How Many Calories Did You Actually Burn?
How many calories did you burn?
Calories Burned Calculator
MET-Based Calorie Burn for 40+ Activities
Results update in real time — activity comparison, duration table, weekly projections.
Activity Category
Results are estimates only and do not constitute medical advice. Consult a qualified healthcare professional before making health decisions.
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Fitness trackers and gym machines notoriously overestimate caloric burn — often by 30-90%. The elliptical machine says you burned 600 calories in 45 minutes. Your Apple Watch says 450. The reality is probably closer to 300. Understanding why the numbers diverge and how to estimate actual burn more accurately makes a meaningful difference in nutrition planning. The most validated method for estimating caloric expenditure from physical activity uses METs — Metabolic Equivalents of Task. One MET equals your resting metabolic rate (approximately 1 calorie per kilogram of body weight per hour). An activity with a MET value of 4 burns 4 times your resting rate. MET values for hundreds of activities have been measured in laboratory settings and compiled in the Compendium of Physical Activities (Ainsworth et al.) — the scientific gold standard for activity energy expenditure. The formula is straightforward: Calories Burned = MET × weight (kg) × time (hours). The key variable that machines and fitness trackers often get wrong is that caloric burn scales directly with body weight — a 200-lb person burns significantly more doing the same exercise as a 130-lb person, and a 200-lb person who loses 30 lbs will burn fewer calories doing the same workout. This calculator uses current MET research values for accurate, weight-personalized estimates across 50+ activities.
- →Getting an accurate caloric burn estimate for any workout or physical activity
- →Planning caloric intake relative to actual energy expenditure during exercise
- →Comparing the caloric cost of different activities before choosing a workout
- →Understanding how body weight affects caloric burn at the same exercise intensity
- →Tracking weekly total caloric expenditure from exercise across multiple activities
Emma weighs 155 lbs (70.3 kg) and wants to know how many calories she burned during her workout: 30 minutes of running at 6 mph + 20 minutes of weight training. Running at 6 mph has a MET of 9.8: 9.8 × 70.3 × 0.5 = 344 calories. Weight training (moderate effort, MET 3.5): 3.5 × 70.3 × 0.333 = 82 calories. Total: 426 calories. Her fitness tracker said 610 — a 43% overestimate.
Why do fitness trackers overestimate caloric burn?
Most fitness trackers use heart rate + proprietary algorithms that tend toward overestimation — likely because it motivates users to continue using the device. They often don't adequately account for the difference between cardiovascular exercise (where heart rate correlates better with caloric burn) and resistance training (where heart rate elevation poorly predicts actual burn).
What is a MET value and how is it measured?
MET (Metabolic Equivalent of Task) is the ratio of an activity's metabolic rate to resting metabolic rate (1 MET = ~1 kcal/kg/hr). MET values are measured using indirect calorimetry — measuring oxygen consumption during activity in a laboratory. The Compendium of Physical Activities (Ainsworth et al.) is the authoritative database of MET values updated periodically since 1993.
Does the MET formula account for fitness level?
Partially. MET values are measured in representative populations, but fit individuals burn fewer calories doing the same activity at the same perceived effort — because their bodies are more efficient. However, fit individuals can sustain higher absolute intensities, often exceeding the standard MET for an activity. For most practical purposes, MET estimates are a reasonable approximation.
Should I add calories burned from exercise to my daily intake?
This 'exercise to eat' approach can work but is easy to overdo. Exercise caloric burn is often significantly less than people believe, and compensatory eating (eating back all exercise calories and then some) is a common reason people don't lose weight despite consistent exercise. A more reliable approach: set a caloric target based on your total daily energy expenditure (TDEE) including activity, rather than eating back specific workout burns.