# Running Calorie Calculator

URL: https://speedycalculator.com/calculators/sports/running-calorie/
Last updated: 2026-10-30

> The running calorie calculator estimates the net calories burned running a given distance from your weight, the slope, and whether you run outdoors or on a treadmill, and estimates your VO₂ max from resting heart rate.

## Inputs

- Age (years)
- Body weight (kg, lb)
- Resting heart rate – beats in 20 s
- Distance (km, mi, m, yd)
- Average grade (%)
- Where

## Results

- Grade factor
- Estimated VO₂ max
- Net calories burned
- Gross calories (including resting)

## Formula

```
Net kcal ≈ distance (km) × weight (kg) × (1 + 4.5·grade) for uphill (ACSM running equation)
Downhill: cost falls to about 80% at −10%, then rises again · Outdoors ≈ 3% more than treadmill (air resistance)
```

## Explanation

Running costs about one kilocalorie per kilogram per kilometre, almost regardless of speed. Hills change that a lot: a 5% climb raises the cost by nearly a quarter. Fitness has a smaller effect – fitter runners are a little more economical.

### How to use the Running Calorie Calculator

- **Age (years)**
- **Body weight**
- **Resting heart rate – beats in 20 s**
- **Distance**
- **Average grade (%)**
- **Where**

Results update as you type, every field has its own unit menu, and everything is calculated in your browser.

### How it works

Enter your age, weight and resting heart rate (beats in 20 seconds), the distance, the average grade and whether you ran on a treadmill.

### Inputs explained

FieldWhat to enterAge (years)A numberBody weightUnits: kg, lbResting heart rate – beats in 20 sA numberDistanceUnits: km, mi, m, ydAverage grade (%)A numberWhereChoose one: Outdoors, Treadmill

### What each result means

- **Estimated VO₂ max** = 15.3×(208 - 0.7×[Age (years)])÷([Resting heart rate – beats in 20 s]×3)
- **Net calories burned** = [Distance]÷1000×[Body weight]×[Grade factor]×[Where]×[fit]
- **Gross calories (including resting)** = [Distance]÷1000×[Body weight]×[Grade factor]×[Where]×[fit]×1.12

### Example values

How the main result changes when **Age** changes and everything else stays at the example values above:

Age (years)Net calories burned (kcal)1575622.57603076437.57684577260781

## Worked example

Inputs — Age (years): 30; Body weight: 75 kg; Resting heart rate – beats in 20 s: 20; Distance: 10 km; Average grade (%): 0; Where: Outdoors.

Results — Grade factor = 1; Estimated VO₂ max = 47.7 ml/kg/min; **Net calories burned = 764 kcal**; Gross calories (including resting) = 856 kcal.

## Key terms

- **Running economy**: Oxygen cost of running at a given speed.

## FAQ

**Does running speed change calories per km?**
Only slightly – distance and weight matter most.

**What are net calories?**
Calories above what you would have burned resting anyway.

**Why does the treadmill burn less?**
There is no air resistance; a 1% incline compensates.

**Does downhill running burn fewer calories?**
Yes, down to about −10%; steeper descents cost more again.


## Sources

- [ACSM's Guidelines for Exercise Testing and Prescription](https://www.acsm.org/education-resources/books/guidelines-exercise-testing-prescription)
- [Hall et al. (2004), Energy expenditure of walking and running, Med Sci Sports Exerc](https://doi.org/10.1249/01.MSS.0000142303.49306.0D)