What formula is used to calculate calories burned running?

The calculator uses the MET (Metabolic Equivalent of Task) formula: Calories = MET × weight in kg × duration in hours. MET values for running come from the Compendium of Physical Activities (Ainsworth et al., 2011) — a peer-reviewed database of exercise intensities. A slow jog has a MET of about 6, while a fast sprint reaches 19.

Why does body weight affect calories burned so much?

Running requires you to move your entire body mass against gravity with each stride. The heavier you are, the more energy that takes — which is why the MET formula multiplies directly by your weight in kg. A 90 kg runner burns roughly 29% more than a 70 kg runner at the same pace and duration.

How accurate is a MET-based calorie estimate?

MET values give a population-average estimate and are accurate to within roughly 10–15% for most people. Individual factors such as running economy, terrain, gradient, heat, and fitness level are not captured. For a more precise figure, a chest-strap heart-rate monitor combined with a validated HR-to-calorie algorithm tends to be the next step up without lab equipment.

Does running speed or distance matter more for calorie burn?

Both matter, but distance is the dominant factor at moderate intensities. Running 10 km at 8 km/h or at 12 km/h burns a similar number of calories, because you cover the same distance — the faster runner just does it in less time. Speed matters more at very high intensities (sprinting) where the MET rises steeply, burning significantly more per km.

How many calories does a 5 km run burn?

For a 70 kg runner at a moderate 6 mph (9.7 km/h) pace, a 5 km run takes about 31 minutes and burns roughly 300 kcal. At a brisk 7 mph the same distance burns around 320 kcal in 27 minutes. Use the calculator above and switch to Distance mode for your exact weight and speed.

Is running or walking more efficient for burning calories?

Running burns more calories per minute (higher MET), but walking at a steady pace burns a surprisingly similar number of calories per kilometre — because you cover the same distance, just more slowly. If your goal is total calorie burn and time is not a constraint, a brisk long walk is comparable to a short run. If you want to burn the most calories in a fixed time window, run faster.

Is my data stored anywhere?

Everything is calculated live in your browser. No data is sent to any server and nothing is saved unless you use the Copy button.

Calories Burned Running Calculator

Running is one of the most effective calorie-burning exercises available — no gym membership, no equipment, and you can do it almost anywhere. But the question “how many calories did I just burn?” depends on more than a single lookup table. Your body weight, your speed, and how long or how far you ran all combine to give a figure that can range from under 200 kcal for a short jog to well over 1,000 kcal for a long hard effort. This calculator works out the answer precisely, using the same methodology sports scientists use.

How it works

The calculation is based on the MET formula — the gold standard for estimating exercise energy expenditure:

Calories (kcal) = MET × weight (kg) × duration (hours)

MET stands for Metabolic Equivalent of Task. It expresses how many times harder an activity is than sitting completely still (which has a MET of 1.0). The values used here are drawn from the Compendium of Physical Activities (Ainsworth et al., 2011, updated 2024), a peer-reviewed database covering hundreds of activities and the standard reference for exercise science research worldwide.

Running MET values range from 6.0 at a slow jog (4 mph / 15 min/mile) up to 19.0 at a fast sprint (12 mph / 5 min/mile). The steep rise at higher speeds reflects the disproportionately greater oxygen cost of moving faster — not just because you cover ground quicker, but because sprinting demands far more muscular effort per stride.

If you enter a distance instead of a duration, the calculator first works out how long that distance takes at your chosen speed, then applies the same formula. This makes it easy to look up the cost of a standard 5 km parkrun or a 10 km race at race pace.

Worked example

A 70 kg runner completes a 5 km run at 6 mph (9.7 km/h) — a typical easy training pace:

Speed: 6 mph → MET = 9.8
Time to cover 5 km at 9.7 km/h = 5 ÷ 9.7 = 0.515 hours (≈ 31 minutes)
Calories = 9.8 × 70 × 0.515 = 353 kcal

The same runner on a 30-minute easy jog (4 mph):

MET = 6.0, duration = 0.5 hours
Calories = 6.0 × 70 × 0.5 = 210 kcal

And a fast 30-minute tempo run (8 mph):

MET = 11.8, duration = 0.5 hours
Calories = 11.8 × 70 × 0.5 = 413 kcal

Speed	Pace	MET	kcal / 30 min (70 kg)
4 mph (slow jog)	15:00 min/mile	6.0	210
6 mph (moderate)	10:00 min/mile	9.8	343
8 mph (fast)	7:30 min/mile	11.8	413
10 mph (sprint)	6:00 min/mile	14.5	508

Formula note

The formula assumes flat, firm terrain at moderate temperature. Running uphill, in sand, or in heat all increase the real calorie cost above the MET estimate. The Compendium values represent a population average; elite runners with exceptional running economy may burn slightly less than predicted, while beginners often burn slightly more.

Kilojoule conversion uses the standard: 1 kcal = 4.184 kJ.

All calculations run entirely in your browser — nothing is uploaded or stored.