Katch McArdle BMR Calculator
Estimate basal metabolic rate from lean body mass using the Katch-McArdle formula.
What Is the Katch-McArdle Formula?
The Katch-McArdle equation estimates basal metabolic rate (BMR) from lean body mass. It is often preferred for people with higher muscle mass because it does not rely only on total body weight. Compare with the BMR Calculator and TDEE Calculator.
Katch-McArdle BMR Formula
$$\text{BMR} = 370 + 21.6 \times \text{lean body mass (kg)}$$
Lean body mass can be entered directly, estimated from body fat percentage, or approximated with the Boer formula from height, weight, and sex.
When to Use This Method
Use Katch-McArdle when you know body composition reasonably well. If you only have basic height and weight, Mifflin-St Jeor or Harris-Benedict in the standard BMR calculator may be simpler.
Frequently Asked Questions
What is lean body mass?
Lean body mass is total body weight minus fat mass. It includes muscle, bone, organs, and water.
How do I estimate lean body mass from body fat?
Multiply weight by one minus body fat percentage. For example, 80 kg at 20% fat gives 64 kg lean mass.
Is Katch-McArdle more accurate than Harris-Benedict?
It can be more accurate when lean mass is known, especially for athletic individuals with unusual body composition.
Does this include activity calories?
No. BMR is resting energy only. Multiply by an activity factor or use a TDEE calculator for daily needs.
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