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BMR Calculator

Basal Metabolic Rate — the calories you'd burn if you stayed in bed all day.

Short answer

BMR is what your body needs to keep heart, lungs, brain and organs working at rest. The Mifflin-St Jeor formula is the modern standard, more accurate than the older Harris-Benedict.

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How it works

Mifflin-St Jeor (1990): BMR = 10×weight(kg) + 6.25×height(cm) − 5×age(y) + 5 (men) or − 161 (women).

Worked example

30y male, 75 kg, 175 cm: 10×75 + 6.25×175 − 5×30 + 5 = 1,699 kcal/day BMR.

Who should use this

  • •Anyone planning calorie targets
  • •Athletes calculating recovery needs

Common mistakes

  • ×Confusing BMR (resting) with TDEE (total daily burn)
  • ×Using out-of-date Harris-Benedict formula

Frequently asked questions

What's the difference between BMR and TDEE?▾

BMR is at rest; TDEE includes activity, digestion and exercise.

Related calculators

TDEE Calculator →Calorie Calculator →Macro Calculator →