CalculatorHealth

FFMI Calculator

Estimate fat-free mass index from body weight, height and body-fat percentage.

Instant · no account

Input

Enter your values

Body weightkg

Heightcm

Body fat%

Method

How it works

Change any input above and the result updates instantly. The formula or method used by this tool is shown below.

FFMI = Fat-free mass (kg) ÷ height² (m)

Note

Health results are general informational estimates and are not a diagnosis or medical advice.

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Quick answers

About this tool

What does the FFMI Calculator do?+

Estimate fat-free mass index from body weight, height and body-fat percentage.

How does this calculator calculate the result?+

It uses this method: FFMI = Fat-free mass (kg) ÷ height² (m)

Are my inputs saved or sent to an account?+

Core CalcForge tools require no account, and most calculations run locally in your browser. Favorites and recent-tool history, when used, stay in this browser.