Checks Out
All calculators
Health & WellbeingLive

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.

About you

Sex

Fill in the fields above to see your result instantly.

Calculation method, coverage and version

Inputs used
Sex, Age (years), Weight (kg), Height (cm).
Calculation approach
The calculator applies the rules and assumptions described in “How it works” to the values you enter. Rounding can cause small differences from an official or provider calculation.
Coverage
Health & Wellbeing. UK nations, tax treatment, local rules and provider criteria can differ; check the official sources shown below before acting.
Content version
No page-specific review date is currently published. Treat the result as indicative and verify current rules independently.
Not included unless explicitly requested: personal circumstances not entered, provider discretion, future rule changes, professional fees and case-specific exceptions. Read the full calculator methodology.

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  • ×Using out-of-date Harris-Benedict formula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 →