Calories Burned Calculator
MET Formula · 40+ Activities
lbs
min
Enter your weight, choose an activity, and set the duration to see calories burned.
Calories Burned
0
kcal in 30 minutes
Details
Activity
MET value
Duration
Your weight
Total calories burned
Food Equivalents
vs. Other Activities (same duration)
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How Calories Burned Is Calculated
This calculator uses the MET (Metabolic Equivalent of Task) formula, the standard method used in exercise science. MET values represent how many times more energy an activity requires compared to sitting at rest. The formula is: Calories = MET × weight in kg × time in hours. MET values are sourced from the Compendium of Physical Activities (Ainsworth et al., 2011), the most comprehensive reference database for exercise energy expenditure.
A MET of 1 equals the energy cost of sitting quietly (approximately 1 kcal per kg per hour). Running at 6 mph has a MET of about 10, meaning it burns roughly 10 times more energy per minute than sitting. The heavier you are, the more calories any activity burns — carrying more mass requires more energy for the same movement.
MET Values Explained
Activities are classified by intensity: Light (MET 1.5–3): walking slowly, cooking, desk work. Moderate (MET 3–6): brisk walking, casual cycling, dancing. Vigorous (MET 6–9): running at 5 mph, swimming laps, heavy cycling. Very vigorous (MET 9+): sprinting, competitive sports, HIIT. Higher MET = more calories burned per minute at the same body weight.
Why Body Weight Matters
A 200-lb person burns significantly more calories than a 130-lb person doing the same activity for the same time, because moving more mass requires more energy. This is also why weight loss slows over time — as you lose weight, the same exercise burns fewer calories. A 10% reduction in body weight reduces exercise energy expenditure by approximately 10%.
Exercise vs. Daily Activity
NEAT (Non-Exercise Activity Thermogenesis) — the calories burned through daily activities like walking, fidgeting, and standing — can account for 15-50% of total daily calorie burn for active people. Increasing daily movement (standing at work, walking more) often burns more total calories than adding one gym session per week. Both intentional exercise and NEAT contribute to total energy expenditure.
Accuracy Limitations
MET-based calorie estimates have 10-20% individual variation due to fitness level, age, body composition, and exercise efficiency. Trained athletes burn fewer calories for the same activity (greater efficiency). Lab-measured calorie burn (indirect calorimetry) is more accurate but not practical for daily use. Fitness trackers add heart rate data but still have 15-30% error margins. Use these estimates for general guidance, not precise accounting.
Calorie estimates are based on population averages and have approximately 10-20% individual variation. Results may differ based on fitness level, age, body composition, and exercise efficiency. Not a substitute for professional exercise or medical advice.
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Calories Burned Questions
How are calories burned during exercise calculated?+
Exercise calorie calculations use the MET (Metabolic Equivalent of Task) formula: Calories = MET × body weight in kg × time in hours. MET values represent the energy cost of an activity relative to sitting at rest (MET 1). Walking briskly has a MET of about 3.5 (3.5x the energy of sitting). Running at 6 mph has a MET of about 10. The formula multiplies by body weight because heavier people require more energy for the same movement. MET values come from the Compendium of Physical Activities, a peer-reviewed database maintained since 1993.
How many calories does 30 minutes of walking burn?+
At a brisk pace (3.5 mph, MET 3.5), a 150-lb (68 kg) person burns approximately 200 calories in 30 minutes. At a moderate pace (3.0 mph, MET 3.0), the same person burns about 170 calories. At a fast pace (4.0 mph, MET 5.0), about 285 calories. Walking on an incline or carrying weight significantly increases calorie burn. A 200-lb person burns about 35% more than a 150-lb person doing the same walk.
Does running burn more calories than walking the same distance?+
Yes, but the difference is smaller than most people expect. Running burns slightly more calories per mile than walking the same distance because running involves a vertical oscillation component (bouncing up and down) that walking does not. The difference is approximately 25-30% more calories per mile for running vs walking. However, per minute of time, running burns significantly more — roughly 2-3x more per minute than walking, because you cover more distance in the same time. For total calorie burn, running is more efficient per minute; for low-intensity steady exercise, walking burns fewer per minute but may be sustainable for longer sessions.
What exercise burns the most calories per hour?+
The highest MET activities burn the most calories per hour. Top calorie burners per hour for a 155-lb (70 kg) person: Vigorous rowing (MET 12): ~840 cal/hr. Running at 8 mph (MET 11.5): ~805 cal/hr. Vigorous cycling (MET 10): ~700 cal/hr. Swimming (vigorous laps, MET 10): ~700 cal/hr. Jump rope (fast, MET 12): ~840 cal/hr. Cross-country skiing (MET 9): ~630 cal/hr. The exact number always depends on body weight and exercise intensity — a heavier person burns more per hour at the same MET level.
How accurate are calorie estimates from fitness trackers?+
Most fitness trackers have a 15-30% average error margin for calorie burn estimates. A 2017 Stanford University study found errors ranging from 27% (Apple Watch, most accurate) to 93% (PurePulse Fitbit, least accurate) across 7 popular devices. Trackers that use heart rate tend to be more accurate than accelerometer-only devices. Tracking trends over time is more reliable than trusting individual session numbers. The MET formula used in this calculator has a similar error margin — both approaches are estimates, not measurements. Direct calorimetry (measuring gas exchange in a lab) is the gold standard but impractical for daily use.
Do you burn more calories exercising in the heat or cold?+
Both extremes increase calorie burn slightly, but through different mechanisms. In cold weather, shivering thermogenesis and maintaining core body temperature require additional energy. Running in cold weather burns approximately 5-10% more calories than the same run in temperate conditions. In hot weather, the cardiovascular system works harder to cool the body, slightly increasing energy expenditure and heart rate for the same pace. However, heat significantly impairs performance, so most people exercise less intensely in the heat, often resulting in fewer total calories burned despite the higher per-minute rate. The effects are modest compared to the dominant variables of weight and activity intensity.
Does muscle burn more calories than fat at rest?+
Yes, but the difference is often exaggerated. Muscle tissue burns approximately 6 calories per pound per day at rest, while fat tissue burns about 2 calories per pound per day. This means 10 lbs of added muscle increases resting calorie burn by only about 40 calories per day — not the 200-300 claimed by some fitness marketing. The bigger benefit of muscle is its contribution to exercise calorie burn (more muscle = more force production = greater energy expenditure during exercise) and the post-exercise oxygen consumption (EPOC or "afterburn"), which is higher for intense strength training than for moderate cardio.
What is EPOC and how does it affect total calorie burn?+
EPOC (Excess Post-Exercise Oxygen Consumption) is the elevated metabolic rate that persists after exercise as the body restores itself to its pre-exercise state. The "afterburn effect" is real but often overstated in fitness marketing. For steady-state cardio (jogging, cycling), EPOC adds 5-15% to the calories burned during the workout. For high-intensity interval training (HIIT) and heavy strength training, EPOC can add 15-25% to the workout's calorie burn, and it persists for up to 24-48 hours. A 300-calorie HIIT workout might result in 360-375 total calories burned including EPOC. The total EPOC contribution is meaningful over time but is not the dramatic "burn calories for 48 hours" effect often marketed.
How many calories does strength training burn?+
Strength training burns fewer calories during the session than cardio of the same duration, but the comparison is more nuanced. A 155-lb person doing moderate weight training for 60 minutes burns approximately 220-300 calories. The same person running at 6 mph for 60 minutes burns about 600-700 calories. However, strength training creates greater muscle protein synthesis after the session, slightly higher EPOC (afterburn), and over time builds muscle mass that increases resting metabolic rate. For body composition goals (losing fat while preserving muscle), combining strength training with moderate cardio typically produces better long-term results than cardio alone, even though cardio burns more calories per session.
How does exercise intensity affect calorie burn?+
Exercise intensity (measured by MET or heart rate) is the primary driver of calorie burn per minute. Doubling intensity roughly doubles calorie burn. Walking at 2 mph burns about 2.5 METs (175 cal/hr for 155 lbs). Walking at 3.5 mph burns about 3.5 METs (245 cal/hr). Running at 6 mph burns about 10 METs (700 cal/hr). Running at 10 mph burns about 16 METs (1,120 cal/hr). The relationship is approximately linear — each additional MET adds the same number of calories per hour based on body weight. For maximizing calorie burn per unit of time, intensity matters more than duration.