Calories Burned Calculator
Estimate calories burned during any activity.
All calculations happen locally in your browser — nothing is uploaded, stored or tracked.
Pick an activity
From the dropdown of common activities.
Enter your weight
The biggest personal factor.
Set the duration
Minutes or hours — the calories update live.
What Is a Calories Burned Calculator?
Calories burned during exercise depend mainly on the activity, your weight, and how long you do it. This calculator uses the MET (metabolic equivalent) system — each activity has a MET value representing how many times harder it is than resting.
Walking, running, cycling, swimming, gym work, sports and everyday chores are covered. The MET values are published reference values from the standard compendium of physical activities.
The Formula
For example, walking at a moderate pace has a MET of about 4.3. A 70 kg person walking for an hour burns roughly 4.3 × 70 × 1 ≈ 300 kcal.
Limitations
Your data never leaves your device.
Every calculation on this site runs in your browser using vanilla JavaScript. Nothing is uploaded, stored or tracked.
- 100% local, client-side calculations
- No data stored on any server
- No tracking, no analytics, no ads scripts
- Works offline once loaded
Frequently Asked Questions
How many calories do I burn walking?
A 70 kg person burns about 280–350 kcal per hour of brisk walking, depending on pace. The calculator estimates it precisely from MET values.
How many calories do I burn running?
Roughly 700–900 kcal per hour for a 70 kg runner at a 10 km/h pace — the calculator uses the MET for the pace you choose.
What is a MET?
A metabolic equivalent: 1 MET is resting energy use. An activity rated 8 METs burns 8× the resting rate.
Does weight really matter?
Yes — it is directly in the formula. Heavier people burn more calories for the same activity because moving more mass takes more energy.
Are these results accurate?
Good estimates for most people, but individual fitness, intensity and terrain cause variation.