Katch-McArdle Calculator
Estimate BMR from lean body mass using the Katch-McArdle equation and show sensitivity to body-fat input.
Enter or adjust the values above, then calculate.
Katch-McArdle: bMR from Lean Body Mass
Estimate BMR from lean body mass using the Katch-McArdle equation and show sensitivity to body-fat input.
Inputs this tool uses
- Weight
- Body fat
What you get
Katch–McArdle estimate from lean body mass.
How to use the Katch-McArdle Calculator
- Enter weight, body fat.
- Select any method, activity level or option shown on this page, then choose Calculate.
- Read the main result together with the supporting values, method, assumptions and limitations below before using the estimate.
How this calculation works
Katch–McArdle estimates BMR from lean body mass.
Example calculation
The sample values loaded into the calculator produce 1610 kcal/day. This example exists to show how the output is structured; replace the sample values with your own inputs for your calculation.
Assumptions and limitations
- Energy and nutrient outputs are estimates or general reference values, not individualized treatment targets.
- Adult calorie-goal tools should not be used for children, pregnancy or medical nutrition therapy unless the page explicitly supports that life stage.
Sources and review status
Source set last verified 2026-09-25. No clinician review is claimed unless a real named reviewer is displayed.
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