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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Analizador de Potencial Muscular y FFMI

La referencia definitiva para culturistas. Calcula tu índice de masa libre de grasa (FFMI) y estima tu límite genético natural.

Body Stats

Peso Actual (kg)

Altura (cm)

Grasa Corporal (%)

15%

Bone Structure (For Potential)

Perímetro de la muñeca (cm)

Perímetro del tobillo (cm)

FFMI Normalizado

21.0

Estado de Musculación

Intermedio / Atlético

Masa Magra

68.0 kg

Max Potential

46.7 kg

Consejo de Culturismo

El FFMI es más útil que el IMC para los atletas. Una puntuación normalizada por encima de 25 se considera a menudo el 'límite superior' para la mayoría de los atletas naturales.

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.