Calories Burned Calculator Guide: How Exercise Calorie Estimates Work

How Calories Burned Is Calculated

Calorie expenditure during exercise is most commonly calculated using MET values (Metabolic Equivalent of Task) combined with body weight and duration. The formula is:

Calories burned = MET × body weight (kg) × duration (hours)

Example: Running at 6 mph (MET ≈ 10) for 30 minutes (0.5 hours) at 70 kg body weight: 10 × 70 × 0.5 = 350 calories.

This formula gives gross calorie burn — the total energy expended, including the calories you would have burned resting. Net calorie burn (exercise-only) subtracts resting metabolic rate (approximately 1 MET or ~1 kcal/kg/hour). For most tracking purposes, gross burn is what apps and calculators report.

Use our calories burned calculator to get accurate results across dozens of activities, with proper adjustment for your body weight. Pair this with our TDEE calculator to understand how exercise fits into your total daily calorie picture.

MET Values Explained

A MET value represents the ratio of the metabolic rate during an activity to the resting metabolic rate. MET = 1 means sitting at rest. MET = 10 means the activity requires 10 times the energy of sitting still.

MET values are published in the Compendium of Physical Activities (Ainsworth et al., updated 2011) — the authoritative reference database with over 800 coded activities. Each activity has a standardized MET that has been measured or estimated from indirect calorimetry studies.

Calories Burned by Activity (70 kg / 154 lb Person, 30 Minutes)

Why Body Weight Is the Most Important Variable

Body weight is the primary multiplier in the calorie burn formula. A 90 kg person burns 29% more calories than a 70 kg person doing the exact same activity at the exact same intensity for the same duration — simply because moving more mass requires more energy.

This has a counter-intuitive implication for weight loss: as you lose weight, you burn fewer calories doing the same workouts. A 10 kg weight loss reduces workout calorie burn by ~11%. This is one reason weight loss progressively slows — both the calorie burn from exercise and resting metabolic rate both decrease as total mass decreases.

Recalculate your TDEE and calorie targets periodically as your weight changes. Our TDEE calculator accounts for current body weight.

Cardio vs. Lifting: Which Burns More Calories?

Per session, moderate-to-vigorous cardio consistently burns more calories than strength training. A 30-minute run at 6 mph burns ~350 cal; a 30-minute lifting session burns ~210 cal for a 70 kg person. However, the comparison changes when you account for the full picture:

• Afterburn (EPOC): High-intensity lifting and HIIT produce elevated post-exercise oxygen consumption for 12–48 hours. This adds 6–15% to the total energy cost of a strength session.
• Muscle mass increases RMR: Each kg of added muscle increases resting metabolic rate by approximately 6–10 kcal/day. 5 kg of added muscle adds ~30–50 kcal/day passively.
• Total weekly volume: Cardio can be performed daily; strength training typically requires rest days. Weekly calorie deficit is what matters for body composition, not per-session burn.

Combine our calories burned calculator with our pace calculator to optimize cardio sessions for target duration and intensity.

NEAT: The Hidden Calorie Burn

NEAT (Non-Exercise Activity Thermogenesis) is the energy expended in all physical activity that is not deliberate exercise — standing, walking between rooms, fidgeting, cleaning, grocery shopping, and similar daily movement. It is the most variable component of total daily energy expenditure and accounts for more daily calorie variation between individuals than formal exercise.

Research shows NEAT varies by up to 2,000 kcal/day between individuals at the same weight and same deliberate exercise volume. A sedentary desk worker and a physically active barista with the same BMI can have total daily energy expenditures that differ by 800–1,200 kcal — almost entirely from NEAT.

• Standing burns ~100 more kcal/day than sitting (MET 1.3 vs 1.0)
• 10,000 steps/day burns ~400–500 kcal more than 3,000 steps/day
• Fidgeting and spontaneous movement can add 300–400 kcal/day in high-NEAT individuals

Increasing daily steps is one of the highest-ROI weight management interventions because it adds calorie burn without the recovery cost of formal exercise. Track step-to-distance conversion with our steps to miles calculator.

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