Waist-to-Hip Ratio Calculator

Waist-to-hip ratio (WHR) is calculated by dividing your waist circumference by your hip circumference. The World Health Organisation uses WHR as an indicator of central obesity and associated health risks, including cardiovascular disease and type 2 diabetes. It is considered a better predictor than BMI alone for certain conditions.

WHO defines abdominal obesity as a WHR above 0.90 for men and above 0.85 for women. A ratio below these thresholds is associated with lower risk. The NHS also recommends monitoring waist circumference independently: above 94 cm (men) or 80 cm (women) indicates increased risk, and above 102 cm (men) or 88 cm (women) indicates high risk.

Measure your waist at the midpoint between the lowest rib and the top of the hip bone (iliac crest), and your hips at the widest point of the buttocks. Use a flexible tape measure on bare skin, standing and breathing normally.

What is waist-to-hip ratio (WHR)? Measure of fat distribution. WHR = waist circumference ÷ hip circumference. WHO classification: low risk men <0.90, women <0.85; moderate risk men 0.90-0.99, women 0.85-0.89; high risk men ≥1.00, women ≥0.90. Better predictor of cardiovascular disease and type 2 diabetes than BMI for some populations. Reflects 'apple-shaped' (visceral fat — high risk) vs 'pear-shaped' (subcutaneous fat — lower risk).

How to measure correctly. Waist: midway between lowest rib and top of hip bones (NOT at belly button or trouser line). Measure standing relaxed, exhale gently, don't suck in. Hips: widest part of buttocks. Both measurements horizontal, snug but not compressed. Same time of day (morning ideal, before food). Average UK adult waist 2024: men 96cm (38"); women 87cm (34"). Hip: men 102cm (40"); women 102cm (40"). Sample healthy: man 90cm waist / 102cm hip = 0.88 (low risk).

WHR vs BMI — which matters more? WHR detects visceral fat (around organs) — strongly linked to heart disease, type 2 diabetes, stroke. BMI measures overall weight relative to height. Muscular athletes: high BMI but low WHR (good). Skinny-fat individuals: normal BMI but high WHR (worse health outcomes than overweight + low WHR). Combine both metrics. NHS guidance: waist circumference under 94cm (men) / 80cm (women) — low risk; 102cm (men) / 88cm (women) high risk.

Waist-to-height ratio — emerging alternative. WHtR = waist ÷ height (same units). 'Keep waist less than half your height' — simpler rule than WHR. Target: WHtR <0.5. Sample: 1.75m height = 87.5cm max waist. Better than BMI for predicting health risks across all body types and ethnicities (Asian populations especially). Used in NHS Health Check program. Children: WHtR more reliable than children's BMI growth charts for assessing visceral fat risk.

Reducing waist circumference. Loss of visceral fat occurs 2-3× faster than subcutaneous fat with weight loss — so waist often shrinks faster than overall weight. Methods: caloric deficit (500-1,000 kcal/day) → 0.5-1 kg/week loss. Strength training preserves muscle. HIIT (high intensity interval training): more effective at reducing visceral fat than steady-state cardio. Sleep 7-9 hours: under 6 hours sabotages visceral fat loss. Alcohol: especially beer correlates with abdominal fat. Stress: cortisol drives central fat storage.