Katch-McArdle Basal Metabolic Rate (lean-mass)
Katch-McArdle basal metabolic rate from lean body mass (370 + 21.6 × LBM).
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Weight
- 80 kg
- Body-fat %
- 20 %
Result: BMR 1752 kcal/day.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Use
- Keys off lean mass not total weight, so it is preferred for athletes and lean/obese bodies; TDEE = BMR × activity factor.
What you enter
- Lean body mass
- Weight (with body-fat %)
- Body-fat %
- Activity factor (optional, for TDEE)
How this is calculated
- Formula
- BMR (kcal/day) = 370 + 21.6 × lean body mass(kg). LBM entered directly, or derived as weight × (1 − body-fat%/100).
Katch FI, McArdle WD. Nutrition, Weight Control, and Exercise. Philadelphia: Lea & Febiger. (Lean-body-mass BMR equation.) Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.