To calculate calories burned per activity: Calories = MET × Body Weight (kg) × Duration (hours). MET (Metabolic Equivalent of Task) is a measure of exercise intensity relative to sitting still (MET=1). Running at 6 mph has MET=9.8; walking at 3 mph has MET=3.5. A 70 kg person running for 30 minutes: 9.8 × 70 × 0.5 = 343 calories. The same person walking 30 minutes: 3.5 × 70 × 0.5 = 123 calories.
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What Is a Calorie Burn Calculator?
A calorie burn calculator estimates how many calories your body expends during a specific physical activity, based on the activity's intensity, your body weight, and the duration. This differs from your total daily calorie burn (TDEE), which includes resting metabolism and all daily movement. A calorie burn calculator focuses specifically on the energy cost of discrete exercise sessions or activities.
The scientific foundation for activity calorie calculations is MET, or Metabolic Equivalent of Task. A MET value represents the ratio of energy expended during an activity relative to sitting at rest (which has a MET of 1.0). Walking briskly at 3.5 mph has a MET of about 4.3 — meaning it burns roughly 4.3 times the calories of sitting still. Running at 6 mph has a MET of about 9.8. The Compendium of Physical Activities, maintained by researchers at Arizona State University, catalogs MET values for over 800 activities and is the reference database used by most scientific studies and fitness applications.
The formula — Calories = MET × body weight in kilograms × duration in hours — is the standard used in exercise science research. Body weight is included because moving more mass requires more energy. This is why a 200-pound person burns significantly more calories doing the same exercise at the same pace as a 140-pound person. Individual variation in fitness level, terrain, temperature, and metabolism means estimates carry roughly ±20% accuracy, but the MET formula is the most reliable standardized method available without laboratory equipment.
MET Values for Common Activities
| Activity | MET Value | Calories/hr (70kg person) | |----------|-----------|--------------------------| | Sitting | 1.3 | 91 | | Standing | 1.8 | 126 | | Walking (2.5 mph) | 2.9 | 203 | | Walking (3.5 mph) | 4.3 | 301 | | Hiking | 5.3 | 371 | | Running (5 mph) | 8.3 | 581 | | Running (7.5 mph) | 11.0 | 770 | | Cycling (casual) | 6.0 | 420 | | Cycling (vigorous) | 12.0 | 840 | | Swimming (laps) | 8.0 | 560 | | Jump rope | 12.3 | 861 | | Yoga | 3.0 | 210 | | Weight lifting (moderate) | 5.0 | 350 | | HIIT | 8.0–12.0 | 560–840 | | Dancing | 4.5–7.8 | 315–546 | | Gardening | 3.5–5.0 | 245–350 |
Calorie Burn Formula
Calories = MET × Weight (kg) × Duration (hours)
Convert pounds to kg: weight_lbs × 0.4536
Examples:
| Person | Activity | Duration | Calories Burned | |--------|---------|----------|----------------| | 150 lb (68 kg) | Walking 3.5 mph | 45 min | 301 × 0.75 = 226 | | 200 lb (91 kg) | Running 6 mph | 30 min | 770 × 0.5 × (91/70) = 501 | | 130 lb (59 kg) | Cycling vigorous | 60 min | 840 × 1.0 × (59/70) = 708 | | 180 lb (82 kg) | Swimming laps | 45 min | 560 × 0.75 × (82/70) = 492 |
Note: Multiply base calories (for 70 kg) by (your_weight_kg / 70) to adjust for your weight.
Calorie Deficit for Weight Loss
One pound of fat ≈ 3,500 calories. To lose 1 lb/week: create a deficit of 500 calories/day (through diet, exercise, or both).
Sample approaches for 500 calorie/day deficit:
- Reduce intake by 500 calories (dietary only)
- Run 30 minutes (~350 cal burned) + reduce intake by 150 calories
- Walk 60 minutes (~300 cal) + reduce intake by 200 calories
- 30-min HIIT session (~400 cal) + minor dietary adjustment (~100 cal)
Exercise-only weight loss is slower than combined approach — 500 calories from running alone requires ~45 minutes daily. Most research shows the most effective weight loss combines moderate calorie reduction with increased physical activity.
Frequently Asked Questions
Are calorie burn estimates from fitness trackers accurate? Wearable fitness trackers (Apple Watch, Fitbit, Garmin) typically overestimate calorie burn by 20–40% for most activities. Heart rate-based estimates are more accurate than step-count-based ones but still have significant variation. Studies show that across popular wearables, calorie burn estimates can be off by 27–93%. Use these as a rough guide rather than precise measurement. For weight management decisions, err on the side that exercise burned fewer calories than the device suggests.
How does body weight affect calorie burn? Heavier people burn more calories performing the same activity because they are moving more mass. This is why the MET formula multiplies by body weight. A 250-pound person burns about 43% more calories running at the same pace as a 175-pound person. This effect also means that as you lose weight, you burn fewer calories doing the same exercise at the same intensity — one reason weight loss plateaus occur.
Does running burn more calories than walking the same distance? Calorie burn per distance (not per time) is similar for running and walking because you're moving the same mass the same distance. The difference is time — running completes the distance faster. Per mile, running burns approximately 100 calories for a 154-pound person; walking burns approximately 75–80 calories. Running burns more per minute but similar per mile. The advantage of running for weight loss is time efficiency — you can exercise more intensely in less time.
What is EPOC and does it increase total calorie burn? Excess Post-Exercise Oxygen Consumption (EPOC), sometimes called the "afterburn effect," is the elevated calorie burn after exercise as your body returns to resting state. High-intensity exercise (HIIT, heavy strength training) produces more significant EPOC. However, research shows EPOC typically adds only 6–15% more calories above what was burned during the exercise itself — not the dramatic "burn calories for 24 hours" claims in some marketing. EPOC is real but modest; intensity matters more for total calorie burn through the exercise itself.
How many calories do muscles burn at rest? A pound of muscle burns approximately 6 calories per day at rest; a pound of fat burns ~2 calories per day. The difference sounds dramatic in theory (more muscle = higher metabolism), but it's modest in practice — adding 5 pounds of muscle increases resting metabolism by only ~30 calories/day. The primary benefit of strength training for metabolism is the calorie burn during training and recovery (EPOC), not the marginal resting metabolic rate increase from muscle tissue itself.
Related Free Tools on RoughTools
- Calorie Calculator (TDEE) — calculate total daily calorie needs
- BMI Calculator — assess weight relative to height
- Macro Calculator — set protein, carb, and fat targets for your goals
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The free Calorie Burn Calculator at RoughTools calculates calories burned for 300+ activities using MET values and your body weight. Enter any activity, duration, and weight for an instant estimate. No account needed, completely free.