FFMI is an alternative to BMI where in FFMI, the muscle along with fat mass is considered based on height and weight. But the muscle mass is not taken into consideration in BMI. This online FFMI calculator will help you to find your FFMI using your body fat.

Calculator of Fat Free Mass Index

Weight
Body Fat
%
Height
cm
Lean
Fat Free Mass Index (FFMI)
Adjusted FFMI

Formula of Fat Free Mass Index

Lean = Weight * ( 1.0 – (BodyFat / 100.0 ))

FFMI = ( Lean / 2.2 ) / ((Height * 12.0 + Inches) * 0.0254)2

Adjusted FFMI = FFMI + ( 6.0 * ( ((Height * 12.0 + Inches) * 0.0254) – 1.8 ))

Fat free mass index is useful for athlete people who has muscle rich body.

Example

A person weighing 50 kgs, with body 12 % and height 5’4 will have

Lean Weight =

=50 * (1.0 – (12 / 100))
= 50 * ( 1 – 0.12)
= 50 * 0.88
= 44.00 kg

FFMI

 = ( 44 / 2.2) / ((5*12.0) + 4)*0.0254)^2
= 20 / ((60 + 4) * 0.0254)^2
= 20 / (1.6256)^2
= 20 / 2.6425
= 7.56

Adjusted FFMI

 = FFMI + (6* 5 + 12.0 + 4) * 0.0254) – 1.8
= 7.56 + ( 6.0 * ( ((5 * 12.0 + 4) * 0.0254) – 1.8 ))
= 6.522

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