What this running calorie calculator does
This calculator estimates calories burned during running using the MET (Metabolic Equivalent of Task) formula - the gold standard used by exercise physiologists and the 2011 Compendium of Physical Activities. Enter your body weight and how long you exercised; the calculator multiplies the activity's MET value by your weight (kg) and time (hours) to estimate kcal burned. Higher intensity = higher MET = more calories burned per minute.
Intensity guide for accurate results
Pick the intensity that matches what you actually did - not what you wished you did. Each running intensity has a specific MET value from peer-reviewed research. If you alternated paces (e.g., interval training), pick the average. For more precise tracking, use a heart rate monitor and the Heart Rate Calorie Calculator on HisabWeb - it accounts for individual cardiovascular response, which the MET method approximates.
What is MET (Metabolic Equivalent)?
MET = the energy cost of an activity relative to sitting quietly. 1 MET ≈ 3.5 mL O2 per kg of body weight per minute, or approximately 1 kcal per kg per hour at rest. Sitting = 1 MET; walking slowly = ~2.5 MET; running fast = ~13 MET. The Compendium of Physical Activities (Ainsworth et al., 2011) catalogs 821 activities with their MET values from oxygen-consumption studies. Multiplying MET × weight × time gives a robust calorie estimate for adults.
Why body weight matters
Heavier bodies burn more calories doing the same activity - more mass to move means more energy. A 90 kg person burns ~29% more calories than a 70 kg person doing the same workout. The MET formula scales linearly with weight, so accurate weight input is critical. Tip: use your current weight, not your goal weight, for the most realistic estimate.
Accuracy & limitations
MET estimates typically come within ±15-20% of metabolic-cart-measured values for moderate-intensity activities. Sources of variability: individual VO2max, body composition (more muscle = higher BMR), exercise efficiency (trained athletes burn fewer calories at the same speed), terrain, equipment, and even temperature. For more precision, use a heart-rate-based estimate (Keytel formula) or a metabolic cart in a lab.
Frequently asked questions
Roughly 350-500 kcal for an average adult, depending on weight and pace. The classic rule of thumb is ~1 kcal per kg of body weight per km - so a 70 kg runner burns ~350 kcal per 5K. Faster paces don't dramatically increase per-km burn because the formula scales mostly with distance, not speed.
Running burns more TOTAL calories per minute - so more fat in absolute terms. The 'fat-burning zone' myth (60-70% HRmax) is about the PROPORTION of fat vs carbs, not total fat burned. For pure fat loss, a 30-minute hard run usually burns more fat than 60 minutes of slow walking.
MET values rise with running pace: jog (4 mph) = 7.0 MET, moderate (6 mph) = 9.8 MET, fast (7 mph) = 11.0 MET, very fast (9 mph) = 12.8 MET, race pace (10 mph) = 14.5 MET. So doubling pace from 4 to 8 mph nearly doubles per-minute calorie burn at the same weight.
Sources
- 2011 Compendium of Physical Activities: A Second Update of Codes and MET Values— Ainsworth et al., Medicine & Science in Sports & Exercise, 2011;43(8):1575-1581
- Physical Activity Guidelines for Americans (2nd edition)— US Department of Health and Human Services
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