Health & Wellbeing
Waist-to-Hip Ratio
Fat distribution as a heart-health marker.
Education and reference only. Not a substitute for clinical judgement, local policy or product labelling. Always verify before clinical use. Values are calculated in your browser and never stored.
Background
Waist-to-hip ratio divides waist circumference by hip circumference. It describes the pattern of fat distribution: a higher ratio means proportionally more fat around the abdomen (an "apple" shape) rather than around the hips and thighs (a "pear" shape). Abdominal fat sits around the internal organs and is more strongly associated with cardiovascular and metabolic risk than fat carried lower down.
Interpreting the result
Thresholds are sex-specific. The World Health Organization's definition of abdominal obesity uses a waist-hip ratio above 0.90 in men and above 0.85 in women. This calculator deliberately shows the ratio without a colour band, because the scoring engine has no sex input and a single set of bands would mislabel one sex — compare your result against the threshold for your sex instead. WHO also notes that appropriate cut-off points differ by population: evidence in Asian populations supports lower values, for example around 0.90 for men and 0.80 for women.
Advice
Risk thresholds differ by sex (roughly ≥0.85 for women and ≥0.90 for men indicate higher risk), so interpret alongside your overall health. Waist-to-height ratio is often preferred as a single simple measure.
Worked example
A woman with a waist of 84 cm and hips of 100 cm: 84 / 100 = 0.84, just below the 0.85 threshold. A man with the same measurements has a ratio of 0.84, comfortably below the 0.90 threshold that applies to him — the same number, two different readings.
Critical actions
Waist-to-hip thresholds differ by sex: roughly 0.85 or above for women, and 0.90 or above for men, indicate higher risk. Read your ratio against the threshold for your sex — a single number means different things for different people. Waist-to-height ratio is often preferred as a simpler measure.
Pearls / pitfalls
- Measure the hips at the widest point of the buttocks and the waist midway between the lowest rib and the top of the hip, both against the skin and after breathing out.
- Waist-to-hip ratio can stay flat during weight loss if the waist and hips shrink together — waist circumference alone often tracks change more visibly.
- For assessing central adiposity in UK adults with BMI under 35, NICE recommends waist-to-height ratio rather than waist-to-hip ratio.
- The ratio describes fat distribution only. It says nothing about blood pressure, lipids, glucose or fitness, all of which carry independent risk.
Evidence & validation
The 0.90 and 0.85 cut-offs are those reproduced in the report of the WHO Expert Consultation on Waist Circumference and Waist-Hip Ratio (Geneva, 8-11 December 2008), which sets out the WHO definition of abdominal obesity as a waist-hip ratio above 0.90 for males and above 0.85 for females, or a BMI above 30.0. That report also reviews population-specific evidence and concludes that appropriate cut-off points vary by ethnicity.
Frequently asked questions
What is a healthy waist-to-hip ratio?
Using the WHO definition of abdominal obesity, a ratio above 0.90 in men or above 0.85 in women indicates abdominal obesity. Below those values is the lower-risk range.
Why does this calculator not show a risk band?
Because the thresholds differ by sex and the calculator has no sex input. Showing one band for everyone would have labelled some people incorrectly, so the ratio is shown with the sex-specific thresholds stated instead.
Is waist-to-hip ratio better than BMI?
It captures fat distribution, which BMI cannot, but it is not a replacement. For UK adults with BMI under 35, NICE recommends waist-to-height ratio alongside BMI.
Do the thresholds vary by ethnicity?
Yes. WHO notes that appropriate cut-off points differ between populations, with evidence supporting lower values in Asian populations in particular.
How do I lower it?
The same measures that reduce central fat generally: a sustained modest calorie deficit, regular activity including some resistance work, adequate sleep, and limiting alcohol. There is no way to target fat loss to one area.
References
- World Health Organization. Waist circumference and waist-hip ratio: report of a WHO expert consultation, Geneva, 8-11 December 2008. Geneva: WHO; 2011.
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