BMR Calculator
A 32-year-old woman weighing 68 kg (150 lb) at 165 cm has a BMR of about 1,390 calories a day, the energy her body burns at complete rest. This BMR calculator estimates your basal metabolic rate with the Mifflin-St Jeor equation, the standard prediction formula in modern nutrition practice.
Quick answer
BMR estimates calories your body uses at complete rest.
What this tells you
- •BMR estimates calories your body uses at complete rest.
- •This tool uses the Mifflin-St Jeor formula.
- •BMR is an estimate, not a diagnosis or medical test.
How to Use
- 1Enter sex, age, weight, and height.
- 2Calculate to view estimated BMR in kcal/day.
- 3Use BMR as a baseline before applying activity multipliers.
How It Works
Formula
Male: BMR = 10W + 6.25H - 5A + 5
Female: BMR = 10W + 6.25H - 5A - 161W is weight in kilograms, H is height in centimeters, and A is age in years using Mifflin-St Jeor assumptions.
Calculation note: values are processed in the order shown above, using the current input units.
Worked Examples
Estimated BMR example
BMR provides a baseline estimate before exercise and daily activity are added.
Common mistakes
- Treating BMR as exact daily calorie target
- Using outdated body measurements
- Ignoring medical factors that can affect metabolism
Limitations
This estimate is based on population-level formulas and cannot capture individual metabolic conditions, medications, hormonal factors, or clinical diagnoses.