# Somatic Composition Calculator

The **Somatic Composition Calculator** turns a few simple body measurements (height, weight, waist, hips, and optional chest/neck) into a clear snapshot of your current body proportions and composition signals. It instantly computes key ratios like **BMI, waist-to-height, waist-to-hip**, and (if you include neck) an estimated **body-fat %**, then summarizes your overall profile with a **shape archetype** and a **Somatic Score** you can track over time.

**Biological Sex** (for BF% formula)
        
          Male
          Female
        
        Only affects the Navy body-fat estimate (if you enter neck). Other ratios are neutral.

**Height** (cm)
        
        Measure without shoes. Used for BMI + Waist-to-Height Ratio (WHtR).

**Body Weight** (kg)
        
        Best consistency: morning (after bathroom, before food). Used for BMI + lean mass estimate.

**Waist Circumference** (cm)
        
        Tape level at the navel, relaxed. Drives WHR, WHtR, and central-dominance scoring.

**Hip Circumference** (cm)
        
        Widest point around glutes. Used for WHR + shape balance (upper vs lower).

**Chest Circumference** (cm) — optional
        
        Nipple line, relaxed, arms down. Improves shape archetype (V/A/X/Rectangle).

**Neck Circumference** (cm) — optional
        
        Just below Adam’s apple. Enables Navy body-fat % estimate.

Calculate Somatic Composition
        Informational only — not medical advice.