Waist-Hip Ratio
A measure of fat distribution — central obesity indicates higher health risk.
Plain English
Patient-Friendly Explanation
Waist-to-hip ratio (WHR) compares your waist measurement to your hip measurement. It matters because where fat sits changes your health risk: fat around the middle, near the organs, is more harmful than fat on the hips and thighs. To measure it, stand relaxed, breathe out normally, then measure your waist at its narrowest point (roughly level with your navel, or the narrowest point between your lowest rib and hip bone) and your hips at their widest point. Divide waist by hips. For men, a ratio of 0.90 or less is generally considered healthy, and 0.95 or more signals raised risk. For women, 0.85 or less is healthy, and 0.90 or more signals raised risk. For Asian populations, the healthy waist ranges are tighter still, so take waist circumference on its own seriously too: keep it under 90cm for men and under 80cm for women.
Medical
Clinical Definition
Waist-to-hip ratio (WHR) is the ratio of waist circumference to hip circumference, used as an index of regional fat distribution. Cut-offs commonly used: raised risk at WHR >= 0.90 in men and >= 0.85 in women (WHO), with higher thresholds (>= 0.95 men, >= 0.90 women) denoting substantially increased risk. WHR predicts myocardial infarction and all-cause mortality independently of BMI; central (android) adiposity carries greater cardiometabolic risk than peripheral (gynoid) fat because visceral adipose tissue drains into the portal circulation, increasing hepatic exposure to free fatty acids and inflammatory adipokines. WHO Asia-Pacific guidance uses lower waist thresholds for Asian populations (men >= 90cm, women >= 80cm). Measurement reliability depends on protocol standardisation: measured at the midpoint between the lowest rib and iliac crest, at end-expiration, with the tape snug but not compressing tissue, and hips measured at the widest point of the buttocks. WHR is less useful at the extremes of BMI, where waist circumference alone is preferred.
Key Insight
Why It Matters
Waist-to-hip ratio explains why two people at the same weight can carry very different risks. Apple-shaped fat (around the middle) is metabolically active and linked to diabetes, high blood pressure and heart disease; pear-shaped fat (hips and thighs) is comparatively benign. This is why clinics measure waist and hip circumference, not just weight. The practical value: it is free, takes two minutes, needs only a tape measure, and predicts risk that the scale misses entirely. For Asian adults the thresholds are lower, so a measurement that looks acceptable by Western charts can already be worth acting on.
How to measure your waist-to-hip ratio
You need two measurements and a simple calculation. Do it in the morning, before meals, standing straight with a tape measure that is snug but not tight.
- Waist: measure at the narrowest point between the ribs and the top of the hip bone (about level with the navel) after breathing out normally.
- Hip: measure at the widest point around the buttocks.
- Calculate: divide the waist measurement by the hip measurement (both in the same units).
What the numbers mean
The World Health Organization uses these cut-offs for substantially increased metabolic risk:
- Men: 0.90 or above = higher risk
- Women: 0.85 or above = higher risk
- Below these levels = lower risk (but your doctor still looks at waist alone, blood pressure, blood sugar and lipids together)
Why it matters more than BMI alone
Where you carry fat matters as much as how much you carry. Fat around the abdomen (central obesity) is metabolically active tissue that raises inflammation, insulin resistance and cardiovascular risk — the 'apple' shape. Fat around the hips and thighs (the 'pear' shape) is comparatively protective. Two people can share the same BMI with very different health profiles; waist-to-hip ratio captures the difference that BMI misses.
How to improve your ratio
The ratio improves when waist circumference falls. The same tools that drive overall weight loss work best, and abdominal fat is usually the first fat to mobilise:
- A modest calorie deficit — losing even 5% of body weight measurably shrinks waist circumference
- Regular activity — walking and resistance training both reduce visceral fat
- Less added sugar and alcohol — both preferentially deposit abdominal fat
- Adequate sleep — short sleep raises the hormones that drive central fat storage
Common questions
What is a healthy waist-to-hip ratio?
For men, below 0.90; for women, below 0.85. Levels at or above these cut-offs indicate substantially increased metabolic and cardiovascular risk, though waist circumference alone (90 cm in Asian men, 80 cm in Asian women) is an equally useful simple check.
How do I measure my waist-to-hip ratio at home?
Measure your waist at the narrowest point (about navel level) after breathing out, and your hips at the widest point around the buttocks, both with a tape measure. Divide waist by hip. Use the same units for both.
Which is more important — waist-to-hip ratio or BMI?
They answer different questions. BMI tells you how much you weigh relative to your height; waist-to-hip ratio tells you where the fat sits. Central obesity raises risk even at a normal BMI, so the ratio adds information BMI cannot. The clinic checks both, plus body composition, at assessment.
Can waist-to-hip ratio change with weight loss?
Yes — and usually faster than you expect. Abdominal fat is typically mobilised early in weight loss, so waist circumference falls before the scale moves much. Re-measuring every few weeks shows progress the scale may hide.
Sources
Reviewed against standard medical references.
Medically reviewed by
Family Physician & Registered Acupuncturist, Accord Medical Clinic. MBBS (NUS), Graduate Diploma in Family Medicine (NUS), Graduate Diploma in Acupuncture (Singapore College of TCM).
Last reviewed: August 2026
This page is general health education, not medical advice. Whether any treatment is appropriate for you is a decision made in consultation after assessment.
