Fat-Free Mass Index (FFMI) is a calculation that accounts for your muscle mass relative to your height. Unlike BMI, it uses your body fat percentage to determine how much of your weight is lean muscle.

What is a 'natural' FFMI limit?

Research by Kouri et al. suggests that a normalized FFMI of 25 is the upper limit for the vast majority of natural (drug-free) athletes. Scores significantly above 25 are rarely achieved without the use of performance-enhancing drugs or exceptional genetics.

How is Maximum Muscular Potential estimated?

This tool uses formulas developed by researchers like Casey Butt, which use bone structure (wrist and ankle circumference) as an indicator of your frame's capacity to support muscle mass.

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Gezondheid

Spiervatbaarheid & FFMI Analyse

De ultieme referentie voor bodybuilders. Bereken je Fat-Free Mass Index (FFMI) en schat je natuurlijke genetische limiet.

Body Stats

Huidig Gewicht (kg)

Lengte (cm)

Vetpercentage (%)

15%

Bone Structure (For Potential)

Polsomtrek (cm)

Enkelomtrek (cm)

Genormaliseerde FFMI

21.0

Bodybuilding Status

Gevorderd / Atletisch

Vetvrije Massa

68.0 kg

Max Potential

46.7 kg

Bodybuilding Tip

FFMI is nuttiger dan BMI voor atleten. Een genormaliseerde score boven de 25 wordt vaak beschouwd als de 'bovengrens' voor de meeste natuurlijke atleten.

FFMI Scale

18-20: Average. 22-23: Distinctly muscular. 25-26: Extremely muscular (Upper limit for most natural athletes). 26+: Exceptional/Genetic outlier.

Medical Disclaimer: This tool is for educational and informational purposes only. It is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.