CDC NHANES Calibrated • Multi-Girth Precision

Anthropometric Body Fat & Somatotype Engine

Standard bathroom scales and basic BMI formulas fail to distinguish between heavy muscle and excess adipose fat. This engine uses multi-girth anthropometric regression models calibrated against national CDC NHANES health data to accurately calculate your true body fat percentage, lean muscle mass, metabolic daily calorie burn, and customized daily protein targets.

Body Measurements

Biological Sex

Age (Years)

Height (in)

Weight (lbs)

1. Core Anthropometric Girths (Required)

Neck Girth (at Adam's apple)

Waist (at Navel Level)

Hips (Widest Point)

Chest (Mid-Sternum, Relaxed)

2. Muscular Girths & Daily Activity

Bicep (Flexed, Peak)

Forearm (Flexed, Widest)

Thigh (Gluteal Fold)

Calf (Standing Maximum)

Daily Activity Baseline

Estimated Body Fat Percentage

--%

Enter measurements above to calculate

Athletic Fitness Average Elevated

Lean Body Mass

Metabolically active muscle & bone

Total Fat Mass

Stored adipose tissue

Normalized FFMI

Muscularity index

Waist-to-Height

Optimal Risk (<0.50)

Evidence-Based Daily Protein Targets

Weight Maintenance (1.25 g/kg): -- g

Muscle Hypertrophy / Athlete (1.65 g/kg): -- g

Basal Burn (BMR)

Calories at complete rest

Daily Burn (TDEE)

Maintenance calories

Fat Loss Target (-20%)

Controlled safe deficit

Muscle Gain (+10%)

Lean muscle surplus

Daily Hydration

Fluid baseline

V-Taper Ratio

Chest / Waist balance