# FFMI (Fat free mass index ) Calculator | Find alternative to BMI

Here you can calculate fat free mass index (FFMI) using only 3 parameters of your body: weight, height and body fat. If you don’t know the last indicator, you can use one of these calculators:

## What is FFMI?

FFMI is the abbreviation of Fat Free Mass Index that means an amount of muscle mass in relation to height and weight of a human. It is an alternative to BMI which is considered to be more precise for well-trained people, including professional sportsmen and bodybuilders.

## FFMI calculation

FFMI calculator uses quite difficult formula which includes the calculation of lean body mass:

Lean = Weight × (1.0 – (Body Fat / 100.0))

FFMI = (Lean / 2.2) / ((Height × 12.0 + Inches) × 0.0254)2

Adjusted FFMI = FFMI + (6.0 × (((Height * 12.0 + Inches) × 0.0254) – 1.8))

To simplify it we recommend using our fat free mass index calculator.

## What is a good FFMI?

The norm of average FFMI depends on the gender:

 Description of the result For men For women Below average < 18 < 15 Average 18 – 20 15 – 17 Above average 20 – 22 17 – 18 Excellent 22 – 23 18 – 19 Superior 23 – 26 19 – 21.5 Suspicion of steroid use but might be attainable naturally 26 – 28 21.5 – 25 Steroid usage likely > 28 > 25

However, you may also meet another FFMI scale on the Internet.

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