The world's only FFMI calculator for gym nerds

Determine your Fat Free Mass Index (FFMI) or work backwards from your goal FFMI to find your target muscle gain / fat loss.

20.59FFMI

Above average

1619222528+

Body Fat Mass (lbs)

Lean Fat Free Mass (lbs)

*FFMI

*Normalized FFMI

*Set your goal FFMI to determine the muscle gain, target weight or body fat % needed to reach it.

When adjusting FFMI

Keep same body fat mass (adjusts lean mass)Keep same body fat % (adjusts weight)Keep same weight (adjusts body fat %)

Height

ftin

3 ft8 ft

Weight

lbs

65 lbs350 lbs

Body Fat

0 %100 %