Chemistry Calculators
Chemistry involves precise measurements and calculations at the molecular level. Our 10 chemistry calculators help students, lab technicians, and researchers work through common chemistry problems quickly and accurately. Calculate solution concentrations with the molarity calculator, plan dilutions, determine pH values, find molecular weights, apply the ideal gas law, convert between moles and grams, analyze percent composition, balance stoichiometry, work with gas pressures, and estimate boiling point changes. All tools are free and use standard chemistry formulas.
Solutions & Concentrations
Molarity, dilution, pH, and percent composition tools.
Molarity Calculator
Calculate solution concentration in moles per liter.
Dilution Calculator
Use C1V1 = C2V2 to plan serial or simple dilutions.
pH Calculator
Convert between pH, pOH, [H+], and [OH-] values.
Percent Composition Calculator
Find the mass percentage of each element in a compound.
Moles & Stoichiometry
Mole conversions, molecular weight, and reaction stoichiometry.
Molecular Weight Calculator
Calculate molar mass from a chemical formula.
Mole Calculator
Convert between moles, grams, and number of particles.
Stoichiometry Calculator
Calculate reactant and product amounts in chemical reactions.
Gases & Physical Properties
Ideal gas law, gas pressure, and boiling point calculations.
Frequently Asked Questions
How do I calculate molarity of a solution?
Molarity (M) is the number of moles of solute per liter of solution: M = moles / liters. To find it, divide the mass of solute by its molar mass to get moles, then divide by the solution volume in liters. Our molarity calculator handles these steps for you — enter mass, molar mass, and volume to get the concentration instantly.
How does the dilution equation work?
The dilution equation is C1V1 = C2V2, where C1 and V1 are the initial concentration and volume, and C2 and V2 are the final concentration and volume. If you know any three values, you can solve for the fourth. Our dilution calculator lets you find the volume of stock solution needed or the final concentration after dilution.
What is pH and how is it calculated?
pH is the negative logarithm (base 10) of the hydrogen ion concentration: pH = -log[H+]. A pH of 7 is neutral, below 7 is acidic, and above 7 is basic. Our pH calculator converts between pH, pOH, [H+], and [OH-] concentrations, making it easy to work with acid-base chemistry problems.
How do I use the ideal gas law?
The ideal gas law is PV = nRT, where P is pressure, V is volume, n is moles of gas, R is the gas constant, and T is temperature in Kelvin. If you know any three variables, you can solve for the fourth. Our ideal gas calculator supports multiple units for pressure and volume and converts temperature automatically.