Calories Burned Calculator
Calories Burned Calculator - Exercise Calorie Counter
Calories Burned
238
in 30 minutes
Food Equivalents
How This Calculator Works
MET Formula
Calories burned = MET × weight (kg) × duration (hours). MET (Metabolic Equivalent of Task) is a standardized measure of exercise intensity. Sitting has a MET of 1.0 (your baseline). Walking at 3.5mph is 3.5× your resting metabolism. Running at 6mph is 9.8×. The formula was developed by the American College of Sports Medicine and is used in clinical and research settings worldwide.
Why Weight Matters
Heavier people burn more calories doing the same activity because they move more mass. A 200lb person burns about 33% more calories than a 150lb person during identical workouts. This means weight loss becomes slightly harder as you lose weight — your calorie burn per workout decreases. The calculator automatically adjusts for this.
Walking vs Running
Surprisingly, running and walking burn similar calories per mile — running just gets you there faster. A 150lb person burns about 80 calories per mile whether walking or running. Running burns more per hour (higher MET), but the per-mile calorie burn is similar because you cover more distance. For fat loss, both are effective — the best exercise is the one you'll actually do consistently.
Strength Training Calorie Burn
Weight training has a MET of ~5.0 during the session but provides significant afterburn (EPOC — Excess Post-Exercise Oxygen Consumption). You continue burning elevated calories for 24-48 hours as muscles repair. This afterburn can add 50-200 calories beyond what this calculator shows. Muscle tissue also burns 3× more calories at rest than fat tissue, improving long-term metabolism.
HIIT vs Steady State
HIIT (High-Intensity Interval Training) has a MET of 8.0+ and creates significant EPOC. A 20-minute HIIT session can burn similar total calories (including afterburn) to a 45-minute moderate jog. HIIT also improves cardiovascular fitness more efficiently. However, steady-state cardio is more sustainable for daily exercise and has lower injury risk.
Creating a Calorie Deficit
To lose 1 pound of fat per week, you need a 3,500-calorie weekly deficit — about 500 calories per day. Exercise contributes to this deficit but diet is more efficient (it's much easier to not eat 300 calories than to burn them). A balanced approach: mild dietary restriction (300-400 cal/day) + exercise (200-300 cal/day burn) is more sustainable than aggressive restriction or excessive cardio alone.
Frequently Asked Questions
How many calories does walking burn?+
A 150lb person burns about 80-100 calories per 30 minutes of walking at moderate pace (3.5mph), or about 260-320 calories per hour. Weight significantly affects this — a 200lb person burns about 130 calories per 30 minutes at the same pace.
Does running burn more calories than walking?+
Per hour, yes — running burns 2-3× more calories than walking. But per mile, they burn similar amounts. Running at 6mph covers 6 miles per hour vs walking 3.5 miles — so running burns about 2× more per hour but only slightly more per mile covered.
How accurate are calorie burn estimates?+
The MET formula is accurate within ±10-20% for most people. Fitness level, age, temperature, and terrain all affect actual burn. Highly fit individuals burn fewer calories for the same activity (higher efficiency). Wearable devices add heart rate data for better accuracy but still have ±15% margin.
What activity burns the most calories?+
Per hour: jumping rope (800-1000 cal), running at 8mph (900+ cal), and rowing (600-800 cal) top the list. For sustainability and muscle retention, strength training combined with cardio is optimal. HIIT (8+ MET) is the most time-efficient option for fat loss.
Deep Dive: MET Values and Exercise Science
The Metabolic Equivalent of Task (MET) is the foundational unit for quantifying physical activity intensity. One MET equals 3.5 mL of oxygen per kilogram of body weight per minute — the approximate resting metabolic rate of an average adult. Activities are assigned MET values relative to this baseline: sleeping is 0.95 MET, walking at 3.5 mph is 4.3 METs, running at 6 mph is 9.8 METs, and vigorous cycling above 20 mph is 16 METs. To estimate calories burned: Calories = MET × weight_kg × duration_hours. A 70kg person running at 6 mph for 30 minutes burns approximately 70 × 9.8 × 0.5 = 343 calories.
The Compendium of Physical Activities, first published by Barbara Ainsworth and colleagues in 1993 and updated through 2011, is the authoritative reference for MET values across 800+ activities. It was developed to standardize physical activity measurement in epidemiological research, enabling comparison across studies that previously used inconsistent classification systems. The compendium doesn't account for individual fitness level — a trained runner burns fewer calories per kilometer than a beginner because efficient movement reduces oxygen cost. Elite athletes have lower MET values for the same speed as untrained individuals.
Fitness tracker accuracy for calorie burn is notoriously unreliable. A 2017 Stanford study tested seven popular wrist devices and found calorie expenditure errors ranging from 27% to 93%. Heart rate estimates were relatively accurate; calorie calculations built on top of them were not. The primary source of error is the conversion from heart rate to caloric burn — this relationship is individual and context-dependent, varying with fitness level, temperature, humidity, and stress. Trackers calibrate these algorithms to population averages, creating systematic bias for anyone diverging from the mean.
Excess Post-Exercise Oxygen Consumption (EPOC) — the 'afterburn effect' — is real but often overstated in marketing. EPOC represents elevated metabolism post-exercise as the body restores oxygen stores, removes lactate, reduces body temperature, and repairs muscle tissue. High-intensity interval training (HIIT) produces larger EPOC than steady-state cardio: a 2011 European Journal of Applied Physiology study found HIIT produced 6-15% higher EPOC. However, absolute EPOC magnitude is modest — typically 50-200 extra calories, not the 500-hour-long burn rates some fitness marketers claim. HIIT's primary caloric advantage is higher intensity during the workout itself.