Running Calorie Burn Calculator
Estimate the calories you burn on any run by entering your weight, distance, pace, and terrain type. Useful for fueling decisions, weight management, and post-run nutrition planning.
Last updated: September 2026
Formula below · 1 source (Wikipedia) · Updated Sep 2026
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About this calculator
Caloric expenditure during running depends mainly on body mass and distance covered, with smaller effects from speed and surface. This calculator uses the ACSM metabolic equation for running (VO2 = 0.2 × speed in m/min + 3.5 ml/kg/min), which, at about 5 kcal per litre of oxygen, works out to calories = weight × distance × (1 + 0.0175 × paceMinKm) × terrainMultiplier, with weight in kg, distance in km and pace in minutes per km. The "1" is the energy needed to carry each kilogram one kilometre on level ground - nearly independent of speed - and 0.0175 × pace is resting metabolism accrued during the minutes spent on each kilometre, so the result is a gross figure of about 1.05-1.15 kcal per kg per km on the flat. Terrain multipliers are approximate allowances for grade and surface: 1.0 flat road, 1.15 rolling hills, 1.2 trail/dirt and 1.3 steep hills. Subtract about 1 kcal per kg per hour of running for net exercise calories. Typical accuracy is ±10-15% versus measured oxygen uptake.
How to use
Example: a 70 kg runner completes 10 km at a pace of 6 min/km on trail/dirt terrain. Step 1: cost per km → 1 + 0.0175 × 6 = 1.105 kcal/kg/km. Step 2: base product → 70 × 10 × 1.105 = 773.5 kcal. Step 3: apply trail/dirt multiplier (1.2) → 773.5 × 1.2 ≈ 928 kcal. The same run on a flat road would be about 774 kcal; at 5 km and 5.5 min/km on the flat (the default inputs) the result is 70 × 5 × 1.096 ≈ 384 kcal.
Frequently asked questions
How does running pace affect calories burned per kilometre?
Faster running burns more calories per minute but the difference per kilometre is smaller than many people expect. At a slow pace, you spend more time covering each kilometre, so the higher duration partially offsets the lower intensity. The (60 / paceMinKm) term in this formula captures that time-speed relationship. Research shows that net calorie cost per kilometre is relatively stable across moderate paces but rises noticeably at very high speeds due to the disproportionate increase in mechanical and metabolic work. In practical terms, an elite runner and a recreational jogger covering the same 10 km will burn roughly similar total calories, though the elite runner finishes far sooner.
Why does running on hills or trail burn more calories than flat road running?
Uphill running requires your muscles to perform additional work against gravity, increasing oxygen demand and heart rate significantly above flat-ground equivalents. Trail surfaces add instability, forcing constant micro-corrections from stabiliser muscles throughout each stride. Collectively these factors are captured by terrain multipliers: rolling hills add 15%, trail/dirt adds 20%, and steep hills add 30% to the flat-road calorie estimate. If your route mixes terrain types, a blended multiplier between 1.0 and 1.3 gives a reasonable approximation.
How accurate are running calorie calculators compared to a heart rate monitor?
Formula-based calculators like this one are accurate within roughly 10–15% for most recreational runners under steady-state conditions. They use population-average metabolic constants, so individual variation in running economy, fitness level, and body composition introduces error. Heart rate monitors estimate calories through a different proxy—cardiac output—and can be more responsive to real-time intensity changes, but they too carry errors of 10–20% without lab calibration. For practical purposes such as fueling decisions or general weight management, either method is sufficiently accurate. For clinical or performance nutrition precision, indirect calorimetry in a lab setting remains the gold standard.