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Muscle Mass Potential (Butt Formula)

Estimate your maximum lean muscular size limits and bone structure capacity based on the John Butt formula.

The Casey Butt Natural Muscular Potential Formulas

Based on extensive statistical tracking of drug-free champions, researcher Casey Butt developed highly accurate formulas correlating bone structures (wrist and ankle measurements) with maximum muscular limits. This provides natural lifters with realistic long-term physiological expectations.

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These formulas represent the upper 95th percentile of elite natural genetic potential. For the vast majority of lifters, reaching these limits takes 5-10 years of consistent training.

Wrist and ankle sizes indicate overall skeletal mass and thickness, which directly limit muscle attachment volumes.