How to Calculate Calories Burned During Exercise

Updated March 2026 · 11 min read

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How Calorie Burn Calculation Works

Calories burned during exercise are calculated using MET values (Metabolic Equivalents of Task), a standardized system that expresses the energy cost of physical activities as multiples of your resting metabolic rate. One MET equals the amount of oxygen your body consumes while sitting quietly—approximately 3.5 mL of oxygen per kilogram of body weight per minute.

The MET system was developed from research by Dr. Barbara Ainsworth and colleagues and is maintained in the Compendium of Physical Activities at Arizona State University. It catalogs MET values for over 800 specific activities, from sleeping (0.95 METs) to competitive running at 10 mph (14.5 METs). The Compendium is widely used by exercise physiologists, nutritionists, and health researchers worldwide.

According to the Centers for Disease Control and Prevention (CDC), adults should aim for at least 150 minutes of moderate-intensity activity (3.0–5.9 METs) or 75 minutes of vigorous-intensity activity (6.0+ METs) per week. Understanding MET values helps you track whether your exercise routine meets these guidelines and estimate your total calorie expenditure for weight management.

The Calorie Burn Formula

The standard formula for estimating calories burned during any physical activity is:

Calories Burned = MET × Weight (kg) × Duration (hours)

Where:

MET — The Metabolic Equivalent value for the specific activity (from the Compendium of Physical Activities)
Weight — Your body weight in kilograms (divide pounds by 2.205)
Duration — Time spent performing the activity in hours (divide minutes by 60)

This formula is derived from the fact that 1 MET equals approximately 1 kcal per kilogram per hour. It provides a reasonable estimate for most people, though individual variation of 10–20% is common.

Worked Example: Running

Activity: Running at 6 mph (10-min mile pace)

MET value: 9.8

Weight: 155 lbs = 70.3 kg

Duration: 30 minutes = 0.5 hours

Calories = 9.8 × 70.3 × 0.5 = 344 calories

Key Terms You Should Know

MET (Metabolic Equivalent of Task) — A standardized measure of exercise intensity. 1 MET = resting metabolism. Light activities are 1.5–2.9 METs, moderate activities are 3.0–5.9 METs, and vigorous activities are 6.0+ METs.
EPOC (Excess Post-Exercise Oxygen Consumption) — Also called the "afterburn effect," this is the elevated calorie burn that continues after exercise ends. High-intensity exercise can produce EPOC lasting 12–24 hours, adding 6–15% to the total calorie cost of a workout.
Heart Rate Zone — Ranges of heart rate intensity (typically 50–90% of maximum heart rate) used to categorize exercise intensity. Higher heart rate zones generally correspond to higher MET values and greater calorie burn.
Net Calories Burned — The additional calories burned above what you would have burned at rest. If you burn 344 calories running in 30 minutes but would have burned 50 calories sitting during that time, the net burn is 294 calories. The calories burned calculator shows both gross and net values.
VO2 Max — The maximum rate of oxygen your body can use during exercise, measured in mL/kg/min. Higher VO2 Max indicates better cardiovascular fitness. Elite athletes may have VO2 Max values of 60–85 mL/kg/min, compared to 30–40 for average adults.

MET Values for Common Activities

The following table lists MET values from the Compendium of Physical Activities and corresponding calorie burn estimates for a 155-lb (70 kg) person exercising for 30 minutes. Values are for a typical adult performing each activity at the described intensity.

Activity	MET Value	Intensity	Cal/30 min (155 lb)
Sitting (baseline)	1.0	Rest	35
Walking, 2.5 mph	3.0	Light	105
Walking, 3.5 mph	4.3	Moderate	151
Walking, 4.5 mph (brisk)	6.3	Vigorous	221
Running, 5 mph (12-min mile)	8.3	Vigorous	291
Running, 6 mph (10-min mile)	9.8	Vigorous	344
Running, 8 mph (7.5-min mile)	11.8	Very vigorous	414
Cycling, 12–14 mph	8.0	Vigorous	281
Cycling, 16–19 mph	10.0	Very vigorous	351
Swimming, moderate laps	7.0	Vigorous	246
Swimming, vigorous laps	9.8	Very vigorous	344
Jump rope, moderate	10.0	Very vigorous	351
Rowing machine, moderate	7.0	Vigorous	246
Elliptical trainer	5.0	Moderate	176
Weight training, moderate	3.5	Moderate	123
Weight training, vigorous	6.0	Vigorous	211
Yoga, Hatha	2.5	Light	88
Yoga, Power/Vinyasa	4.0	Moderate	140
Stair climbing	9.0	Vigorous	316
Dancing, aerobic	7.3	Vigorous	256
Hiking, moderate terrain	5.3	Moderate	186
Tennis, singles	8.0	Vigorous	281
Basketball, game play	8.0	Vigorous	281
Soccer, casual	7.0	Vigorous	246
Gardening, general	3.8	Moderate	133
House cleaning	3.3	Moderate	116

Practical Examples

Example 1: Morning Walk

A 180-lb (81.6 kg) person walks at 3.5 mph for 45 minutes.

MET for walking at 3.5 mph = 4.3

Duration = 45 min = 0.75 hours

Calories = 4.3 × 81.6 × 0.75 = 263 calories

For a more detailed breakdown, try the walking calorie calculator which also accounts for incline.

Example 2: Gym Session (Mixed Workout)

A 140-lb (63.5 kg) person does 20 minutes of cycling and 25 minutes of weight training.

Cycling (12–14 mph): 8.0 × 63.5 × 0.333 = 169 calories

Weight training (moderate): 3.5 × 63.5 × 0.417 = 93 calories

Total session: 169 + 93 = 262 calories in 45 minutes

Example 3: Swimming Laps

A 200-lb (90.7 kg) person swims moderate freestyle laps for 40 minutes.

MET for moderate swimming laps = 7.0

Duration = 40 min = 0.667 hours

Calories = 7.0 × 90.7 × 0.667 = 423 calories

Swimming burns slightly more calories than many land-based exercises at similar perceived effort because the body must also work to maintain temperature in cooler water. Use the swimming calorie calculator for stroke-specific estimates.

Common Mistakes When Estimating Calorie Burn

Trusting machine readouts blindly. Treadmills, ellipticals, and stationary bikes often overestimate calorie burn by 15–30% because they use generic formulas that do not account for individual fitness level or body composition. A 2018 study in the Journal of Exercise Science & Fitness found cardio machines overestimate by an average of 19%.
Confusing gross and net calories. The MET formula gives gross calories (total energy expenditure). Net calories subtract your resting metabolism for the same time period. If you burned 300 gross calories in 30 minutes, and your resting burn is 50 calories per 30 minutes, the net burn is 250 calories.
Ignoring the afterburn effect. High-intensity exercise creates EPOC (Excess Post-Exercise Oxygen Consumption), which can add 6–15% to total calorie burn over the next 12–24 hours. Steady-state cardio produces minimal EPOC.
Not adjusting for fitness level. Fitter individuals are more mechanically efficient and may burn slightly fewer calories than the MET formula predicts for the same activity. Beginners may burn slightly more.
Overestimating exercise duration. A "60-minute gym session" typically includes 10–15 minutes of warming up, resting between sets, and transitioning between exercises. The actual active exercise time may be only 40–45 minutes.
Eating back all exercise calories. Because calorie burn estimates have inherent error, many nutrition experts recommend eating back only 50–75% of exercise calories if your goal is weight loss.

Tips for Maximizing Calorie Burn

Add interval training. Alternating between high and low intensity (HIIT) burns 25–30% more calories than steady-state exercise at the same average intensity, according to a meta-analysis in the British Journal of Sports Medicine. A 20-minute HIIT session can match the calorie burn of a 40-minute moderate jog.
Incorporate resistance training. While weight training burns fewer calories per session than cardio, the muscle it builds raises your BMR, increasing calorie burn 24/7. A combination of cardio and resistance training is optimal for long-term weight management.
Increase NEAT. Non-Exercise Activity Thermogenesis—walking, standing, fidgeting, taking stairs—can account for 200–900 extra calories per day. Standing desks, walking meetings, and parking farther away all contribute.
Exercise in the morning. Research suggests that morning exercise may produce slightly higher EPOC compared to evening workouts, though the difference is modest. The most important factor is consistency—exercise whenever you will actually do it.
Track your TDEE regularly. Your Total Daily Energy Expenditure changes as your fitness improves, weight changes, or activity patterns shift. Recalculate every 4–6 weeks.

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Disclaimer: This guide is for informational purposes only and does not constitute medical or nutritional advice. Always consult a qualified healthcare professional for decisions specific to your situation.

Frequently Asked Questions

How many calories does walking burn per mile?

Walking burns approximately 80–100 calories per mile for a 155-pound (70 kg) person at a moderate pace of 3.0 mph (MET 3.5). The exact number depends on your body weight, walking speed, and terrain. A heavier person burns more calories per mile because moving a larger body requires more energy. For example, a 200-pound person burns roughly 110–130 calories per mile walking at the same pace. Walking uphill increases calorie burn by 30–60% compared to flat terrain. Use the walking calorie calculator for a personalized estimate based on your specific weight and conditions.

What is a MET value and how is it used?

A MET (Metabolic Equivalent of Task) is a unit that represents the energy cost of a physical activity as a multiple of your resting metabolic rate. One MET equals the energy you expend sitting quietly, approximately 3.5 mL of oxygen per kilogram of body weight per minute, or roughly 1 calorie per kilogram per hour. An activity rated at 6 METs burns 6 times more energy than sitting still. The Compendium of Physical Activities, maintained by Arizona State University, catalogs MET values for over 800 activities. To calculate calories burned, multiply the MET value by your weight in kilograms and the duration in hours.

Are fitness tracker calorie estimates accurate?

Fitness trackers provide reasonable estimates but are not perfectly accurate. A 2019 study published in the Journal of Personalized Medicine found that popular wearable devices overestimate calorie burn by 28–93% depending on the activity type and device brand. Wrist-based heart rate monitors tend to be more accurate for steady-state cardio like running (within 10–15% error) but less reliable for strength training, cycling, and HIIT. The Stanford University School of Medicine tested seven popular wearables and found that even the most accurate device had a 27% average error for energy expenditure. Use tracker data as a general guide, not an exact measurement.

Does muscle mass affect how many calories you burn during exercise?

Yes, people with more muscle mass burn more calories during exercise and at rest. Muscle tissue is metabolically active, consuming approximately 6–7 calories per pound per day at rest compared to about 2 calories per pound for fat tissue, according to the National Strength and Conditioning Association. During exercise, the effect is amplified because muscle is the primary tissue performing the work. Two people of the same total body weight may burn different calories during identical activities if one has significantly more lean mass. However, the standard MET formula uses total body weight, which means it may slightly underestimate calorie burn for very muscular individuals.

How many calories do you burn doing nothing?

Your body burns calories 24 hours a day through basic life functions, even while completely at rest. This is your Basal Metabolic Rate (BMR). For the average adult, BMR ranges from 1,200 to 2,000 calories per day. A 155-pound (70 kg) person burns approximately 70 calories per hour just sitting still, which equals 1,680 calories in 24 hours of complete rest. Sleeping burns slightly fewer calories (about 90% of your awake resting rate) because body temperature and many processes slow down. Use the BMR calculator to find your personalized resting calorie burn.

What exercise burns the most calories per hour?

Running at 10 mph (6-minute mile pace) burns the most calories of common exercises at approximately 1,228 calories per hour for a 155-pound person (MET 14.5). Other high-calorie-burning activities include jump rope at a vigorous pace (1,074 cal/hr, MET 12.3), swimming butterfly stroke (878 cal/hr, MET 13.8), and cycling at 16–19 mph (878 cal/hr, MET 10). However, sustainability matters more than peak burn rate. Most people cannot maintain maximum-intensity exercise for a full hour. A moderate 30-minute run at 6 mph burns about 344 calories, which is a more realistic comparison point for most exercisers.