Why this matters
Calorie tracking is the foundation of any weight management strategy, and exercise is the variable component that you can directly control through activity choice and duration. But raw calorie counts from fitness apps are often opaque — you see a number but have no way to evaluate its reliability. The MET-based approach used here traces directly to the Compendium of Physical Activities published by Ainsworth et al., which is the standard reference used by exercise physiologists and researchers worldwide.
Understanding the MET formula — Calories = METs * 3.5 * weight(kg) / 200 * minutes — lets you see exactly why running burns more than walking, why swimming differs from cycling, and how your body weight amplifies or diminishes the burn for any given activity. The 3.5 constant represents oxygen consumption at rest in ml/kg/min, and the division by 200 converts that oxygen volume into kilocalories. Every number in the calculation has a physiological basis, which means you can trust the estimate as a reasonable population-average rather than an arbitrary multiplier.
MET values for common exercises
| Activity | MET Value | Intensity Level | Calories/hr at 70 kg |
|---|---|---|---|
| Walking (moderate) | 3.5 | Moderate | ~246 kcal |
| Weight lifting | 6.0 | Moderate | ~421 kcal |
| Cycling (moderate) | 8.0 | Vigorous | ~561 kcal |
| Swimming | 6.0-10.0 | Moderate to vigorous | ~421-701 kcal |
| Running (general) | 9.8 | Vigorous | ~686 kcal |
| HIIT | 8.0-12.0 | High | ~561-841 kcal |
| Yoga | 3.0 | Light | ~211 kcal |
| Jump rope | 12.3 | Very vigorous | ~862 kcal |
How to use it
Select an exercise type from the dropdown list — 15 activities are available covering cardio, strength, flexibility, and mixed modalities.
Enter your body weight in kilograms.
Enter the duration of your exercise session in minutes.
Read the total calories burned and the per-minute burn rate, which updates instantly as you change any value.
Compare different activities by changing the exercise selection while keeping weight and duration constant.
Testing your result
Verify with a known benchmark: a 70 kg person running for 60 minutes at a MET value of approximately 9.8 should burn roughly 686 kcal using the formula (9.8 * 3.5 * 70 / 200 * 60). Cross-reference against your fitness tracker's estimate — if the numbers differ by more than 15 to 20 percent, it likely means the tracker uses a personalized algorithm that accounts for heart rate and fitness level, while the MET approach uses population averages. For walking at moderate intensity (3.5 METs), a 70 kg person should see approximately 4.1 calories per minute, which you can verify with the tool's per-minute readout.
Common mistakes
Assuming MET estimates are exact for your body — they are population averages, and individual variation can reach 20 percent or more depending on fitness level, technique, and environmental conditions.
Confusing gross and net calorie burn — the MET formula gives gross burn including resting metabolism, whereas net burn subtracts your baseline calories.
Using weight-lifting calorie numbers to justify skipping cardio — moderate weightlifting burns similar calories to brisk walking, but its primary benefit is muscle building, not calorie expenditure.
Comparing MET values across activities without considering that higher MET activities are harder to sustain for long durations.
Edge cases and options
The MET values in the tool come from the Compendium of Physical Activities, which assigns single representative values to broad activity categories. Activities like swimming and cycling have wide MET ranges depending on pace and technique — the tool uses moderate-intensity values as defaults. Your actual burn during a high-intensity interval session will differ significantly from a steady-state session of the same nominal activity, because MET values do not capture the elevated post-exercise oxygen consumption (EPOC) that follows intense efforts. Body composition also affects accuracy: individuals with higher muscle mass burn more calories at the same body weight because muscle tissue is metabolically more active than fat tissue.
Real-world use cases
Planning a weekly exercise schedule that targets a specific calorie expenditure goal by selecting activities and durations that fit your available time.
Comparing the calorie efficiency of different workout formats — for example, 30 minutes of HIIT versus 60 minutes of walking — to optimize limited gym time.
Tracking progress over time by logging consistent exercise sessions and watching total weekly calories increase as fitness improves.
Building a nutrition plan that accounts for exercise calories by adding the tool's estimates to your basal metabolic rate from a BMR calculator.
Frequently asked questions
Q: What is the MET formula?
A: Calories = METs * 3.5 * weight(kg) / 200 * minutes. MET (metabolic equivalent) values are population averages for each activity from the Compendium of Physical Activities.
Q: Where do MET values come from?
A: The Compendium of Physical Activities (Ainsworth et al.) — the standard reference for energy expenditure of physical activities used by researchers and exercise physiologists worldwide.
Q: Why might my actual burn differ?
A: METs are averages. Your actual burn depends on intensity, fitness level, terrain, weather, equipment and metabolic efficiency.
Q: Does weight lifting burn many calories?
A: Moderate weightlifting is ~6 METs — similar to brisk walking. The big benefit of strength training is building muscle, which raises resting metabolic rate.
Q: How does this relate to heart rate-based calorie tracking?
A: Heart rate monitors use algorithms that incorporate your age, weight, and heart rate data for personalized estimates. METs provide a general benchmark that is less personalized but more transparent in its assumptions.
Start using it now
Try the Exercise Calorie Burn tool. See also Steps to Calories Calculator and Calorie Calculator for broader dietary and activity tracking.
