Fitness & Health

BMR Calculator (Revised Harris-Benedict Equation)

Find your basal metabolic rate with the revised Harris-Benedict equation. The widget shows BMR, your daily energy needs across five activity levels, and a Mifflin-St Jeor comparison, in metric or imperial.

How to use
  1. Enter your age, sex, height, and weight.
  2. Switch between metric and imperial units.
  3. Compare against the Mifflin-St Jeor value.
Activity
Basal metabolic rate

TDEE (chosen)
Mifflin-St Jeor BMR
TDEE if sedentary
TDEE if very active
Estimates for general wellness, not medical advice. Check with a doctor or dietitian before acting on health figures.
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How it's calculated

BMR♂ = 88.362 + 13.397·kg + 4.799·cm − 5.677·age; BMR♀ = 447.593 + 9.247·kg + 3.098·cm − 4.330·age; TDEE = BMR × activity

kg = weight, cm = height, age = years, activity = multiplier from 1.2 (sedentary) to 1.9 (very active). Revised Harris–Benedict (1984) equation; TDEE = daily maintenance calories.

Common questions

What is BMR?

Basal metabolic rate is the number of calories your body burns at complete rest just to keep its basic functions running.

How is TDEE different from BMR?

TDEE is your total daily energy expenditure, which multiplies your BMR by an activity factor to account for movement and exercise.