// Weight-Loss Calculators

Calories Burned Running

An hour at 6:00 per kilometre costs a 75 kg runner about 829 kcal. Change the three inputs below for yours.

Your details

Your result

Calories burned
829kcal
Realistic range
704–953kcal
Distance covered
10km
Cost per kilometre
83kcal
Speed
10 km/h
Intensity
10.5 MET
  • Calculated from the ACSM running equation. The per-kilometre figure is the more stable of the two — it barely moves with pace, because a faster run covers the same ground in less time.
  • This is a gross figure: it includes the calories you would have burned sitting still for the same time.

Estimates are for general guidance only and are not medical advice. For a personalised plan, book a free guided tour at RPM Gym.

What your result means

For a 70 to 85 kg runner holding somewhere between 5:30 and 6:30 per kilometre, an hour lands between 720 and 1,017 kcal. Bodyweight moves that spread more than pace does, which is the first clue about what this equation is really counting.

The per-kilometre number is the one to keep. Ten kilometres costs a 75 kg runner 803 kcal if it takes forty minutes and 816 kcal if it takes fifty — thirteen kilocalories apart, under two percent, for ten minutes more work. Speeding up changes how long you spend out there and almost nothing else about the bill.

That is not a quirk of the tool. The ACSM equation charges 0.2 millilitres of oxygen per kilogram per metre covered, and a metre is a metre whatever speed you cross it at. Convert that and the running portion of a kilometre comes to almost exactly one kilocalorie per kilogram of bodyweight: 75 kcal for a 75 kg runner, 90 for a 90 kg one, every kilometre, at any pace in the range.

So the only part of the per-kilometre figure that moves with pace is the resting term — the 3.5 mL/kg/min the model says you would be burning anyway. Run slower and you sit inside that clock for longer, which is why the fifty-minute ten kilometres reads slightly higher, not lower.

Practically: distance is the lever for energy, pace is the lever for fitness. They are different arguments and this calculator only answers the first one.

How it is calculated

ACSM running metabolic equation

Speed (m/min) = 1000 ÷ pace (min/km) VO2 (mL/kg/min) = 3.5 + (0.2 × speed) + (0.9 × speed × grade) kcal = VO2 × body weight kg ÷ 1000 × 5 kcal per litre of oxygen × minutes Grade is held at zero: this page models level running, and incline belongs to the treadmill calculator.

What it assumes

  • The pace you enter is your average over the whole run, held on level ground. The distance term is linear, so a run that drifted from 6:10 to 5:40 and averaged 5:55 is described about as well as a metronomic one.
  • The published running equation is anchored from roughly 8 km/h upwards, which is 7:30 per kilometre. Enter something slower and you are in the band where a jog and a fast walk overlap, and the equation is working below the speeds it was fitted to.
  • Five kilocalories per litre of oxygen is the value for burning mostly carbohydrate. At an easy conversational pace you use proportionally more fat, where the true figure is closer to 4.7, so the estimate reads a few percent high at the slow end of the range.
  • Nothing about air resistance, wind, camber, sand or your own running economy is in the model. Two runners of identical mass at identical pace can differ by several percent in measured oxygen cost, and this equation cannot see that difference.

Units and rounding

  • Weight in kilograms, duration in minutes, pace in minutes per kilometre entered as a decimal — 5:45 goes in as 5.75, and 6:15 as 6.25.
  • Speed and distance are both derived from the pace, so the kilometres shown here will not match a GPS trace exactly.
  • Cost per kilometre is the total divided by that derived distance, so it is only as good as the pace you gave it.

Worked example

An 82 kg runner holds 5:45 per kilometre for a full hour.

  1. Pace 5:45 = 5.75 min/km, so speed = 60 ÷ 5.75 = 10.4 km/h = 173.9 m/min
  2. VO2 = 3.5 + (0.2 × 173.9) = 38.28 mL/kg/min, which is 38.28 ÷ 3.5 = 10.9 MET
  3. kcal = 38.28 × 82 ÷ 1000 × 5 × 60 = 942
  4. Distance = 10.4 km
  5. Cost per kilometre = 942 ÷ 10.4 = 90 kcal

About 942 kcal for the hour, or 800 to 1,083 once the error band is honoured, and 90 kcal for every kilometre covered. Split that 90: exactly 82 of it is the running, and the other 8 is the hour of existing that ran alongside it.

Limitations

  • The equation reads high. Ruiz and Sherman measured the oxygen cost of running against it in 33 people and it overestimated in 29 of them, significantly across the group. Take the figure as the top of a plausible band rather than a measurement, and prefer the range the tool prints beside it.
  • Two overestimates stack here, in fact. Alongside the equation itself, the 3.5 mL/kg/min resting anchor every MET value is built on is generous for most adults, and it is the term doing all of the pace-dependent work in your per-kilometre figure.
  • This is a gross number. Of an hour's 829 kcal at 75 kg, 79 are what the model says you would have spent sitting in a chair. Subtract them if you want the price of the run alone.
  • Below 7:30 per kilometre the running equation is extrapolating. A slow jog sits in the gap between the walking and running equations, neither of which was fitted there, and the two disagree sharply across it.
  • Hills, trail, soft sand and a headwind all cost more than the model allows, and none of them is an input. A corniche loop and a dune run at the same pace are not the same run.
  • Heat does not raise the energy cost of covering ground in proportion to how much harder it feels. A run in August will show a much higher heart rate at the same pace; that is thermoregulation, not extra kilometres in the bank.

What to do next

  • Learn your per-kilometre figure and stop opening calculators. It is roughly your bodyweight in kilocalories, plus about 1.75% of your bodyweight for each minute the kilometre takes.
  • If you want a run to cost more, add kilometres rather than pace. The arithmetic says so plainly, and so does the recovery cost of the alternative.
  • Use the bottom of the printed range if you are logging this against food. An estimate that runs high and a food diary that runs low are errors pointing the same way.
  • Decide the pace before the run rather than after it. Working out the finish time a target pace produces is a separate job and a separate tool.
  • If the same session on a treadmill gives a different figure, the missing variable is almost always the incline setting, which this page holds at zero.

Sources

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Time, Pace, DistanceVO2 MaxTreadmill CaloriesHeart Rate ZoneCalorie DeficitWeight Loss Timeline
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// Frequently Asked

Questions, answered.

How many calories does 1 hour of running burn?

Between about 700 and 1,000 kcal for a 70 to 85 kg adult running 5:30 to 6:30 per kilometre. Lighter and slower drops it well below that — a 58 kg runner at 7:00 per kilometre is nearer 558 — and 90 kg at 5:00 per kilometre pushes past 1,150.

Do you burn more calories running faster?

Per minute, clearly. A 75 kg runner spends about 13.8 kcal a minute at 6:00 per kilometre and 16.3 at 5:00. Per kilometre it is close to a wash: 83 kcal against 82. The faster runner is buying time back, not energy.

How many calories are in a 5K?

Roughly five times your bodyweight in kilocalories, plus a little for the time on your feet. A 70 kg runner covering 5 km in 30 minutes lands on 387 kcal — 350 of that is the five kilometres and the rest is the half hour.

Is running or walking better for burning calories?

Per minute running wins comfortably: about 13.8 kcal a minute at 10 km/h for a 75 kg adult against roughly 5.1 walking briskly at 6 km/h. Per kilometre the gap narrows to 83 against 51, because the walk takes nearly twice as long to cover the same ground.

Why does my running watch show a different number?

It measures distance by GPS rather than deriving it from a pace you typed, it usually blends in heart rate, and many apps report net rather than gross energy. Several of them also apply a personal calibration built from your own history. Different method, different number, both estimates.

Does it matter that my pace varied through the run?

Very little. Enter your true duration and your true average pace and the derived distance is your real distance, and since the dominant term is charged per metre the total barely notices how those metres were distributed. That is the same stability that makes the per-kilometre figure worth remembering.

Is one calorie per kilogram per kilometre a real rule?

It falls straight out of this equation once the resting term is removed, and it is why the per-kilometre figure sits so close to your bodyweight. Your own running economy may sit above or below the population average the equation was fitted to, and nothing on this page can tell you which.

Kilometres are the bill. Pace is only how fast you pay it.

If the weekly mileage is climbing and your legs give out before your lungs do, the missing piece is usually strength work rather than more running. Book a free guided tour at RPM Gym in Al Manhal.

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