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Fat-Free Mass Index Calculator

Calculate your fat-free mass index. Free online calculator with instant results — no login needed.

Height (cm) Lean Body Mass (kg)

Fat-Free Mass Index

What is the Fat-Free Mass Index Calculator?

Calculate your fat-free mass index. Free online calculator with instant results — no login needed.

Enter your values above and the result updates instantly. A muscle-mass indicator.

FFMI = lean mass ÷ height²

Fat-Free Mass Index

Good range?

About 18–22 for men, lower for women.