About the BMR Calculator
Find out how many calories your body burns at rest, using three established formulas, and how many you need each day for your activity level.
Key features
- Mifflin-St Jeor, Harris-Benedict and Katch-McArdle
- Daily calories for five activity levels
- Metric or imperial units
- Optional body-fat percentage
- Instant results
- Private: runs in your browser
How many calories do you burn at rest?
Your BMR is the energy your body needs just to function. Knowing it, and your total daily needs for your activity level, is the starting point for losing, maintaining or gaining weight.
The formulas
| Formula | Men | Women |
|---|---|---|
| Mifflin-St Jeor | 10W + 6.25H − 5A + 5 | 10W + 6.25H − 5A − 161 |
| Harris-Benedict (revised) | 88.36 + 13.40W + 4.80H − 5.68A | 447.59 + 9.25W + 3.10H − 4.33A |
| Katch-McArdle | 370 + 21.6 × lean body mass (kg) | same |
W = weight (kg), H = height (cm), A = age (years).
Example
A 30-year-old man, 175 cm and 70 kg, has a BMR of about 1,649 kcal/day (Mifflin-St Jeor). With moderate exercise (×1.55), his maintenance calories are about 2,556 kcal/day.
Related calculators
Calorie calculator, macro calculator, and lean body mass calculator.
How to use the BMR Calculator
- Enter your numbers in the fields above. Units and options can be changed at any time.
- The result updates instantly as you type; there's no calculate button to press.
- Check the breakdown under the main result for the details behind the number.
- Adjust the inputs to compare scenarios, for example a different rate or term.