How does the Mifflin-St Jeor equation calculate BMR?
Mifflin–St Jeor: women = 10W + 6.25H − 5A − 161; men = 10W + 6.25H − 5A + 5, with kg, cm, and years.
Health & fitness
Basal metabolic rate BMR calculator
Estimate daily resting energy expenditure with the Mifflin–St Jeor equation.
- Metric and imperial units
- Instant updates as inputs change
- Data is calculated in this browser only
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BMR1451 kcal/day
- Hourly average
- 60 kcal/hour
BMR is a prediction at rest and excludes daily activity and exercise. Indirect calorimetry provides a more individualized measurement.
Calculation notes
Understand the Basal metabolic rate BMR calculator
Uses the Mifflin–St Jeor equation to estimate daily resting energy expenditure from weight, height, age, and the sex term used by the equation.
What is the BMR for a 30-year-old woman at 70 kg and 170 cm?
For a 30-year-old woman at 70 kg and 170 cm: 700 + 1,062.5 − 150 − 161 = about 1,452 kcal/day.
What is the difference between BMR and TDEE?
- BMR estimates energy used at rest before daily activity or exercise.
- Use a TDEE calculator when you need an estimate that includes activity.
Why can actual resting metabolism differ from calculated BMR?
- Individual metabolism can differ because of body composition, health, and measurement conditions.
- The sex term is part of the published equation and does not capture every individual.
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