Muscle Potential Calculator

Estimate your maximum muscular potential using Casey Butt's formulas based on bone structure

5 ft
8 in
7.0 inches

How to measure: Measure around the smallest part of your wrist, just below the wrist bone.

8.5 inches

How to measure: Measure around the smallest part of your ankle, just above the ankle bone.

10%

Note: This is your target body fat percentage for maximum muscle potential calculations.

Maximum Lean Body Mass

167 lbs (76 kg)

Muscle + organs + bones (fat-free mass)

Maximum Body Weight

185 lbs (84 kg)

At 10% body fat

Maximum Measurements

Arms 16.2 inches
Forearms 13.1 inches
Neck 15.7 inches
Chest 44.2 inches
Thighs 24.1 inches
Calves 15.2 inches

Casey Butt's Formula

LBM = H^1.5 × (√W/22.667 + √A/17.01) × (F/224 + 1)

Casey Butt's scientifically-derived formula calculates maximum natural lean body mass based on bone structure (wrist/ankle) and height. The formula was developed from measurements of elite natural bodybuilders at their competitive peak. LBM = Lean Body Mass, which excludes body fat. Total weight is calculated by dividing LBM by (1 - body fat %).