Exercise Calorie Burn Calculator

Estimate calories burned during exercise based on body weight, activity type, and duration using MET values.

Results

Visualization

How It Works

The MET-based calorie burn estimate is a population-average rule of thumb, not a personal-fitness measurement. The 2011 Compendium of Physical Activities (Ainsworth et al., Med Sci Sports Exerc) catalogs MET values for ~800 activities, where 1 MET = ~3.5 ml O2/kg/min ≈ 1 kcal/kg/hr at rest. Real expenditure deviates by ±20-30% based on technique, fitness, terrain, and most importantly, body composition (the formula treats lean and fat tissue identically when in reality muscle burns ~3x more during exercise). Smartwatch and chest-strap estimates that incorporate heart rate are still off by 15-25% on average (Shcherbina et al., J Pers Med 2017, n=60 across 7 devices). Use any kcal estimate as a relative comparison between activities, not as absolute truth.

The Formula

Calories_Burned = (MET * Weight_kg * 3.5 / 200) * Duration_min; where 3.5 ml O2/kg/min is the 1-MET resting oxygen consumption baseline

Variables

  • MET — Metabolic Equivalent — sample values: walking 3.0 mph = 3.5, jogging 5 mph = 8.3, running 6 mph = 9.8, cycling 14-16 mph = 10, swimming freestyle moderate = 8.3
  • Weight_kg — Body mass in kg — heavier subjects burn linearly more for weight-bearing activities, less so for cycling/swimming
  • 3.5 — Resting O2 consumption in ml/kg/min (1 MET reference) — slightly overestimates true RMR for many adults (actual ~2.6-3.2)
  • 200 — Conversion: ml O2 to kcal at RER 0.85, then per minute
  • EPOC — Excess post-exercise oxygen consumption — 5-15% additional burn after high-intensity sessions, not captured by MET formulas

Worked Example

75 kg lifter jogging 30 min at 6 mph (MET 9.8). Burn = (9.8 * 75 * 3.5 / 200) * 30 = 386 kcal. The same lifter walking 30 min at 3.5 mph (MET 4.3) burns 169 kcal — less than half. Add a 10% EPOC bump for a vigorous run: 425 kcal total. For weight-bearing comparison, 75 kg vs 60 kg jogger at the same pace: 386 vs 309 kcal (25% more burn for the heavier athlete).

Practical Tips

  • Wearables overstate kcal during cardio. Stanford's 7-device study (Shcherbina 2017) found mean error of 27% for energy expenditure across Apple Watch, Fitbit, Garmin, and others — even though heart rate accuracy was within 5%. Use device kcal as a rough trend, not a budget input.
  • Resistance training MET values (3-6) understate fat-loss value because the formula doesn't capture EPOC, which is 6-15% of session calories for hypertrophy work and up to 20% for heavy compound sessions (LaForgia et al., J Sports Sci 2006). Net 24-hour burn from a hard lifting session beats the formula by ~50-100 kcal.
  • Don't use exercise burn to 'unlock' food. A 30-min jog at 6 mph burns ~390 kcal — a Starbucks venti caramel macchiato is 460 kcal. Net effect: zero deficit, often surplus. Treat exercise as health/recomp, not a calorie-license.
  • For weight loss math, count ~50% of estimated exercise burn. Combined with wearable overestimation (~25%) and label tolerance on food (±20%), this margin gets you to actual energy availability. The Hand-Mead study (J Acad Nutr Diet 2014) found self-reported intake under-counts by ~20% on average — these errors stack against you.
  • Daily steps are the highest-leverage NEAT lever and are not in this calculator. 10,000 vs 5,000 steps for a 75 kg person is roughly 200-250 extra kcal/day at no training cost — bigger than most workout sessions on a per-week basis.
  • Cycling and swimming are weight-supported, so their MET burn scales less aggressively with body mass than running. A 100 kg cyclist burns only ~10-15% more than a 70 kg cyclist at the same wattage; a 100 kg runner burns ~40% more at the same pace.
  • Heart rate gives a personalized adjustment for steady-state aerobic work. The Keytel formula (Eur J Appl Physiol 2005) for kcal/min from HR + age + weight + sex is more accurate than MET when intensity is consistent (within ~10%); it breaks down for intervals and resistance work.

Frequently Asked Questions

Why does body weight matter for calorie burn?

Most movement work scales with mass — a heavier body requires more energy to translate vertically (running, climbing, plyometrics) and to maintain joint stability. For weight-supported activities (cycling, swimming, rowing on a sliding seat) the relationship is weaker because the apparatus carries the weight. The formula uses linear scaling, which over-credits heavy individuals on cycling and under-credits them on intervals.

How accurate is MET estimation?

±15-25% for population averages; up to 40% off for individuals at the tails. The Compendium values come from indirect calorimetry on small samples and assume average mechanical efficiency (~25%). Highly trained individuals are 3-5% more efficient (less burn per pace); deconditioned subjects can be 10% less efficient (more burn per pace).

Should I subtract resting metabolism from the result?

Technically yes for 'extra calories burned by exercise' — the MET formula includes the 1 MET you'd burn anyway sitting still. For a 75 kg person doing 30 min, that's 75 * 3.5 * 30 / 200 = ~40 kcal of baseline absorbed into the workout estimate. Practical answer: most people don't bother because the noise floor is bigger than the correction.

Does EPOC really matter for fat loss?

Mildly. EPOC adds 5-20% to a session's calorie cost depending on intensity, with HIIT and heavy lifting at the high end (Bahr & Sejersted, Metabolism 1991). A 400 kcal session might net 440-480 actual. Over a year that's noticeable, but day-to-day it's noise. Weekly total kcal still dominates fat loss outcome.

Why does my fitness watch say something different?

Most consumer wearables apply weight + age + HR to a proprietary curve and calibrate to public datasets. Stanford's 7-device study found error rates from 27-93% for energy expenditure (HR was much more accurate at 2-5% error). MET-based calc and watch-based calc both have errors that don't fully cancel — averaging them gets you closer to reality.

Does fasted cardio burn more fat?

Per-session yes, total fat over weeks no. Fasted cardio shifts substrate use toward fat oxidation during exercise (Schoenfeld, Strength Cond J 2011), but the body compensates over the next 24 hours by oxidizing more carbs, equalizing the math. For body composition, fed vs fasted cardio produces equivalent results when calories match (Schoenfeld et al., J Int Soc Sports Nutr 2014).

Walking vs running — what's the cost-per-distance ratio?

Almost equal. Walking at 3.5 mph burns roughly 100 kcal/mile for a 75 kg person; running at 6 mph burns ~110 kcal/mile (Wilkin et al., Med Sci Sports Exerc 2012). The big differences are time-efficiency (running is faster) and EPOC (running has more). For total daily burn, you can match a 30-min run with a 60-min walk and end up close.

Why does HIIT beat steady-state for fat loss?

Two reasons: higher per-minute burn during work intervals (12-15 METs vs 7-9 for jogging), and 2-3x more EPOC for 12-24 hours after (Boutcher, J Obes 2011). Trapp et al. (Int J Obes 2008) found 3x/wk HIIT for 15 weeks produced more fat loss than 3x/wk steady-state at equal session time, despite total kcal being lower in the HIIT arm.

Sources

Last updated: May 04, 2026 · Last reviewed: May 2026 — NutritionCalcs Editorial Team · About our methodology

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