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FFMI Calculator (Fat-Free Mass Index)

Calculate your Fat-Free Mass Index (FFMI) and normalised FFMI from height, weight and body fat % to see how muscular you are.

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What is the FFMI Calculator?

FFMI tells you how much lean mass you carry for your height, which BMI cannot. Enter your height, weight and body fat percentage to get lean mass, FFMI and the height-normalised FFMI with a simple rating.

How to use the FFMI Calculator

  1. Enter height, weight and body fat %.
  2. Read FFMI and normalised FFMI.

What is a good FFMI?

For men roughly 18–20 is average, 20–22 above average, 22–23 excellent and 25+ is rare naturally. Women are about 3 points lower.

This FFMI Calculator is 100% free, needs no signup and runs privately in your browser – on phone, tablet or computer.

Last updated: · By NodifyTech