical note converter. Enter Hz to find the closest note name, octave, cents offset, and wavelength.

Calculate friction force from coefficient of friction and normal force (F = μN). Free physics calculator.

Free fuel cost calculator. Estimate gas cost for any trip. Enter distance, fuel efficiency (MPG or L/100km), and fuel price. Supports US and metric units.

Free fuel efficiency converter: convert between MPG (US), MPG (UK), L/100km, and km/L. Includes trip cost calculator for estimating fuel expenses.

Free future value calculator. Project how your investment will grow with initial deposit, periodic contributions, interest rate, and compounding frequency.

Determine the right garage door size and spring specifications for your garage opening.

Free Garage Storage Calculator. Plan shelving units and storage systems based on your garage dimensions and storage needs.

Free Gas Bill Calculator. Estimate monthly natural gas costs from therms usage for heating, water heating, and cooking.

Estimate Ethereum transaction gas fees in Gwei and USD. Calculate costs for transfers, swaps, and contract interactions.

Free gas mileage calculator. Track fuel efficiency with MPG, cost per mile, and L/100km. Log multiple fill-ups to monitor fuel economy.

Calculate gas pressure, volume, or temperature using the combined gas law and ideal gas law.

Plan your holiday and birthday gift budget by recipient, set spending limits, and track totals.

Free Glasgow Coma Scale (GCS) Calculator. Score eye, verbal, and motor responses to assess consciousness level. Used in emergency medicine.

Calculate golden hour and blue hour times based on your latitude and date. Plan perfect photography lighting.

Calculate your golf handicap index from recent scores using the WHS formula.

Free GPA calculator to compute your semester and cumulative grade point average. Add courses, credits, and letter grades to see your GPA instantly.

Free grade calculator: find what grade you need on your final exam, or calculate your weighted average from multiple assignments and their weights.

Free cumulative GPA calculator. Add courses with credit hours and grades. Supports US 4.0 scale.

Free Gratuity Calculator for India. Enter your last drawn basic salary and years of service to instantly calculate your gratuity amount and eligibility.

Calculate gravel needed for driveways, paths, and landscaping. Get volume in cubic yards and meters, weight in tons, and estimated cost by gravel type.

Find the GCD of two or more numbers using the Euclidean algorithm. Step-by-step GCD calculation.

Free Australian GST calculator. Instantly add or remove 10% GST from any amount. Calculate the GST component, pre-GST price or GST-inclusive total.

Free Canadian GST/HST/PST calculator. Calculate federal and provincial sales tax by province including GST, HST, PST and QST for all Canadian provinces.

Calculate New Zealand GST at 15%. Add GST to a price or remove GST from a GST-inclusive amount. Simple and instant.

Free GST Calculator for India. Instantly add or remove GST at 5%, 12%, 18%, or 28% rates. Calculate CGST, SGST, and total amount with one click online.

Calculate gutter and downspout sizes from roof area and local rainfall intensity. Prevent overflow and damage.

Free Halal mortgage calculator using the Murabaha model. Enter property value, deposit, profit rate, and term to calculate Sharia-compliant monthly payments.

Generate cryptographic hashes from text input. Supports multiple hash algorithms.

Free hay bale calculator. Estimate bales needed for winter feeding based on animal count, weight, and duration.

Free Health Insurance Calculator. Estimate ACA marketplace premiums based on age, income, location, and plan tier (Bronze/Silver/Gold/Platinum).

Free Heart Rate Zone Calculator using the Karvonen formula. Find your 5 training zones based on age, resting heart rate, and max heart rate for optimal workouts.

Calculate the heat index (feels like temperature) from air temperature and humidity.

Free HECS-HELP repayment calculator. Estimate your annual and monthly HELP debt repayments based on 2025-26 Australian income thresholds and rates.

Free HELOC calculator. Estimate your available credit line, interest-only and amortizing payments based on your home equity and balance.

Calculate HELOC monthly payments for draw period (interest-only) and repayment period. Free tool.

Free hex calculator: add, subtract, multiply, divide hexadecimal numbers and convert between hex, decimal, binary, and octal number systems.

Calculate the area, perimeter, diagonals, and apothem of a regular hexagon from side length.

Calculate calories burned hiking with elevation gain. Estimate energy expenditure by distance, pack weight, terrain, and body weight.

Free Home Energy Audit Calculator. Get an efficiency score and identify the biggest opportunities to reduce energy costs in your home.

Calculate your home equity from current market value and mortgage balance. See your equity percentage and potential HELOC borrowing power.

Free Home Insurance Calculator. Estimate your annual homeowners insurance premium based on home value, location, and coverage level.

Estimate horse weight from heart girth and body length measurements. Uses the standard equine weight estimation formula.

Calculate horsepower using torque and RPM, weight and quarter mile time, or voltage, amps, and efficiency. Convert between HP and kilowatts.

Convert hourly wage to annual salary and back. See daily, weekly, biweekly, monthly, and yearly pay based on your hours and rate.

Find out how much house you can afford using the 28/36 rule. Enter income, debts, and down payment to calculate your maximum home price.

Estimate house cleaning costs by home size, rooms, and cleaning type. Compare service pricing.

Free House Flipping Calculator. Analyze ARV, purchase price, rehab costs, holding costs, and projected profit for property flips.

Find out how much house you can afford using the 28/36 rule, debt-to-income ratios, and real-world budgeting. Includes a quick affordability estimate and links to free calculators.

Free HRA exemption calculator for salaried employees in India. Enter salary, HRA received and rent paid to find your tax-exempt House Rent Allowance amount.

Free hull speed calculator. Maximum displacement hull speed from waterline length.

Calculate relative humidity, absolute humidity, and vapor pressure from temperature and dew point.

Calculate the hypotenuse of a right triangle from two sides using the Pythagorean theorem. Free online math tool.

Free Ideal Body Weight Calculator using the Devine formula. Enter height and gender to find your ideal weight for medical dosing.

Solve PV=nRT for any variable — pressure, volume, moles, or temperature of an ideal gas.

Free ideal weight calculator using Hamwi, Devine, Robinson, and Miller formulas. Enter height and gender to find your ideal body weight.

Calculate your overall IELTS band score from individual section scores. See rounding rules and score interpretation.

Free image resolution calculator. Calculate print size from pixel dimensions and DPI, or find pixels needed for a target print size.

Calculate impermanent loss for liquidity pool positions. Compare holding vs providing liquidity for any price change.

Calculate Australian income tax using current ATO tax brackets in AUD. Includes Medicare levy.

Free Brazil Income Tax Calculator with IRPF progressive brackets in BRL for 2025. Calculate monthly and annual tax with deductions for dependents and INSS.

Free Canada Income Tax Calculator with all 13 provinces and territories. Federal plus provincial brackets, CPP, EI contributions. Updated for 2025 tax year.

Calculate Colombian income tax using 2026 brackets. Enter your gross income in COP (Colombian Pesos).

Calculate Egyptian income tax using 2026 progressive brackets. Enter your annual salary in EGP.

Calculate French income tax using current progressive brackets. Includes quotient familial system for household taxation.

Free Germany Income Tax Calculator with Einkommensteuer brackets, solidarity surcharge, and church tax for 2025. Calculate your net salary in euros instantly.

Calculate your Indian income tax for FY 2025-26 under Old and New tax regimes. Get slab-wise breakdown, cess, surcharge and effective tax rate instantly.

Calculate Indonesian income tax (PPh 21) using current DJP progressive brackets in IDR.

Calculate Italian personal income tax (IRPEF) using current progressive brackets in EUR.

Free Japan Income Tax Calculator with national income tax brackets, 10% resident tax, and social insurance. Calculate your net salary in yen for 2025.

Calculate Kenyan income tax (PAYE) using current KRA progressive brackets in KES.

Calculate Malaysian income tax using current LHDN progressive tax brackets in MYR.

Calculate Mexican income tax (ISR) using current SAT tax brackets in MXN. See effective rate and net income.

Calculate Dutch income tax using current Box 1 progressive brackets in EUR. Includes general tax credit.

Calculate Nigerian personal income tax using current FIRS progressive brackets in NGN.

Calculate Pakistani income tax using current FBR slab rates in PKR for salaried and non-salaried individuals.

Calculate Philippine income tax using current BIR progressive tax brackets in PHP.

Calculate Polish PIT income tax for 2026 using current tax brackets. Enter your gross income in PLN.

Free Singapore Income Tax Calculator with progressive tax brackets from 0% to 22% for 2025. Calculate tax-resident and non-resident tax with CPF contributions.

Free South Africa Income Tax Calculator with SARS tax brackets, primary/secondary/tertiary rebates for 2025/2026. Calculate PAYE and UIF deductions.

Calculate Spanish personal income tax (IRPF) using current progressive brackets in EUR.

Calculate Swedish income tax including municipal tax and state tax. Uses current brackets in SEK.

Calculate Thai personal income tax using current Revenue Department progressive brackets in THB.

Calculate Turkish income tax using 2026 brackets. Enter your gross income in TRY (Turkish Lira).

Free UAE Tax Calculator showing 0% personal income tax and 9% corporate tax. Understand UAE taxation, VAT, and employer obligations for 2025.

Free UK income tax calculator for 2025-26. Calculate income tax, National Insurance, and take-home pay for England, Wales, NI, and Scotland tax bands.

Calculate your 2025 federal income tax by bracket. Enter filing status, income, and deductions to see taxable income, effective rate, and after-tax pay.

Calculate Vietnamese Personal Income Tax (PIT) using 2026 progressive brackets in VND.

Free Inequality Solver. Solve linear inequalities of the form ax + b > c (or <, >=, <=). Shows steps and solution on a number line.

Free US inflation calculator. Enter an amount and date range to see how purchasing power has changed using historical CPI data from 1913 to 2025.

Free UK inheritance tax calculator. Estimate IHT liability including nil-rate band, residence nil-rate band, spouse exemption, taper relief, and gifts.

Estimate ink usage and cost based on the percentage of page coverage for your print jobs.

Calculate insulation needed for any area. Compare fiberglass, blown-in, spray foam, and rigid board with R-value targets.

Free Internet Speed Calculator to estimate download and upload times for any file size. Convert between Mbps, MBps, Gbps, and calculate transfer times.

Calculate how fast your inventory sells with the inventory turnover ratio. Measure days sales of inventory and optimize stock levels.

Free Inverse Trig Calculator. Compute arcsin, arccos, and arctan of any value. Results in degrees and radians.

Free investment calculator with inflation adjustment. Enter initial investment, monthly additions, and return rate to see real future value.

Create simple invoices with line items, tax, and discounts. Calculate totals instantly.

Free IP subnet calculator. Enter an IP address with CIDR notation to find network address, broadcast, usable host range, and wildcard mask.

Free IRA Calculator to project your Traditional or Roth IRA growth. See total contributions, earnings, and compare tax-deferred vs tax-free retirement savings.

Free IRR Calculator to compute internal rate of return and NPV for investment cash flows. Add yearly cash flows dynamically and get IRR using Newton's method.

Free irrigation calculator. Water volume needed for crop irrigation based on field size, crop needs, and rainfall.

Calculate IV drip rate in mL/hr and drops per minute. Essential for nursing and medical professionals.

Estimate jet lag recovery time based on time zones crossed and direction of travel. Get tips for faster adjustment.

Format, beautify, and validate JSON online. Paste your JSON to see it pretty-printed with syntax highlighting.

Calculate calories burned jumping rope by duration, intensity, and body weight. Compare jump rope to other cardio exercises.

Free Keto Macro Calculator. Calculate your daily fat, protein, and carb targets for a ketogenic diet using the standard 70/25/5 macro ratio based on your calorie needs.

Free kinetic energy calculator. KE = 1/2 mv^2 with unit conversions to kJ, calories, and kWh.

Free Kitchen Remodel Calculator. Budget your kitchen renovation by scope: cosmetic update, mid-range remodel, or luxury renovation.

Free Land Area Calculator for rectangles, triangles, circles and irregular plots. Convert between acres, hectares, square feet, square meters, bigha, marla, kanal, and more.

Calculate the true cost per load of laundry including water, electricity, detergent, and wear on clothing.

Free Law of Cosines Calculator. Find unknown sides or angles of any triangle using c\u00B2=a\u00B2+b\u00B2-2ab\u00B7cos(C).

Free Law of Sines Calculator. Solve triangles using a/sin(A)=b/sin(B)=c/sin(C). Find missing sides and angles.

Free Lawn Fertilizer Calculator to determine how much fertilizer to apply based on lawn size, NPK ratio, and desired nitrogen rate per 1,000 sq ft.

Calculate lawn mowing time and cost based on yard size, mower type, and service rates.

Calculate optimal layer height for your 3D printer nozzle size. Find the best balance of speed and quality.

Free LCM and GCF/GCD calculator. Find least common multiple, greatest common factor, and prime factorization for two or more numbers.

Free Lean Body Mass Calculator using Boer, James, and Hume formulas. Calculate your fat-free mass from height and weight to track fitness progress accurately.

Free lease calculator for auto and equipment leases. Calculate monthly payments, total cost, and interest from price, residual, and money factor.

Compare the total cost of leasing vs buying a vehicle over time. See which option saves more.

Find the LCM of two or more numbers. Uses GCD method for accurate least common multiple calculation.

Free LED resistor calculator. Find the correct current-limiting resistor for any LED circuit.

Free length converter: instantly convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, and nautical miles. Live results.

Calculate how much life insurance coverage you need based on income, debts, dependents, and future expenses.

Free light year converter. Convert between light years, kilometers, miles, astronomical units, and parsecs.

Free livestock feed calculator. Daily feed requirements by animal type, weight, and production stage.

Free online loan calculator to estimate monthly payments, total interest and total cost for personal loans. Includes a full amortization schedule breakdown.

Free logarithm calculator: compute log base 10, natural log (ln), log base 2, custom base logarithms, and antilog (inverse log) instantly.

Calculate logarithms with any base. Find log base 10, natural log (ln), log base 2, or any custom base.

Free love calculator to test compatibility between two names. Get a fun love compatibility percentage score. Entertainment only!

Calculate board feet of lumber from dimensions. Estimate cost for your woodworking project.

Free macro calculator for any diet. Enter your daily calories and goal to get exact protein, carb, and fat grams for Standard, Low-carb, High-protein, or Keto.

Calculate pace per mile or km for your target marathon or half-marathon finish time with split tables.

Free margin calculator to find profit margin, markup percentage, revenue, and cost. Three flexible modes for margin and markup analysis.

Calculate markup percentage, profit margin, and profit amount from cost and selling price. Understand the difference between markup and margin.

Calculate your weighted grade from assignments, tests, and exams. Find what you need on the final.

Free online matrix calculator. Add, subtract, multiply matrices. Find determinant, transpose, and inverse for 2x2, 3x3, or custom size matrices.

Calculate portions and containers needed for weekly meal prep. Plan meals by servings, calories, and containers.

Free MAP calculator. Mean arterial pressure from systolic and diastolic blood pressure.

Free mean, median, mode calculator. Enter a dataset to get mean, median, mode, range, variance, standard deviation, sum, count instantly.

Calculate cooking time and target internal temperature for any cut of meat by weight.

Free metronome calculator. Find beat durations, measure lengths, and subdivisions for any tempo and time signature.

Free miter angle calculator for woodworking. Calculate miter and bevel angles for polygon joints.

Calculate the modulo (remainder) of division. Supports positive and negative numbers with step-by-step explanation.

Calculate molar concentration (molarity) from moles of solute and volume of solution.

Calculate moles from mass and molecular weight, or find mass from moles. Free chemistry calculator.

Calculate molecular weight from a chemical formula by entering element counts.

Free momentum calculator. p=mv, impulse, and inelastic collision outcomes for two objects.

Free Australian mortgage calculator. Calculate weekly, fortnightly or monthly home loan repayments, total interest and total cost for Australian mortgages.

Free Canadian mortgage calculator with CMHC insurance premium calculation. Enter property value, down payment, amortization and rate to see monthly payments.

Free Irish mortgage calculator. Calculate monthly repayments total interest stamp duty and LTV ratio.

Free NZ mortgage calculator. Calculate fortnightly and monthly payments for New Zealand home loans.

Free UK mortgage calculator with SDLT stamp duty calculation. Enter property value, deposit, term and rate to instantly see monthly payments and total cost.

Free US mortgage calculator. Enter home price, down payment, term, and rate to calculate your monthly PITI payment, total interest, and payoff.

Free Mortgage Prepayment Penalty Calculator. Estimate the penalty for early mortgage payoff using IRD (Interest Rate Differential) or 3-month interest methods.

Calculate whether buying mortgage points to lower your interest rate is worth it. Break-even analysis.

Calculate how many moving boxes you need by room count and home size. Plan your move with accurate box estimates for every room.

Estimate moving costs based on distance home size number of movers and season. Get a detailed breakdown of labor truck packing and insurance costs.

Calculate how much mulch you need in cubic yards, cubic feet, and bags. Enter your garden area and depth to get accurate mulch and weight estimates instantly.

Free music key transposer. Transpose chords between any musical keys by semitones. Preserves chord qualities.

Free UK National Insurance calculator for 2025-26. Calculate NI contributions for employees and self-employed with annual, monthly, and weekly breakdowns.

Free nautical mile converter. Convert between nautical miles, statute miles, kilometers, meters, and feet.

Estimate take-home pay after federal tax, state tax, Social Security, and Medicare deductions.

Calculate your net worth by adding up assets and subtracting liabilities. Track cash, investments, real estate, and debts in one place.

Calculate profit from buying and selling NFTs including marketplace fees, royalties, and gas costs.

Calculate the Nisab threshold for Zakat using gold (85g) or silver (612g) standards. View Nisab value in USD, GBP, PKR, IDR, and BDT with this free calculator.

Free Noise Reduction Calculator. Calculate dB reduction from building materials and barriers. Compare STC ratings for walls, windows, and doors.

Free NPS Calculator to estimate your National Pension System corpus and monthly pension at retirement. Enter contribution, age, and return rate instantly.

Free number base converter. Convert between binary, octal, decimal, and hexadecimal number systems instantly. See conversions across all bases simultaneously.

Identify arithmetic and geometric sequences, find the nth term, and calculate the sum of a series.

Calculate the area, perimeter, and properties of a regular octagon from side length.

Free Ohm's Law calculator. Enter any two of voltage, current, resistance to solve for the third plus power.

Compare DIY vs shop oil change costs over time. Calculate annual savings and find the best oil change interval for your vehicle.

Free one rep max calculator using Epley, Brzycki, Lander, and Lombardi formulas. Enter weight and reps to estimate your 1RM with a full percentage table.

Calculate profit or loss on call and put options. Enter strike price, premium, and contract size for instant P&L.

Calculate your overtime pay instantly. Enter regular rate, hours, and overtime multiplier to see regular pay, overtime pay, and total earnings.

Check if an employee qualifies for FLSA overtime exemption based on salary and duties. Understand the 2024-2025 salary threshold for exempt status.

Free ovulation calculator to predict your fertile window and ovulation date. Enter your last period and cycle length to see your next 3 cycles' fertile days.

Free pace calculator for runners and walkers. Find your pace, finish time, or distance. Includes presets for 5K, 10K, Half Marathon, and Marathon distances.

Calculate how many gallons of paint you need for any room. Enter dimensions, doors, and windows to get accurate paint estimates for 1 or 2 coats.

Estimate paint drying and curing times based on paint type, temperature, and humidity.

Calculate how many gallons of paint you need based on room dimensions, doors, and windows.

Free Painting Cost Calculator. Estimate interior or exterior painting costs by square footage, including labor and materials.

Calculate how many boxes fit on a pallet by entering box and pallet dimensions for optimal stacking.

Free Pancake Calculator. Scale a pancake recipe to any number of servings. Get exact ingredient amounts for perfect pancakes every time.

Free parallelogram calculator. Area, perimeter, diagonals, and height from sides and included angle.

Calculate how much food to prepare per guest for parties and events. Estimate appetizers, mains, sides, desserts, and drinks.

Free password generator. Create strong random passwords with custom length, character types, and strength meter. Generate multiple passwords at once.

Calculate the right amount of dry pasta per serving by type. Convert between servings and ounces for spaghetti, penne, macaroni, and more.

Calculate how many pavers you need for a patio, walkway, or driveway. Includes waste factor and base material estimates.

Calculate the impact of a pay raise on your salary. See new annual salary monthly increase hourly rate change and compare old vs new with a visual chart.

Free US paycheck calculator. Estimate federal tax, state tax, Social Security, Medicare, and take-home pay from your gross pay and filing status.

Free NZ PAYE calculator. Calculate income tax KiwiSaver ACC levy student loan and take-home pay.

Free pediatric weight estimator from age using APLS, Luscombe-Owens, and Best Guess formulas.

Calculate pendulum period, frequency, and length using T = 2π√(L/g). Free physics calculator.

Free pension calculator for Defined Benefit and Defined Contribution plans. Estimate annual and monthly pension income based on salary and service.

Calculate how long your UK pension pot will last under drawdown. Model different withdrawal rates and investment returns.

Calculate the area, perimeter, and diagonals of a regular pentagon from side length.

Calculate the percent composition of each element in a chemical compound by mass. Free chemistry tool.

Free percentage calculator: find what percent of a number is, what percentage one number is of another, and percentage change between two values.

Free percentage change calculator. Three modes: find X% of Y, what % X is of Y, and percentage change from X to Y.

Free Perimeter Calculator for rectangles, triangles, circles, and more. Select a shape, enter dimensions, and get the perimeter instantly.

Free period calculator to predict your next 6 period dates and fertile windows. Enter last period date and cycle length for accurate results.

Free permutation and combination calculator. Compute nPr and nCr with step-by-step formulas. Find how many ways to arrange or choose items.

Free personal loan calculator with origination fee. Calculate monthly payments, total interest, total cost including fees, and payoff date.

Estimate pest control treatment costs by home size, pest type, and treatment frequency.

Calculate daily food portions for your dog or cat based on weight, age, and activity level.

Free Pet Insurance Calculator. Estimate monthly pet insurance costs by species, age, and breed size. Compare coverage options.

Calculate pet drug dosages by body weight. Accurate medication doses for dogs and cats based on veterinary guidelines.

Calculate pH from hydrogen ion concentration or convert between pH, pOH, [H+], and [OH-].

Free Depth of Field Calculator for photographers. Calculate DoF, hyperfocal distance, near and far focus limits based on focal length, aperture, and subject distance.

Calculate water flow rate through pipes using pipe diameter, length, and pressure differential.

Free pixel to em converter: convert between px, em, rem, pt, vw, and vh CSS units. Set your base font size for accurate conversions.

Free Pizza Dough Calculator with exact flour, water, salt, yeast, and oil amounts by pizza count, size, and hydration. Neapolitan, New York, and Detroit presets.

Free planet weight calculator. Find your weight on all planets, the Moon, and the Sun using surface gravity ratios.

Track your plank hold time and get a fitness rating. Calculate a progressive plank training plan based on your current ability.

Calculate how many plants fit in your garden based on spacing requirements and bed dimensions.

Free plywood calculator. Find sheets needed for a project with waste factor and cost estimation.

Free Polynomial Calculator. Enter coefficients and a value of x to evaluate any polynomial. Shows the computation step by step.

Calculate pool water volume in gallons and liters for rectangular, circular, oval, and kidney-shaped pools with fill time and chemical dosing.

Estimate USPS shipping costs by weight, dimensions, and service type. Calculate postage for letters, packages, and flat rate options.

Find the optimal poster size based on viewing distance and content type for maximum impact and readability.

Free gravitational potential energy calculator. PE = mgh with equivalent fall speed.

Free power factor calculator. Calculate real, apparent, and reactive power from voltage, current, and power factor.

Calculate power from work and time (P = W/t). Convert between watts, horsepower, and BTU/hr.

Free PPF calculator to estimate your Public Provident Fund maturity value. Enter annual investment, duration and interest rate to see year-by-year growth.

Free pregnancy calculator to track your current week, trimester, days remaining, and key milestones from heartbeat to due date. Enter your LMP or due date.

Free pregnancy weight gain calculator based on IOM guidelines. See recommended gain by BMI category with a week-by-week trajectory chart.

Free present value calculator. Determine how much a future sum is worth today based on interest rate, number of periods, and compounding frequency.

Free pressure unit converter. Convert between PSI, bar, atm, kPa, mmHg, inHg, Pa, and torr instantly with accurate results.

Calculate the right price for your product from cost and desired profit margin. Find markup percentage, selling price, and profit per unit.

Free Prime Factorization Calculator. Factor any number into its prime components. Shows the complete factorization tree.

Free prime number calculator. Check if a number is prime, find prime factorization, and list all primes up to N.

Calculate total cost per 3D print including material, electricity, wear, and time. Price your prints accurately.

Calculate the cost per page for home or office printing including ink, paper, and electricity costs.

Calculate minimum image resolution needed for quality prints at any size. DPI requirements for photography and design.

Estimate 3D print time from model dimensions, layer height, and print speed. Plan your prints accurately.

Free probability calculator for single and multiple events, combinations C(n,r), and permutations P(n,r). Results shown as fractions, decimals, and percentages.

Calculate gross profit margin, operating margin, and net profit margin. Essential for business owners and investors.

Free projectile motion calculator. Range, max height, time of flight from launch angle and velocity.

Estimate your homes future value with annual appreciation rates. Project property value growth over 5, 10, 20, or 30 years.

Free Property Tax Calculator to estimate annual property tax by US state. Pre-filled average tax rates for all 50 states. Enter home value and get instant results.

Free protein calculator to find your daily protein needs based on weight, activity level, and fitness goals. Get per-meal breakdowns and food equivalents.

Track your push-ups and estimate calories burned. Calculate your push-up fitness level by age and gender with this free calculator.

Free pyramid calculator. Volume and surface area for square and triangular base pyramids.

Free Pythagorean theorem calculator: enter any two sides of a right triangle to find the missing side, area, perimeter, and angles with a visual diagram.

Free quadratic formula calculator. Enter a, b, c coefficients to find roots, discriminant, vertex, and step-by-step solution for any quadratic equation.

Calculate the BTU output needed for radiators to heat a room based on room dimensions and insulation quality.

Calculate rainwater collection potential based on roof area and rainfall. See annual collection monthly breakdown household supply days and tank size.

Calculate rainfall volume in gallons from area and rainfall depth. Useful for gardening and rainwater harvesting.

Calculate exactly how much soil mix you need for raised garden beds of any size.

Free random number generator with custom range, count, integer/decimal mode. Includes dice roller (d4-d20) with visuals and animated coin flipper.

Free ratio calculator to simplify ratios, find equivalent ratios, scale proportionally, and check if two ratios are proportional. Instant live results.

Free RD calculator to estimate your recurring deposit maturity value, total deposits, and interest earned with quarterly compounding.

Calculate Flesch-Kincaid grade level and reading ease score for any text. Free readability tool.

Calculate rebar needed for concrete slabs, footings, and walls. Get total linear feet, weight, and count.

Free Recipe Scaler Calculator to adjust recipe ingredient amounts when changing serving sizes. Scale up for parties or down for fewer people instantly.

Calculate the environmental impact of your recycling habits. See how much CO2, water, and energy you save by recycling different materials.

Calculate your potential savings from refinancing. Compare current vs new mortgage payments, see monthly savings, break-even months, and total interest saved.

Test regular expressions against text in real time. See matches highlighted with capture groups.

Calculate simple linear regression with slope, intercept, and R-squared. Fit a line to your data and make predictions with this free calculator.

Free regular polygon calculator. Area, perimeter, interior angles, and apothem for any n-sided polygon.

Estimate house flip renovation costs room by room. Calculate rehab budget for fix-and-flip investment properties with this free tool.

Free Rent Affordability Calculator. Calculate the maximum rent you can afford based on income, debts, and the 30% rule.

Compare the total cost of renting vs buying a home over 5 and 10 years. See monthly costs, break-even year, and which option saves you more money over time.

Free rental property calculator. Estimate cap rate, cash-on-cash return, monthly cash flow, and net operating income for any property.

Calculate gross and net rental yield on investment property. Compare returns to help make smarter property investment decisions.

Free Renters Insurance Calculator. Estimate your renters insurance premium based on coverage amount, location, and deductible.

Calculate your required minimum distribution from IRA or 401k based on age and account balance.

Calculate resin volume needed for SLA/DLP 3D printing. Estimate resin usage and cost per print.

Free resistor color code calculator. Decode 4 and 5 band resistor values from color bands with tolerance.

Calculate retaining wall materials: blocks, cap stones, adhesive, backfill gravel, and filter fabric needed.

Free Retirement Age Calculator to project when you can retire based on current savings, contributions, expected returns, and desired retirement income.

Free Retirement Calculator to project your nest egg, estimate how long savings will last, and see if you are on track. Plan your retirement with confidence.

Calculate the area and perimeter of a rhombus from its diagonals or side length and angle.

Free Rice Calculator. Get the perfect rice-to-water ratio for white, brown, basmati, jasmine, and sushi rice. Servings and cooking time.

Free Right Triangle Calculator. Enter any two sides to find the third side, area, perimeter, and all angles using the Pythagorean theorem.

Free Ring Size Converter between US, UK, EU, Japan, China systems plus circumference and diameter in mm. Find your perfect ring size instantly.

Estimate fuel costs for a road trip based on distance, MPG, and gas price. Plan stops and budget for your journey.

Free ROI calculator to compute return on investment, annualized ROI, and profit or loss. Enter initial and final values for instant results.

Convert between Roman numerals and decimal numbers instantly. Supports numbers from 1 to 3,999,999.

Free Roof Replacement Cost Calculator. Estimate costs by square footage and roofing material including asphalt, metal, tile, and slate.

Free roofing calculator. Estimate squares, bundles of shingles, and costs. Enter roof dimensions, pitch, and waste factor for accurate results.

Calculate the tax impact of converting a Traditional IRA to Roth IRA. Compare future values with and without conversion.

Calculate calories burned rowing by pace, duration, and body weight. Estimate rowing machine workout intensity and energy expenditure.

Estimate how long it takes to double your money at a given interest rate using the Rule of 72.

Calculate calories burned while running based on distance, pace, weight, and terrain. Uses MET-based formula for accurate results.

Calculate your running pace, finish time, or distance from any two of the three values.

Calculate monthly payments and total cost for RV financing. Compare RV loan terms and rates.

Calculate how much you can safely withdraw from your retirement portfolio annually using the SWR method.

Free US salary calculator. Enter your gross salary, filing status, and state to estimate federal tax, state tax, FICA, and take-home pay for 2026.

Calculate sales tax for any US state. Enter purchase amount and state to see tax and total. Includes reverse calculation from total paid.

Calculate the required sample size for surveys and research. Determine how many responses you need for statistically significant results.

Calculate sand needed in cubic yards, tons, and bags for your project.

Estimate your SAT score from practice test raw scores. Convert reading, writing, and math sections to scaled scores.

Free savings calculator to estimate how your savings grow. Enter initial deposit, monthly contributions, rate, and years to see your balance.

Free Savings Goal Calculator to find how much to save monthly to reach your financial goal by a target date. Accounts for interest and existing savings.

Calculate interest earned on savings deposits at HYSA rates with monthly contributions.

Estimate back-to-school supply costs by grade level. Budget for notebooks, pencils, backpacks, and more with this free calculator.

Free online scientific calculator with trigonometry, logarithms, exponents, square roots, and more. Full button interface with calculation history.

Free scientific notation calculator. Convert numbers to and from scientific notation, perform arithmetic operations, and see step-by-step conversions.

Free Screen Size Calculator to convert diagonal screen size to width and height dimensions. Calculate PPI (pixels per inch) for any display resolution and aspect ratio.

Calculate how many tables you need for your event based on guest count and table size.

Free sector area calculator. Area and perimeter of a circular sector from radius and central angle.

Calculate when to start seeds indoors based on your last frost date and crop type.

Calculate your 2025 self-employment tax including Social Security, Medicare, and additional Medicare tax. See your deductible half and net impact.

Calculate your semester GPA from course grades and credit hours. Supports A-F grading scale.

Calculate septic tank size based on bedrooms, occupants, and water usage. Get pump-out schedule recommendations.

Estimate your severance package based on years of service, salary, and industry standards. Calculate typical severance for layoffs and terminations.

Free International Shoe Size Converter for men and women. Convert between US, UK, EU, Japan, China, Korea, Brazil, and Australia shoe sizes instantly.

Free Shoe Size Converter. Convert between US Men's, US Women's, UK, EU, and CM shoe sizes instantly. Clean table display with all international size systems.

Free shutter speed calculator. Find shutter speed from ISO, aperture, and EV using the exposure triangle formula.

Free simple interest calculator using the formula I = P x R x T. Enter principal, rate, and time to instantly calculate interest earned and total amount.

Free Simultaneous Equation Solver. Solve two linear equations with two unknowns using Cramer's rule. Shows step-by-step solution.

Free Sine Calculator. Compute sin(x) in degrees or radians. Shows exact values for common angles.

Free SIP Calculator to estimate your mutual fund returns. Enter monthly investment, expected return rate, and period to calculate future value instantly.

Calculate calories burned skiing or snowboarding by type, intensity, and duration.

Free sleep calculator based on 90-minute sleep cycles. Enter your wake-up time or bedtime to find the best times for 4-6 complete sleep cycles and better rest.

Free slope calculator: enter two points to find slope, y-intercept, line equation (y=mx+b), distance between points, and midpoint with a visual graph.

Calculate calories, protein, carbs, and fat for custom smoothie recipes. Build healthy smoothies with accurate macros.

Estimate snow plowing and removal costs by driveway size and snowfall amount.

Calculate how much salt or deicer you need and estimate plow time. Plan snow removal for driveways, parking lots, and sidewalks.

Free Soccer Field Calculator. Calculate field dimensions, area, and perimeter for regulation and youth soccer fields.

Calculate soccer pass accuracy, shots on target percentage, and key performance metrics.

Calculate the return on investment from your social media marketing. Measure ROI from ad spend, content costs, and revenue generated.

Find the optimal age to claim Social Security by comparing cumulative benefits at age 62, 67, and 70.

Estimate your Social Security retirement benefits at ages 62, 67, and 70. Free simplified calculator using SSA replacement rate approach.

Free Soil Calculator to find how much soil you need for raised beds and garden plots. Calculates volume in cubic feet, cubic yards, and number of bags needed.

Calculate battery bank size for off-grid solar systems. Determine capacity needed for days of autonomy.

Estimate solar panel system size, annual production, savings, and payback period based on your electricity usage and location.

Free Solar Savings Calculator. Estimate monthly savings from solar panels based on electricity usage, sun hours, and local rates.

Calculate combined decibel levels, distance attenuation, and compare sound intensities. Free acoustics tool.

Calculate starter, flour, water, and salt amounts for sourdough bread. Adjust hydration and recipe size.

Free speed converter: instantly convert between km/h, mph, m/s, knots, and ft/s. All units update live as you type. Accurate conversion formulas.

Free Speed Distance Time Calculator. Enter any two values to calculate the third. Supports mph, km/h, miles, kilometers, and multiple time formats.

Free sphere calculator. Volume, surface area, diameter, and circumference from radius.

Convert between fresh and dried herbs. Ratios for common spices and herbs used in cooking.

Calculate spring constant from Hooke's Law (F = kx). Find force, displacement, or spring constant.

Calculate square footage for rectangle, L-shape, triangle, and circle rooms. Add multiple rooms, get total sq ft and sq meters. Free and easy to use.

Free square root calculator. Find square roots, cube roots, and nth roots of any number. Check if a number is a perfect square instantly.

Estimate your squat one-rep max from weight and reps. See training percentages for your program.

Calculate calories burned climbing stairs based on flights, body weight, and pace.

Design staircase dimensions with proper riser height, tread depth, stringer length, and building code compliance check.

Calculate cryptocurrency staking returns over time. Estimate rewards for ETH, SOL, ADA, and other PoS tokens.

Free Australian stamp duty calculator. Calculate transfer duty for NSW, VIC, QLD, SA, WA, TAS, NT and ACT including first home buyer concessions and exemptions.

Free Indian stamp duty calculator by state. Calculate stamp duty and registration charges for all major states.

Free Irish stamp duty calculator. Calculate stamp duty for residential and non-residential property.

Free UK stamp duty calculator for England, Scotland, and Wales. Calculate SDLT, LBTT, or LTT for first-time buyers, next homes, and additional properties.

Free standard deviation calculator. Enter your data set to find mean, median, mode, variance, standard deviation (population and sample), range, and more.

Estimate total startup costs including legal, equipment, marketing, inventory, and operating expenses.

Free stock return calculator to compute total return, percentage gain, and annualized returns with dividends. Enter buy and sell prices instantly.

Calculate your shares and cost basis after a stock split or reverse split. Supports any split ratio.

Calculate reactant and product amounts using mole ratios from balanced chemical equations. Free chemistry tool.

Find the right storage unit size for your belongings. Calculate needed space by room contents, furniture count, and box volume.

Free student loan calculator. Enter loan balance, interest rate, and term to calculate monthly payments, total interest, and amortization schedule.

Track and total your monthly subscriptions to see how much you really spend on recurring services.

Free sunrise and sunset calculator. Estimate day length, sunrise, and sunset times from latitude and date.

Free Australian superannuation calculator. Project your super balance at retirement with employer contributions, voluntary contributions and investment returns.

Calculate the surface area, volume, and circumference of a sphere from its radius. Free geometry tool.

Calculate calories burned swimming by stroke type, duration, and intensity. Covers freestyle, backstroke, breaststroke, and butterfly.

Calculate swimming pace per 100m or 100 yards. Convert between distances and estimate race times.

Calculate the Student t-test statistic and p-value. Perform one-sample and two-sample t-tests with this free online statistics calculator.

Free Tangent Calculator. Compute tan(x) in degrees or radians. Shows undefined values at asymptotes.

Free target heart rate calculator with Karvonen method support. Enter your age and resting heart rate to find your max HR and five training heart rate zones.

Calculate the tax-equivalent yield of municipal bonds. Compare tax-free yields to taxable investments based on your tax bracket.

Estimate your federal tax refund or amount owed based on income, withholding, and deductions.

Free TDEE calculator using Mifflin-St Jeor. Calculate your total daily energy expenditure, see TDEE at every activity level, and get macronutrient suggestions.

Free telescope magnification calculator. Find magnification, exit pupil, and useful magnification range.

Free temperature converter: instantly convert between Celsius, Fahrenheit, and Kelvin. All three scales update live as you type. Accurate formulas included.

Free Tennis Serve Speed Calculator. Estimate serve speed from court distance and time. Understand serve speed ranges for different levels.

Convert text between uppercase, lowercase, title case, sentence case, camelCase, snake_case, and kebab-case.

Free tile calculator. Find how many tiles and boxes you need for floors or walls. Supports common sizes, custom dimensions, and waste factor.

Calculate how much grout you need based on tile size, joint width, and area to cover.

Free time calculator. Add or subtract hours, minutes, and seconds. Convert between decimal hours and h:m:s format. Perfect for timesheets and scheduling.

Calculate weekly work hours and pay from clock-in/clock-out times. Track overtime and total earnings.

Calculate the exact duration between two times in hours minutes seconds and decimal hours. Supports overnight calculations and add subtract time.

Free time zone converter: select two cities from 30+ worldwide and see current times, UTC offsets, and time difference. Accounts for daylight saving time.

Free Tip Calculator to find tip amount, total bill, and per-person split. Preset tip buttons for 10%, 15%, 18%, 20%, 25% or enter a custom percentage.

Get country-specific tipping etiquette with recommended tip amounts for restaurants, hotels, and services.

Find the recommended tire pressure by vehicle load and ambient temperature. Understand PSI adjustments for cold weather and heavy loads.

Free tire size calculator. Compare two tire sizes side by side for diameter, width, circumference, revolutions per mile, and speedometer difference.

Check if your vehicle can safely tow a trailer, boat, or RV. Calculate towing margins, tongue weight, and payload capacity requirements.

Free Track Pace Calculator. Calculate split times for track events from 100m to 10,000m. Enter goal time and get per-lap splits.

Calculate transformer turns ratio, secondary voltage, and current from primary specifications.

Free trapezoid calculator. Area, perimeter, and height of a trapezoid from parallel sides and height.

Estimate travel costs for your trip. Budget for flights, accommodation, food, activities, and transportation.

Free Travel Insurance Calculator. Estimate travel insurance costs based on trip cost, duration, age, and destination.

Calculate how much CO2 trees absorb over time. Estimate the carbon offset from planting trees based on species and growing conditions.

Free Tree Removal Cost Calculator. Estimate tree removal costs by height, diameter, and location. Includes stump grinding options.

Free triangle calculator: enter any 3 known values (sides or angles) and find all sides, angles, area, and perimeter. Supports SSS, SAS, ASA, AAS, SSA.

Free Turkey Cooking Time Calculator. Enter turkey weight to get cooking time and temperature. Covers unstuffed and stuffed turkeys.

Free Typing Speed Calculator to measure your words per minute (WPM), accuracy, and characters per minute. Take a timed typing test and track your progress.

Calculate recommended umbrella insurance policy coverage based on your net worth and risk exposure.

Find sine, cosine, tangent, and coordinates for any angle on the unit circle. Supports degrees and radians.

Convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds with timezone display.

Encode text for safe use in URLs or decode URL-encoded strings back to readable text.

Calculate VA mortgage payments with no down payment and no PMI. Includes VA funding fee calculation.

Free global VAT calculator. Add or remove VAT/GST for 18+ countries including UK, Germany, France, Japan, Australia and more with pre-filled country rates.

Free video file size estimator. Calculate file size from bitrate, duration, and audio for any video format.

Free VO2 Max Calculator with Cooper 12-minute test, 1.5-mile run, and Rockport walk test. Estimate your maximum oxygen uptake and cardiovascular fitness level.

Free Volume Calculator for cubes, spheres, cylinders, cones, and rectangular prisms. Select a shape, enter dimensions, and get volume instantly.

Free volume converter: convert between mL, liters, US cups, pints, quarts, gallons, fluid ounces, and UK measures. Cooking mode for tablespoons and teaspoons.

Calculate the volume, slant height, lateral and total surface area of a cone from radius and height.

Calculate the volume, surface area, and space diagonal of a cube from its side length. Free geometry calculator.

Calculate the volume, lateral surface area, and total surface area of a cylinder from radius and height.

Free Waist-to-Hip Ratio (WHR) Calculator. Measure your waist and hip circumference to assess health risk categories for heart disease and metabolic conditions.

Free Walking Calorie Calculator using MET values. Estimate calories burned walking based on your weight, speed, duration, and incline for accurate fitness tracking.

Calculate wallpaper rolls needed for any room. Accounts for doors, windows, roll size, and pattern repeat waste.

Free Water Bill Calculator. Estimate monthly water costs from usage patterns including showers, laundry, irrigation, and daily use.

Calculate your personal water footprint from diet and lifestyle choices. See how much water your food, showers, and daily habits consume.

Free Water Heater Calculator to determine the right tank size and flow rate based on household size, fixtures, and hot water usage patterns.

Free water intake calculator to estimate your daily hydration needs based on weight, activity level, and climate. Results in ml, liters, cups, and fluid ounces.

Calculate water pressure (PSI) from elevation head and estimate pressure loss through pipes.

Calculate how much water your garden needs based on plant type, weather, and soil conditions.

Free wave calculator. Find wavelength, frequency, speed, period using v = f x lambda.

Plan your wedding budget with automatic allocation by category. Set your total budget and guest count to see venue, catering, photography costs and more.

Free Wedding Cake Calculator. Estimate servings from tiered wedding cakes by tier sizes. Plan the perfect cake for your guest count.

Free Wedding Flower Calculator. Estimate flower arrangement needs and costs for bouquets, centerpieces, and ceremony decorations.

Estimate how many guests will actually attend your wedding based on invitations sent, relationship closeness, and distance factors.

Free Wedding Invitation Calculator. Calculate cards needed, postage costs, and envelope quantities for your wedding invitations.

Free Wedding Photography Calculator. Estimate photography costs by hours, coverage type, and package tier.

Free Wedding Seating Calculator. Determine how many tables you need based on guest count and table shape/size.

Free weight converter: convert between milligrams, grams, kilograms, metric tons, ounces, pounds, stones, and US tons. All units update live as you type.

Free Wilks Score Calculator for powerlifting. Compare strength across weight classes using the official Wilks coefficient formula.

Calculate wind chill temperature using the NWS formula. Enter air temperature and wind speed to find wind chill index, frostbite risk time, and danger level.

Free Wind Load Calculator. Calculate wind force on structures using the simplified wind load formula. Enter speed, area, and drag coefficient.

Calculate blind measurements for inside and outside mount installations. Get the right size for your windows.

Calculate the correct wire gauge for electrical circuits. Based on amperage, distance, and voltage drop limits.

Estimate your federal income tax withholding per paycheck for 2025. Enter salary, pay frequency, and filing status to see withholding amounts.

Free wood shrinkage calculator. Estimate dimensional changes from moisture content using shrinkage coefficients.

Free word counter. Count words characters sentences paragraphs reading time and Flesch-Kincaid readability.

Calculate work done from force and distance (W = Fd). Free physics calculator with kinetic energy computation.

Estimate workers compensation insurance premiums for your business. Calculate rates based on payroll, classification codes, and experience modifier.

Free working days calculator. Count business days between two dates excluding weekends and public holidays for the US, UK, India, Australia, and Canada.

Calculate yarn yardage needed for knitting and crochet projects by weight and gauge.

Calculate calories burned during yoga sessions by style, duration, and body weight.

Calculate z-score from a value, mean, and standard deviation. See the corresponding percentile.

Calculate Zakat al-Fitr (Fitrana) per person and for your entire family. Select your country to see approximate amounts in local currency with this free tool.

Free Zakat calculator to determine your annual Zakat obligation. Enter your assets and liabilities to check Nisab threshold and calculate 2.5% Zakat due.

Free Zakat on gold calculator. Enter gold weight, karat, and unit to check Nisab eligibility and calculate 2.5% Zakat due on your gold holdings instantly.