How Are Exercise Calories Calculated?
This calculator uses MET (Metabolic Equivalent of Task) values — a standardised measure of exercise intensity developed by the American College of Sports Medicine. A MET of 1 equals the energy used sitting at rest; running at 12 km/h has a MET of ~11, meaning it burns 11 times more energy than rest.
Calories = MET × Weight (kg) × Duration (hours)
Most Effective Exercises for Calorie Burn
Running burns the most calories per hour among common activities, followed by HIIT, cycling, and swimming. However, the best exercise for calorie burn is one you can sustain consistently. Zone 2 cardio performed for 45–60 minutes burns substantial total calories and is easier to recover from than high-intensity training.
Why Exercise Calorie Trackers Overestimate
Fitness trackers and apps frequently overestimate calorie burn by 20–50%. This is because MET values represent averages, and actual burn varies with fitness level, body composition, and efficiency of movement. Use calorie burn estimates as rough guides, not precise figures.
Frequently Asked Questions
Does body weight affect how many calories I burn?
Yes. Heavier individuals burn more calories performing the same activity because moving more mass requires more energy. This is why weight loss becomes progressively harder as body weight decreases.
Does fitness level affect calorie burn?
Yes. Fitter individuals burn slightly fewer calories performing the same activity at the same heart rate because their bodies become more efficient. Perceived effort is therefore a better guide to intensity than calorie readout.
Should I eat back the calories I burn during exercise?
This depends on your goal. For fat loss, eating back some (not all) exercise calories prevents excessive deficits that cause muscle loss. Your TDEE already includes a moderate activity allowance, so avoid double-counting.
Medical Disclaimer: This calculator is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for health decisions.