Compare three equations
Mifflin-St Jeor and revised Harris-Benedict use age, sex, height and weight. Katch-McArdle uses estimated lean mass from weight and body-fat percentage. These are population equations, not metabolic measurements.
Energy at rest
BMR Calculator: Estimate Resting Energy
Estimate daily energy at rest, then add activity to understand your total daily needs.
No account needed. Free tracking, from the first entry.
The method, in plain language.
Use BMR as a starting point
BMR describes energy needed at rest. It excludes the full cost of daily activity and digestion, so it is not a daily eating target. Continue to TDEE before choosing maintenance, loss or gain calories.
Find the right starting point.
One shared calculation engine, with a focus that fits your goal.
A few useful answers
Do I need to choose an activity level?
No. Activity does not enter the BMR calculation. Add your usual weekly activity in the next calculator to estimate TDEE.
Which BMR formula should I choose?
Mifflin-St Jeor is a practical starting option. Revised Harris-Benedict offers a comparison; Katch-McArdle requires a reliable body-fat estimate. Any equation can differ from your individual resting needs.