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Health Calculators

BMR Calculator

Enter your sex, weight, height and age to estimate the calories your body needs at complete rest.

1649

calories per day at rest (BMR)

How to use it

  1. Choose your sex The formula differs slightly for men and women.
  2. Enter weight, height and age Use metric units.
  3. Read your BMR See the calories your body burns at rest.

Examples

M, 80 kg, 180 cm, 30 1,780 kcal
F, same 1,614 kcal

About this tool

Your basal metabolic rate is roughly the number of calories your body would burn in a day if you did nothing but rest. It is the starting point for working out how much you need to eat to maintain, lose or gain weight.

This calculator uses the Mifflin-St Jeor equation, a well-regarded estimate based on your sex, weight, height and age. It is a general estimate, not medical advice — individual needs vary, so consult a professional for personalized guidance. Your data stays in your browser.

Frequently asked questions

What is BMR?

Basal metabolic rate is the energy your body uses at complete rest to keep functioning — breathing, circulation and so on. It's the largest part of daily calorie use.

Which formula does this use?

The Mifflin-St Jeor equation, which is widely regarded as one of the most accurate for estimating BMR.

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Updated June 12, 2026