Built for real work
FFMI and normalized FFMI.
FFMI Calculator — Fat-Free Mass Index
Calculate fat-free mass index (FFMI) from weight, height, and body fat. Free FFMI calculator for fitness.
Formula used
FFMI = Lean mass (kg) / height (m)² Normalized FFMI adjusts for height
Examples
Try a sample calculation
80 kg, 180 cm, 15% fat
Athletic build
Fast and focused
Metric and imperial.
Clear results
Lean mass focus.
Main features of Ffmi Calculator:
Enter the required fields—dates, amounts, percentages, or measurements as labeled.
Double-check units (currency, tax rate, height/weight) match your scenario.
Run the calculation and read the breakdown, not just the headline number.
Adjust inputs to compare scenarios, or open a related Rankify calculator for the next step.