Toolipedia
EN
← All text tools

Fat-free mass index (FFMI) calculator

Your muscularity score from weight, height and body fat, normalised and compared with natural limits.

  • Free
  • No sign-up
  • Works on any device

About Fat-free mass index (FFMI) calculator

Fat-free mass index compares lean mass to height, like BMI but without fat. Compute lean mass from weight and body fat, divide by height in metres squared, then normalise to 1.8 m. Natural lifters are often below about 25, so scores far above that deserve a second look.

How to use Fat-free mass index (FFMI) calculator

  1. Enter your weight, height and body fat percentage.
  2. Check the FFMI and the normalised value.
  3. Compare it with the natural range shown.

Why use this tool?

Also known as

Frequently asked questions

What is a good FFMI for a natural lifter?

Most natural men fall between 18 and 25. Scores above 25 are rare without performance-enhancing drugs, though not impossible.

What is normalised FFMI?

It adjusts the value to a standard height of 1.80 metres so people of different heights can be compared more fairly.

Is a high FFMI proof of steroid use?

No. The natural limit is a rough guide and body fat estimates can be inaccurate. A single number cannot prove anything about a person.

Is Fat-free mass index (FFMI) calculator free?

Yes. Fat-free mass index (FFMI) calculator on Toolipedia is free to use, with no sign-up and no watermark.

Is it safe to use?

Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.

Does it work on my phone?

Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.

Do I need an account?

No. Just open the page and use the tool. There's no sign-up and no email needed.

Can I put Fat-free mass index (FFMI) calculator on my own website?

Yes. Use the Embed on your site button under the tool to copy a short piece of code and paste it into your page. It is free, needs no account, and the tool keeps working inside your page.

Related tools