BMR Calculator

The BMR Calculator estimates your Basal Metabolic Rate — the number of calories your body burns at complete rest just to keep you alive, breathing, circulating blood and maintaining temperature.

Enter your weight in kilograms, height in centimetres, age and sex, and it returns your BMR in calories per day.

You can choose between two well-known formulas.

Mifflin-St Jeor is the modern default and generally the most accurate for the average person; Harris-Benedict is the classic revised equation that many older charts and apps still use.

Seeing both lets you sanity-check a figure you have read elsewhere.

Because almost nobody spends the whole day at rest, the tool also estimates your Total Daily Energy Expenditure (TDEE) by multiplying BMR by an activity factor, from sedentary through to very active.

TDEE is a practical maintenance estimate: eat around it to hold your weight, below it to lose, above it to gain.

The result shows BMR, TDEE and the multiplier used so the maths is transparent.

These are population-average estimates, not medical advice — individual metabolism varies.

Everything is computed locally in your browser with no uploads, so your personal numbers stay private and the tool works offline.