Calories Burned Calculator
Estimate calories burned for any physical activity using MET (Metabolic Equivalent of Task) values, your weight, and duration.
How to use this calories burned calculator
- 1Enter your body weight — calorie burn scales directly with weight.
- 2Enter exercise duration in minutes.
- 3Select the activity closest to yours — choose moderate or vigorous based on your actual effort.
- 4Use the result as an estimate — actual burn varies 10–25% based on fitness level and terrain.
- 5Do not eat back all exercise calories if weight loss is your goal — most people overestimate burn.
How it's calculated
kcal = MET × 3.5 × weight(kg) ÷ 200 × duration(min). MET values from Ainsworth's Compendium of Physical Activities.
About the Calories Burned Calculator
Exercise calorie calculations serve two important purposes: estimating calorie expenditure for dietary planning, and providing perspective on how much work creates meaningful calorie deficits through activity alone.
A 160-pound person running at 6 mph for 45 minutes burns approximately 490 calories — roughly equivalent to a large fast-food meal. This does not mean exercise is ineffective for weight management; it means exercise alone, without dietary modification, produces slow weight loss for most people. The value of exercise extends far beyond calorie burning: cardiovascular health, insulin sensitivity, mental health, bone density, immune function, longevity, and functional capacity all improve with regular exercise regardless of whether it creates a deficit.
The relationship between exercise and appetite is more complex than the simple burn-calories-eat-less model suggests. Research by Herman Pontzer's laboratory shows that moderate exercise does not consistently increase appetite proportionally to calorie burn — which is why active individuals do not eat dramatically more than sedentary people despite burning substantially more calories. However, very high-volume training (marathon training) does appear to increase compensatory appetite significantly.
For practical application, the most effective role of exercise in weight management is not as a calorie-burning machine but as a muscle-preserving, metabolism-supporting complement to dietary management. Strength training specifically preserves or builds muscle during calorie restriction, preventing the metabolic adaptation that makes sustained weight loss progressively harder. The combination of moderate calorie restriction plus resistance training consistently outperforms either approach alone for fat loss while preserving body composition.
Frequently asked questions
Are these calorie burn estimates accurate?
MET-based calculations are more accurate than wearable fitness tracker estimates for steady-state aerobic exercise, but all methods have limitations. Research shows fitness trackers (Apple Watch, Fitbit, Garmin) overestimate calorie burn by an average of 15–25%. MET calculations have been validated against indirect calorimetry and show accuracy within 10–15% for most steady-state activities in people of average fitness. Individual variation is real — a trained athlete burning fat efficiently may burn slightly fewer calories per minute than predicted for the same MET activity. For tracking, trends over time matter more than absolute numbers.
What is a MET value?
MET (Metabolic Equivalent of Task) is a ratio of energy expenditure during an activity compared to resting energy expenditure. A MET of 1.0 is sitting completely still (resting metabolic rate). A MET of 7.0 (moderate cycling) means the activity burns approximately 7 times more energy per minute than resting. MET values for hundreds of activities are compiled in the Compendium of Physical Activities, developed by Barbara Ainsworth and colleagues. Activities above MET 6 are classified as vigorous by public health guidelines; 3–6 is moderate; below 3 is light activity.
Is cardio or strength training better for burning calories?
Cardio burns more calories during the session for equivalent durations — 45 minutes of running burns substantially more than 45 minutes of strength training. However, strength training has advantages: it builds muscle mass, which elevates resting metabolic rate permanently. It produces excess post-exercise oxygen consumption (EPOC) — elevated calorie burn for up to 48 hours after training. And it preserves muscle during calorie restriction, preventing the metabolic slowdown that makes sustained weight loss progressively harder. Combining both modalities produces better body composition outcomes than either alone.
Should I eat back the calories I burn exercising?
This depends on your goals. For weight loss: be cautious about eating back exercise calories — most people overestimate exercise burn and underestimate food intake. A common strategy is eating back 50% of estimated exercise calories. For maintenance: eating back exercise calories prevents unintentional weight loss. For performance and muscle building: adequate fueling before and after training matters more than calorie balance. Underfueling impairs training quality and adaptation. Athletes in heavy training phases may need to actively increase intake to support performance.