Muscle Potential Calculator

Casey Butt's 2009 regression derived maximum muscular bodyweight from height, wrist and ankle circumference (a proxy for bone size) at a chosen body-fat level. It was fitted to data on natural bodybuilders from the early 20th century onward.

It is a ballpark, not a promise: real potential varies with muscle-belly length, training age and recovery. Most people take 4-8 years to approach their ceiling, and gains slow sharply after the first two years.