Katch-McArdle BMR Calculator
Calculate BMR using the Katch-McArdle formula, which accounts for lean body mass.
How to use this tool
- Enter lean body mass in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your bmr and the full breakdown beneath it.
The Katch-McArdle formula uses lean body mass (LBM) instead of total weight, making it more accurate for lean or muscular individuals.
Frequently asked questions
- What makes Katch-McArdle different from Mifflin-St Jeor?
- Katch-McArdle uses lean body mass rather than total body weight, so it is more accurate for people who know their body fat percentage. Mifflin-St Jeor only needs weight, height, age, and sex.
- How do I find my lean body mass?
- Subtract fat mass from total weight. Use our Lean Body Mass Calculator to estimate LBM from height, weight and sex using the Boer formula.