This calculator uses MET (Metabolic Equivalent of Task) values from the Compendium of Physical Activities, a widely recognized research database. The formula is: Calories = MET × Body Weight (kg) × Duration (hours). While it provides a solid estimate, actual calorie burn varies based on individual factors like age, gender, fitness level, body composition, and exercise intensity. For most people, the estimate is within ±10–20% of actual expenditure. For precise tracking, consider using a heart rate monitor or fitness tracker.

MET (Metabolic Equivalent of Task) is a unit that measures the energy cost of physical activities. 1 MET represents the energy your body uses at complete rest (sitting quietly). An activity rated at 5 METs requires 5 times more energy than resting. For example, brisk walking at 4 mph has a MET value of about 5.0, while running at 6 mph has a MET of approximately 9.8. MET values allow standardized calorie burn calculations across different body weights and activity types, making them the gold standard for exercise calorie estimators.

Body weight is a primary factor in calorie expenditure. A heavier person burns more calories performing the same activity for the same duration because their body requires more energy to move greater mass. For instance, a 90 kg (198 lbs) person running for 30 minutes burns roughly 440 calories, while a 60 kg (132 lbs) person burns about 295 calories for the same run. That's why this calculator asks for your weight — without it, estimates would be significantly less accurate.

Among common exercises, jump rope (skipping) tops the list at approximately 12 METs, burning around 800–1,000+ calories per hour for an average-weight person. Other high-calorie-burning activities include running at 6 mph (9.8 METs), swimming breaststroke (10 METs), and stair climbing (8 METs). High-intensity interval training (HIIT) also ranks high at around 8 METs. Use this calculator to compare different activities side-by-side and find the most efficient calorie-burning exercise for your goals.

Absolutely. Weight loss fundamentally requires a caloric deficit — burning more calories than you consume. Since 1 pound of body fat equals approximately 3,500 calories, you can use this calculator to estimate how much exercise is needed to create that deficit. For example, if you burn 300 calories per session and exercise 5 days a week, that's 1,500 calories per week from exercise alone. Combined with dietary adjustments, this tool helps you design an effective, sustainable weight loss plan. Remember to consult a healthcare professional before starting any new exercise regimen.

Running burns significantly more calories per minute than walking. Running at 6 mph (9.8 METs) burns nearly 3 times more calories than walking at 3 mph (3.5 METs). However, walking for longer durations can accumulate substantial calorie burn with less impact on joints. For a 70 kg person, 30 minutes of running at 6 mph burns ~343 calories, while 30 minutes of walking at 3 mph burns ~123 calories. The best exercise is one you can sustain consistently — both running and walking offer excellent health benefits. Use this activity calorie calculator to find the right balance for your fitness level.

MET-based calculations focus on body weight as the primary variable, which already accounts for a significant portion of the difference between individuals. While men typically have higher muscle mass and slightly higher metabolic rates, the difference in calorie burn during exercise is largely driven by body weight and intensity. For highly precise individual estimates, factors like age, gender, lean body mass, and VO₂ max would need to be included — but for most practical purposes, weight-based MET calculations provide sufficiently accurate estimates for both men and women.

Beyond weight and activity type, several factors affect real-world calorie burn: exercise intensity (effort level), fitness level (more efficient movers burn slightly fewer calories), body composition (muscle burns more than fat at rest), age (metabolism slows with age), environmental conditions (heat and cold can increase expenditure), and terrain (hills vs. flat ground). This calculator provides a baseline estimate — individual results may vary. For the most accurate personal data, combine this tool with a wearable fitness tracker.