GlenCalc

FFMI calculator

FFMI is like BMI for lean mass only, so it separates muscle from fat. Use a body fat estimate from a scan, calipers or the body fat calculator.

Your answer

FFMI22 kg/m²
Height-adjusted FFMInormalized to 1.8 m tall22.1 kg/m²
Fat-free mass153 lb

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How we worked it out

Updated as you change the numbers.

  1. Fat-free mass = weight × (1 − body fat %).
  2. FFMI = fat-free mass in kg ÷ height in m².
  3. Adjusted FFMI = FFMI + 6.1 × (1.8 − height in m).

Method and assumptions

In the original study of male athletes, most men without anabolic steroid use had an adjusted FFMI below about 25. Typical untrained men are around 18 to 20 and women around 14 to 17.

Questions

What is the FFMI of a 180 lb man, 5 ft 10 in, with 15% body fat?

22.0, or 22.1 adjusted for height.

Sources

Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.

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