Why do dietitians base protein needs on lean mass instead of total weight?

Lean Body Mass Calculator - Boer, James & Hume Formulas

Calculate lean body mass (fat-free mass) in pounds and kilograms using clinically validated Boer, James, and Hume formulas for optimal protein dosing.

⚙️ Configuration & Inputs

Biological Gender

Body Weight (lbs)

Height (inches) e.g. 5'10" = 70 inches

📊 Results & Analysis

Lean Body Mass (Boer Formula) 146.4 lbs (66.4 kg) 81.3% Fat-Free Mass

Body Fat Mass (Estimated) 33.6 lbs (15.2 kg) 18.7% Body Fat

James Formula Result 144.2 lbs (65.4 kg) Alternative clinical standard

Optimal Daily Protein Intake 146 - 175 g / day 1.0 to 1.2 g per lb of lean mass

Why Lean Body Mass is Better Than Total Weight

Lean body mass (LBM) represents total weight minus all adipose body fat, including skeletal muscle, bones, organs, and intracellular water.

Frequently Asked Questions

Fat tissue requires very little metabolic protein synthesis. Basing protein on lean mass prevents overestimating protein requirements for overweight individuals.