Guides · Updated November 2026
Waist-to-hip ratio: how to calculate it and what it shows
The ratio between waist and hips describes body shape: how much fat sits around the abdomen compared with the hips.
Calculate your waist-to-hip ratio
Use the same unit for both (centimetres or inches).
The calculation runs in your browser: we do not store or send your data.
How to calculate it
Divide your waist circumference by your hip circumference, using the same unit. For example, a 31-inch waist and 39-inch hips give 31 ÷ 39 = 0.79.
Measure your waist halfway between your lowest rib and the top of your hip bone, and your hips at the widest part of your buttocks.
WHO reference values
In the report of its expert consultation, WHO gives values above which the risk of metabolic complications is substantially increased. Unlike other indicators, the thresholds differ by biological sex, because fat distribution differs.
| Reference | Value |
|---|---|
| Biological female | 0.85 or more |
| Biological male | 0.90 or more |
That is why the Kariko report shows your ratio without classifying it: you can compare it with the table yourself.
Waist-to-hip or waist-to-height?
Both describe abdominal fat. The waist-to-height ratio has two practical advantages: it needs only one circumference and it uses the same thresholds for everyone. In its 2025 guideline, NICE recommends the waist-to-height ratio alongside BMI.
The waist-to-hip ratio is still useful as extra information, especially if you track it over time and always measure the same way.
Frequently asked questions
What is a normal waist-to-hip ratio?
WHO does not set a “normal” range, but gives values above which risk is substantially increased: 0.85 for biological females and 0.90 for biological males.
Where do I measure my hips?
Standing with your feet together, at the widest part of your buttocks, with the tape level and not too tight.
Which is better, waist-to-hip or waist-to-height?
They complement each other. The waist-to-height ratio is simpler, uses the same thresholds for everyone and is the one NICE recommends alongside BMI.
Sources
- WHO – Waist circumference and waist-hip ratio: report of a WHO expert consultation
- NICE NG246 – Overweight and obesity management (2025)
This guide is for information only and summarises public WHO and NICE references. It is not a diagnosis and does not replace advice from a health professional.