Running Calories Calculator
Estimate the calories you burn on a run from your body weight, distance and pace, using the well-known ~1 kcal per kg per km relationship.
How it works
calories ≈ weight(kg) × distance(km) × factor · factor ≈ 1.036 + 0.004 × (mph − 6)
The energy cost of running is dominated by how far you move your body mass, not how fast — which is why the durable rule of thumb is about 1 kcal per kilogram of body weight per kilometre. Heavier runners and longer runs burn proportionally more. Pace matters only a little for the gross cost per distance, so this calculator adds a small refinement above 6 mph rather than pretending speed changes everything.
Worked example
A 160 lb runner is 160 × 0.4536 = 72.6 kg, and 5 miles is 5 × 1.609 = 8.05 km. At 6 mph the factor is 1.036, so calories = 72.6 × 8.05 × 1.036 ≈ 605 kcal — about 121 kcal per mile.
Frequently asked questions
Is it really the same calories whether I run fast or slow?
For the gross cost per distance, nearly — a mile costs roughly the same energy at most paces because you move the same mass the same way. Faster running adds a little, and it obviously burns more per minute, but per mile the difference is small.
Does this include the calories I would have burned anyway?
This is gross energy expenditure. Your body would use some calories at rest during that time, so the true extra cost of the run is a little lower. For weight-management math, most people use the gross figure and accept the small overcount.
Why does weight matter so much?
Running is weight-bearing — every stride lifts and lowers your whole body against gravity. Double the mass and you roughly double the energy to move it the same distance, which is why the formula multiplies straight by kilograms.
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Estimates for general fitness and education — individual results vary with terrain, fitness, technique and measurement error. Not medical advice.