Waist to Hip Ratio Calculator

World Health Organization (WHO) Anthropometric Standards

The Waist-to-Hip Ratio (WHR) is the most widely validated anthropometric marker of visceral fat accumulation:

• The Formula:

WHR = Waist Circumference (inches or cm)Hip Circumference (inches or cm)

• WHO Clinical Cutoffs for High Risk / Central Obesity:

• Men: WHR 0.90 (Substantially increased risk of metabolic complications).

• Women: WHR 0.85 (Elevated cardiovascular and type 2 diabetes risk).

Android vs Gynoid Body Fat Morphology

• Android (Apple Shape): Fat is concentrated intra-abdominally (visceral fat) surrounding the liver, pancreas, and intestines. Highly lipolytic, releasing free fatty acids directly into the portal circulation and triggering insulin resistance, hypertension, and systemic inflammation.

• Gynoid: Fat is stored subcutaneously around the hips, buttocks, and thighs. Acts as a metabolic sink that traps fatty acids, exerting a protective cardiovascular effect.

How to Use This Calculator

Enter your Unit System — choose from Imperial (inches), Metric (cm), Waist Circumference (at narrowest point / navel) (e.g. 32), Hip Circumference (at widest point around buttocks) (e.g. 38), Biological Sex — choose from Male (WHO High Risk ≥ 0.90), Female (WHO High Risk ≥ 0.85), and Body Shape Benchmark — choose from Custom Measurements, Healthy Male (Waist 32" / Hip 38" → WHR 0.842 / Low Risk Pear), High Risk Android Male (Waist 40" / Hip 40" → WHR 1.000 / Apple Shape). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

Formula Reference: Waist to Hip Ratio Calculator

Input variables:

unitSystem — Unit System

waistCircumferenceValue — Waist Circumference (at narrowest point / navel)

hipCircumferenceValue — Hip Circumference (at widest point around buttocks)

biologicalSexSelect — Biological Sex

Computed outputs:

waistToHipRatioScore — Waist-to-Hip Ratio (WHR)

whoCardiometabolicRiskTier — WHO Cardiometabolic Risk Tier

bodyFatDistributionShape — Body Fat Distribution Shape

maxHealthyWaistForHipsInches — Max Safe Waist for Current Hips

maxHealthyWaistForHipsCm — Max Safe Waist for Hips (Metric)

Mathematical relationships extracted from calculation logic:

waistIn = unit === 'metric' ? rawWaist / 2.54 : rawWaist

hipIn = unit === 'metric' ? rawHip / 2.54 : rawHip

maxWaistLimit = selSex === 'male' ? hipIn 0.90 : hipIn 0.80

Standard: NIST Handbook 44 and BIPM SI unit definitions

Worked Example

A woman with a 34-inch waist and 38-inch hips calculates a WHR of 0.895, exceeding the WHO 0.85 threshold and highlighting elevated visceral cardiovascular risk.

Understanding Your Result

Percentages are relative values — context determines what is "good" or "bad." A 50% discount is significant; a 50% failure rate is alarming. Percentage change and percentage points are different: moving from 4% to 5% is a 1 percentage point increase, but a 25% relative increase. When comparing percentages across different base values, always check whether absolute differences are meaningful — a 10% improvement on a large base creates more absolute value than 10% on a small base.