Calories Burned Running Calculator
Calculate calories burned running from body weight and distance (0.72 kcal/kg/km).
How to use this tool
- Enter body weight and distance in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your calories burned and the full breakdown beneath it.
A widely-used rule of thumb is that running costs approximately 1 kcal per kg of body weight per km, regardless of pace. This is the gross metabolic cost; net cost (minus resting metabolism) is about 0.72 kcal/kg/km. This calculator uses the gross value (1 kcal/kg/km).
Formula
Calories per km (kcal/km) = body weight (kg) × 1.0
Total calories burned (kcal) = calories per km × distance (km)
This simplification reflects the well-established finding that the energy cost of running is approximately 1 kcal per kg per km regardless of pace.
How it works
This calculator applies the biomechanical rule-of-thumb that running costs roughly 1 kilocalorie per kilogram of body weight per kilometre travelled, a figure supported by multiple laboratory studies on treadmill and track running across a wide range of speeds.
The formula gives gross calorie expenditure and does not subtract resting metabolism; it is most accurate for steady-state running on flat terrain. Uphill running, very high speeds, or significant wind resistance can raise actual expenditure by 5–15% above this estimate.
Worked example
Worked example
- A 70 kg runner completes a 10 km run.
- Calories per km: 70 kg × 1.0 = 70 kcal/km.
- Total: 70 kcal/km × 10 km = 700 kcal.
Calories burned = 700 kcal; 70 kcal per km
Key terms
- Energy cost of running
- The amount of energy consumed per unit distance while running; approximately 1 kcal per kg per km at typical training paces on flat ground.
- Gross calorie expenditure
- Total energy used during exercise, including the baseline resting metabolic rate; what most fitness trackers report.
- Rule of thumb (1 kcal/kg/km)
- A simplified but empirically derived constant showing that running economy is relatively speed-independent: covering 1 km costs roughly 1 kcal per kg of body mass.
- Running economy
- The oxygen (and therefore energy) demand at a given running speed; a more economical runner uses less energy to cover the same distance.
Frequently asked questions
- Does pace affect calories burned running?
- Surprisingly little — the energy cost per km is almost constant across typical running speeds. Running faster gets you to the same calorie total in less time; pace mainly affects rate, not total cost per km.
- Why does heavier weight mean more calories?
- More mass requires more mechanical work to lift and propel with each stride. A 90 kg runner burns roughly 30% more per km than a 70 kg runner at the same pace.