Raw FFMI: <18 skinny, 18–20 average, 20–22 above average, 22–25 muscular, 25+ very muscular. Adjusted FFMI: 25 is roughly the natural limit; 28+ suggests enhancement.

How accurate is FFMI?

It depends entirely on body fat measurement accuracy. DEXA scans give the most reliable FFMI; visual estimates and bioimpedance are far less accurate.

FFMI Calculator

Quick answer: Enter height, weight, and body fat % to get your raw and adjusted FFMI.

FFMI measures lean muscle mass relative to height. Adjusted FFMI normalizes to a 1.8m / 5'11" person so you can compare across heights. Studies suggest a natural FFMI limit of about 25; sustained values above 28 are typically considered enhanced.

Last reviewed: April 2026Report an error

Height (ft)

Height (in)

Weight (lbs)

Body Fat %

Adjusted FFMI

22.1

Lean body mass: 153.0 lbs. Raw FFMI: 22.0. Classification: Above average.

Lean mass

153.0 lbs

Raw FFMI

22.0

Adjusted FFMI

22.1

Tier

Above average

How to Use This FFMI Calculator

1Enter your height in feet and inches.
2Enter your weight in pounds.
3Enter your body fat percentage (use the Body Fat Calculator if needed).
4Read raw FFMI, adjusted FFMI, and classification.

Frequently Asked Questions

: Raw FFMI: <18 skinny, 18–20 average, 20–22 above average, 22–25 muscular, 25+ very muscular. Adjusted FFMI: 25 is roughly the natural limit; 28+ suggests enhancement.
: It depends entirely on body fat measurement accuracy. DEXA scans give the most reliable FFMI; visual estimates and bioimpedance are far less accurate.

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FFMI Calculator

How to Use This FFMI Calculator

Frequently Asked Questions

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