How Many Calories Burned Running 5 km?

kcal for a 70 kg adult

In 2004, Cara Hall and colleagues at Syracuse University put runners on a treadmill connected to indirect calorimetry — the gold standard for measuring metabolic cost — and found that the net energy cost of running was approximately constant per kilometre, regardless of pace, across the range most amateurs actually run. Their headline figure was 1.036 kcal per kilogram per kilometre.

The intuition is straightforward once you see it. Faster running burns more calories per minute. But faster running also takes fewer minutes to cover the same distance. The two effects cancel almost exactly, at least until you reach near-sprint speeds (above roughly 15 km/h), where aerodynamic drag and biomechanical inefficiency start to bend the curve.

For a 70 kg adult, the formula gives about 363 kcal for 5 km of running — at any sensible pace. Cut your pace from 6:00/km to 5:00/km and you'll save ten minutes, not 50 calories. That's worth knowing before you trust your watch's enthusiastic readout.

Pace still matters for plenty of other reasons: VO₂max gains, fat-vs-carbohydrate oxidation mix, EPOC magnitude, weekly time budget. Just not for the calories-per-5km number itself.

kcal ≈ 1.036 × weight (kg) × distance (km)

Net energy cost above resting metabolism. Hall et al. 2004.

Plug in your weight, multiply by five for a 5 km run, and you're done. For walking, swap the constant to 0.66 — the same Hall team measured walking at about 64% of the cost of running over identical ground.

The formula's limits matter. It assumes road or treadmill, flat ground, and steady-state running. It ignores the modest BMR you'd burn anyway by being alive for those 25–35 minutes (call that ~30 extra kcal — that's why apps quote a "gross" number rather than this "net" one). It doesn't account for sprint paces, altitude, or wind.

Within ordinary ranges, though, it's accurate to within a few percent — far better than any wrist tracker. The widget above uses this formula, multiplied by a terrain factor for hills and trails.

Body weight aside, four variables genuinely shift your 5 km burn:

• Gradient. A rough rule of thumb is +5% burn per 1% of incline averaged over the run. A genuinely hilly 5 km (say, averaging 5% uphill across half the distance) can add 15–25% to total burn.
• Surface. Lejeune, Willems and Heglund found in 1998 that running on soft sand costs about 1.6 times road running — substrates that absorb force make you put more work in to maintain pace. Snow, mud and unkept trails sit somewhere between road and sand.
• EPOC (the afterburn effect). Post-exercise oxygen consumption adds 5–15% to total energy expenditure depending on intensity. A 5 km of intervals or hill repeats will produce a meaningful bump; a steady jog at conversational pace, barely any. The internet claims that EPOC "lasts 48 hours and burns hundreds of calories" are oversold by a wide margin.
• Cold. Running below about 5°C adds 5–10% via cold-induced thermogenesis. Real, but minor — and the effect shrinks once you're well-clothed and warmed up.

Note what's not on this list: heart-rate zone, "fasted state", "the fat-burning window". These influence what your body uses as fuel, not how much total energy it burns over the 5 km.

Common wisdom — repeated in fitness magazines, app coaching, and casual conversation — is that running burns roughly twice as many calories as walking over the same distance. The Hall measurements say otherwise: running costs about 1.6 times walking per kilometre, not 2. Walking, it turns out, is surprisingly efficient.

Why does the myth persist? Because runners burn more per minute than walkers do, and people mentally combine that with "running is harder" to land on 2×. The honest picture: per minute, yes — running is roughly 2.5× walking. Per kilometre, only about 1.6×.

Practical implication: if you have an hour and want maximum calorie burn, run. If you have a fixed distance to cover and don't mind taking longer, the choice barely matters energetically — and walking is far easier on the knees, ankles, and hips. The widget above shows both numbers side by side for your weight.

Doubling your running pace, over the same 5 km, changes your total calorie burn by:

Hall, C., Figueroa, A., Fernhall, B., & Kanaley, J.A. (2004). "Energy expenditure of walking and running: comparison with prediction equations." Medicine & Science in Sports & Exercise, 36(12), 2128–2134 — source of the 1.036 kcal/kg/km running constant and the walking comparison.

Shcherbina, A., Mattsson, C.M., Waggott, D., et al. (2017). "Accuracy in wrist-worn, sensor-based measurements of heart rate and energy expenditure in a diverse cohort." Journal of Personalized Medicine, 7(2), 3 — the Stanford fitness-tracker accuracy study.

Lejeune, T.M., Willems, P.A., & Heglund, N.C. (1998). "Mechanics and energetics of human locomotion on sand." Journal of Experimental Biology, 201, 2071–2080 — sand-vs-road running cost.

Margaria, R., Cerretelli, P., Aghemo, P., & Sassi, G. (1963). "Energy cost of running." Journal of Applied Physiology, 18(2), 367–370 — the foundational measurement that Hall et al. later refined.