Waist-to-Hip Ratio Calculator
Calculate your Waist-to-Hip Ratio (WHR) — a key predictor of cardiovascular and metabolic risk. Get your WHO risk classification instantly.
Measure waist at the navel. Measure hip at the widest point of the buttocks.
Quick Answer
Waist-to-Hip Ratio = waist circumference ÷ hip circumference. WHO risk thresholds for men: low risk below 0.85, high risk above 0.95. For women: low risk below 0.75, high risk above 0.85. WHR predicts cardiovascular mortality better than BMI because it measures visceral fat distribution — the most metabolically dangerous fat type.
Why Waist-to-Hip Ratio Predicts Health Better Than BMI
Waist-to-hip ratio (WHR) measures the ratio of your waist circumference to your hip circumference. It is one of the most powerful predictors of cardiovascular and metabolic risk available from simple anthropometric measurements. A 2020 study published in JAMA Network Open found that WHR outperformed BMI in predicting cardiovascular mortality across all BMI categories — including people with a "normal" BMI. This is because WHR captures fat distribution, which BMI completely ignores.
The critical distinction is between visceral fat (stored around the abdominal organs, inside the peritoneal cavity) and subcutaneous fat (stored under the skin). Visceral fat is metabolically active — it releases inflammatory cytokines, disrupts insulin signalling, and raises cardiovascular risk markers in ways that subcutaneous fat does not. People with central or apple-shaped fat distribution (high waist relative to hips) carry predominantly visceral fat, which is why WHR is such a strong metabolic risk predictor.
WHO Risk Thresholds Explained
The World Health Organisation classifies WHR risk as follows. For men: low risk below 0.85, moderate risk 0.85–0.95, high risk above 0.95. For women: low risk below 0.75, moderate risk 0.75–0.85, high risk above 0.85. These thresholds are based on population studies linking WHR to rates of type 2 diabetes, cardiovascular events, and all-cause mortality. Crossing the high-risk threshold meaningfully increases your probability of metabolic complications over a 10-year horizon.
Notably, a person with a BMI in the healthy range (18.5–24.9) can have a high-risk WHR if their fat is centrally distributed. This profile — sometimes called "TOFI" (thin outside, fat inside) — carries similar metabolic risk to overt obesity and would be completely missed by BMI screening alone. WHR catches this hidden risk.
How to Reduce Your WHR
You cannot spot-reduce waist fat through targeted exercise — fat loss is systemic. The most effective strategies for reducing waist circumference: sustained caloric deficit (500 kcal/day below TDEE), reducing dietary refined carbohydrates and added sugars (which specifically promote visceral fat deposition), increasing dietary fibre (targets visceral fat preferentially), resistance training 3–4 times per week, 7–9 hours of sleep per night (sleep deprivation elevates cortisol, which drives abdominal fat), and reducing alcohol (particularly beer and spirits, which are strongly associated with central adiposity).
Measurement accuracy
Measure waist at the narrowest point (navel level, relaxed — do not suck in). Measure hip at the widest point of the buttocks. Take measurements in the morning, before eating, consistently each time for reliable trend tracking.