Waist-to-Hip Ratio (WHR)
body-metricWaist circumference divided by hip circumference.
Definition
Waist circumference divided by hip circumference. Assesses central obesity (visceral fat distribution). WHO risk thresholds: men >0.90, women >0.85. A strong predictor of cardiovascular disease risk.
What Is Waist-to-Hip Ratio?
Waist-to-Hip Ratio (WHR) is a simple anthropometric measurement that compares the circumference of the waist to that of the hips. It is used as a proxy for abdominal fat distribution and is a well-established predictor of cardiometabolic risk, independent of total body weight or BMI. The ratio reflects the degree of central obesity — the accumulation of fat around the abdomen — which is more strongly associated with metabolic disease than peripheral fat stored in the thighs and buttocks.
How WHR Is Measured and Interpreted
The formula is:
- WHR = Waist circumference ÷ Hip circumference
Waist is measured at the narrowest point between the ribs and iliac crest (or at the navel if no narrowing is present), while hip circumference is measured at the widest point of the buttocks. Both measurements are taken without clothing, without breath-holding, and to the nearest 0.1 cm.
WHO risk thresholds:
| Risk Level | Men | Women |
|---|---|---|
| Low risk | Below 0.90 | Below 0.80 |
| Moderate risk | 0.90 – 0.99 | 0.80 – 0.85 |
| High risk | 1.00 and above | 0.86 and above |
Why WHR Matters
Research consistently shows that individuals with an "apple-shaped" fat distribution (high WHR) face significantly greater risks of type 2 diabetes, hypertension, dyslipidemia, coronary artery disease, and stroke compared to those with a "pear-shaped" distribution (lower WHR), even when total body weight is similar. WHR captures fat distribution information that BMI cannot, making it a complementary tool in cardiovascular risk assessment. Waist circumference alone is also predictive: values above 102 cm in men and 88 cm in women are independently associated with elevated cardiometabolic risk according to the National Institutes of Health. WHR can improve with aerobic exercise, resistance training, and dietary modifications that reduce visceral fat accumulation.