About the BMR Calculator
Your basal metabolic rate (BMR) is the energy your body uses at complete rest to keep you alive. Compare three established equations and see calories needed for each activity level.
How to use it
- Enter age, sex, height and weight.
- Optionally add body fat % for the Katch-McArdle formula.
- Compare equations and daily needs by activity level.
Formula & method
Mifflin-St Jeor: 10·kg + 6.25·cm − 5·age + 5 (men) / − 161 (women)
Katch-McArdle: 370 + 21.6 × lean mass (kg)Frequently asked questions
Which BMR formula is most accurate?
Mifflin-St Jeor is generally considered the most accurate for the general population. Katch-McArdle can be better if you know your body fat percentage.
Results are estimates for general information only and are not financial, tax, legal or medical advice. Please confirm important decisions with a qualified professional.