SnapCalorieBurn — free MET-based calorie calculators
SnapCalorieBurn estimates how many calories an activity burns from three inputs: the activity's MET value, your body weight, and how long you did it. Pick an activity, enter your body weight (kg or lb), how long you did it, and the intensity, pace or style where the calculator offers one. The result is an estimate in calories (kcal) of gross energy expenditure — it includes what you would have burned at rest — not a measurement. No account, no tracking, and the calculation runs entirely in your browser.
Every estimate on this site uses one formula: Calories = MET × body weight (kg) × duration (hours). A MET value describes how much energy an activity costs relative to sitting still, so the same activity costs more calories for a heavier person and for a longer session. Intensity matters just as much as duration: brisk walking and strolling are different MET values, not the same walk.
Reference scenario — not your own numbers. Every figure below is for a 155 lb (70 kg) adult doing 30 minutes of the activity, calculated with the same engine the interactive calculators use. Enter your own weight and duration for a personal estimate.
| Activity | Intensity used | MET | 30 min |
|---|---|---|---|
| Walking | Moderate (3 mph) | 3.5 | ~123 cal |
| Running | Moderate (6 mph, 10 min/mile) | 9.3 | ~326 cal |
| Cycling | Moderate (10–12 mph) | 6.8 | ~238 cal |
| Swimming | Freestyle, slow / recreational | 5.8 | ~203 cal |
| Yoga | General yoga class | 2.3 | ~81 cal |
| Climbing Stairs | Fast, continuous climbing | 8.8 | ~308 cal |
| Cleaning | Moderate (vacuuming, mopping) | 3.3 | ~116 cal |
| Sleeping | Asleep | 0.95 | ~33 cal |
Worked example. Walking at a moderate 3 mph is MET 3.5. For a 155 lb (70 kg) adult walking 30 minutes: 3.5 × 70 × 0.50 h ≈ 123 calories.
These are estimates, not measurements. The number changes with how hard you actually worked, your body composition and fitness, terrain and equipment, and normal day-to-day variation in metabolism. Figures are gross calories, meaning they include the energy you would have burned at rest during the same period. Treat any single figure as a good ballpark, not a precise count.
MET values are taken from the 2024 Adult Compendium of Physical Activities. Where a specific activity has no matching entry, SnapCalorieBurn uses a documented representative value and says so on the page rather than implying the number was sourced.