BMR Calculator

Estimate the calories your body burns at complete rest using the Mifflin-St Jeor, revised Harris-Benedict or Katch-McArdle equations.

What is the BMR Calculator?

Basal metabolic rate is the energy needed for basic functions like breathing, circulation and cell repair. It is usually 60–70% of daily energy use.

How does it work?

Each equation uses weight, height, age and sex (Katch-McArdle uses lean body mass instead). Mifflin-St Jeor is generally the most accurate for most people.

Formula

Mifflin-St Jeor: 10W + 6.25H − 5A + 5 (men) or − 161 (women)
W = kg, H = cm, A = years

Example

A 30-year-old man, 70 kg and 175 cm: 700 + 1,093.75 − 150 + 5 = 1,649 kcal/day.

Frequently asked questions

Why does BMR fall with age?

Muscle mass tends to decline with age, and muscle burns more energy at rest than fat.

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