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FFMI Calculator

Use this FFMI calculator to estimate lean mass, fat-free mass index, and normalized FFMI from weight, height, and body fat percentage.

kg

Use your current body weight in kilograms.

cm

Use your current height in centimeters.

%

Use your best estimate from a consistent method. Even a small body-fat error can move FFMI more than you might expect.

FFMI depends on the body fat estimate you enter. This tool also shows a normalized FFMI adjusted to a 1.8 m reference height for rough adult comparison, but neither number is a diagnosis or a complete picture of health.

This FFMI calculator provides a general estimate only and is not medical advice. If you have concerns about body composition, unexplained weight change, eating disorders, pregnancy, or growth in a child or teen, speak with a qualified healthcare professional before using the result to make health decisions.

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