10 KM Run Calorie Calculator

How the Running Calorie Calculator Works

Whether you enter a distance and a speed, or a distance and a finish time, the calculator reduces your run to two numbers: your average speed and how long you ran. From those it computes:

Calories (kcal) = MET × Weight (kg) × Time (hours)

1. Convert units if needed. Weight in pounds is multiplied by 0.453592 to get kilograms; speed in mph is multiplied by 1.60934 to get km/h.
2. Work out speed and time. If you entered a time, speed = distance ÷ time. If you entered a speed, time = distance ÷ speed.
3. Look up the MET value for that speed from the Compendium running codes below. Between two codes the MET is interpolated in a straight line, so 7.25 mph gets a value halfway between the 7 mph and 7.5 mph codes. Codes that cover a speed range (such as 6.0–6.3 mph) are placed at the middle of the range. Below 4 mph the MET is held at 6.5, and above 14 mph at 23.0.
4. Multiply MET × kg × hours. The calculator also shows the hourly rate (MET × kg), which is what you would burn if you held that pace for 60 minutes.

One MET is roughly the energy you use sitting quietly, about 1 kcal per kg of body weight per hour. A running MET of 9 therefore means about 9 kcal per kg per hour. The result is a gross figure: it includes the calories your body would have burned anyway at rest during that time.

Compendium Running MET Values by Speed

"Running, by speed (general)" codes from the Compendium of Physical Activities, as used by the calculator

For range codes, km/h and pace refer to the middle of the range.

What those values mean at common paces for a 155 lb (70 kg) runner

Example Calculation

A 155 lb runner covers 3 miles at a 10:00/mi pace, which takes 30 minutes:

1. Weight: 155 lb × 0.453592 = 70.3 kg

2. Speed: 3 mi ÷ 0.5 h = 6.0 mph = 9.66 km/h

3. MET: 6.0 mph lies between the 5.5–5.8 mph code (9.0 MET, placed at 5.65 mph) and the 6.0–6.3 mph code (9.3 MET, placed at 6.15 mph), so MET = 9.0 + 0.35 ÷ 0.5 × 0.3 ≈ 9.21

4. Calories: 9.21 × 70.3 kg × 0.5 h ≈ 324 kcal (about 108 calories per mile, 648 per hour)

Distance-based and time-based runs work the same way: a fixed-duration run (10, 30 or 60 minutes) just fixes the hours in the formula, while a fixed distance (a mile, 5K, 10K, half marathon or marathon) fixes the miles and your finish time sets both the speed and the hours.

Calories Burned per Mile by Body Weight

Calories per mile (per km in brackets) at four paces, from the same formula as the calculator. Multiply by your distance for a total.

Why Pace Matters Less per Mile Than per Minute

Running faster raises the MET, so you burn much more per minute: a 155 lb runner burns about 10 calories a minute at 12:00/mi, 11 at 10:00/mi, 14 at 8:00/mi and 17 at 6:00/mi. But a faster pace also means each mile takes less time. In the Compendium the MET rises roughly in step with speed, so the two effects nearly cancel and the cost per mile stays in a narrow band: about 100–120 calories for 155 lb anywhere between 5 and 14 mph. That matches the well-known rule of thumb of roughly 1 kcal per kg of body weight per kilometer, and it is why a faster 5K or 10K burns about the same total as a slower one over the same distance.

Because the Compendium values are measured averages rather than a smooth curve, calories per mile do not move in one direction as you speed up: they wobble by a few percent from one speed to the next. Treat differences of less than about 10% between two paces as noise.

Limitations

• Individual variation: MET values are population averages. Running economy, fitness, age, sex and body composition can move your real burn by 10–20% either way. The formula scales only with body weight.
• Terrain and conditions: The MET values assume flat ground. Hills, trails, sand, snow, strong wind and heat all raise the cost; a flat treadmill run is close to or slightly below the estimate.
• Gross vs. net: The result is gross calories, which includes your resting metabolism (about 1 kcal per kg per hour). The extra calories from running alone are roughly 1 MET lower, so about 70 kcal less per hour for a 70 kg runner. Use the net figure if you are adding exercise to a daily total that already counts your resting burn.
• Average pace only: The calculator uses your average speed for the whole run. Intervals, stops and walk breaks are treated as if you ran evenly at the average pace.

Note:

The calculated calories are estimates for planning training and nutrition. For weight loss, treat them as a guide and adjust based on how your weight actually changes over several weeks.