FFMI Calculator

The FFMI is a valuable measure for assessing muscle mass relative to height. You have the option to choose between two calculation methods: either by inputting your body fat percentage or your lean body mass. If you're unsure about these values, you can calculate them here: Body Fat Percentage Calculator and Lean Body Mass Calculator.

Instructions

• Choose Gender: Before you enter your data, select your biological gender. The classification of your FFMI depends on whether you choose male or female.

• Calculation Method: Choose the calculation method from the dropdown menu.

  • Option 1: Total Weight + Body Fat Percentage: Use this option if you know your total weight and body fat percentage.

  • Option 2: Lean Body Mass: Use this option if you know your lean body mass directly.

    • Option 1:
      - Enter your weight in kilograms.
      - Enter your height in centimeters.
      - Enter your body fat percentage.

    • Option 2:
      - Enter your lean body mass in kilograms.
      - Enter your height in centimeters.

• Calculate: Click the "Calculate" button to compute your FFMI based on the selected method.

• Results: Your FFMI will be displayed below the input fields.
  
  

How to Interpret Your FFMI

The Fat-Free Mass Index (FFMI) calculates the fat-free mass relative to height, supplemented by a small correction factor.

Studies show that there is a natural upper limit for FFMI, which is 25 for men. An FFMI above this value could indicate possible doping use, which is why FFMI is also used in the realm of natural bodybuilding to monitor illegal substances.

FFMI also reflects the remaining potential for muscle building. It is recommended that men aim for an FFMI above 20 and women above 17.