How many calories did you really burn during your 45-minute weightlifting session, 30 minutes of swimming, or an afternoon of gardening? Without understanding metabolic equivalents, estimating workout expenditure is pure guesswork. The global clinical standard for quantifying exercise energy expenditure is the Compendium of Physical Activities developed by Dr. Barbara Ainsworth. The system assigns a precise Metabolic Equivalent of Task (MET) value to hundreds of human activities. The Calories Burned Calculator utilizes the official Ainsworth MET compendium to compute your exact caloric burn across any physical pursuit.
The Mathematical Biomechanics of the MET System
One MET is biologically defined as the resting metabolic rate of an average seated human adult, consuming approximately 3.5 mL of oxygen per kilogram of body mass per minute (equivalent to roughly 1.0 kcal per kilogram per hour):
Calories Burned = MET Value × Weight in kg × Duration in Hours- If an 80 kg individual engages in an activity rated at 6.0 METs for 45 minutes (0.75 hours):
Calories Burned = 6.0 × 80 kg × 0.75 hours = 360 kcal
Standard MET Values Across Common Activities
| Activity / Exercise | Official MET Value | Burn (70 kg Person / 1 Hr) | Intensity Tier |
|---|---|---|---|
| Sitting at Desk / Computer | 1.3 METs | ~91 kcal | Sedentary |
| Hatha Yoga / Gentle Stretching | 2.5 – 3.0 METs | ~175 – 210 kcal | Light Physical Activity |
| Brisk Walking (5.5 km/h) | 3.8 METs | ~266 kcal | Moderate Aerobic |
| Resistance Training (Dumbbells & Barbells) | 5.0 – 6.0 METs | ~350 – 420 kcal | Moderate-to-Vigorous |
| Swimming (Moderate Front Crawl) | 7.0 – 8.0 METs | ~490 – 560 kcal | Vigorous Aerobic |
| Running (10 km/h / 6 mph) | 9.8 METs | ~686 kcal | High-Intensity Aerobic |
| Jumping Rope (Vigorous) | 11.0 – 12.3 METs | ~770 – 860 kcal | Maximum Anaerobic Conditioning |
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