Guides · Updated November 2026
Waist-to-height ratio: how to calculate it and what it means
It is one of the simplest indicators around: all you need is a tape measure. It shows whether fat tends to sit around the abdomen, which BMI alone cannot tell you.
Calculate your waist-to-height ratio
Use the same unit for both (centimetres or inches).
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How to calculate it
Divide your waist circumference by your height, using the same unit. For example, a 32-inch waist and a height of 68 inches give 32 ÷ 68 = 0.47. In centimetres, 80 cm and 170 cm give the same result.
The rule of thumb from NICE, the UK body that produces health guidelines, is simple: keep your waist to less than half your height.
Reference values
| Ratio | What it means |
|---|---|
| 0.4 – 0.49 | Healthy central adiposity |
| 0.5 – 0.59 | Increased central adiposity |
| 0.6 or more | High central adiposity |
The thresholds are the same for all adults regardless of sex, ethnicity and age, and they also apply to people with high muscle mass. NICE recommends using them alongside BMI in adults with a BMI below 35.
Why it is useful
Fat stored around the abdominal organs is the type most closely linked to type 2 diabetes, high blood pressure and cardiovascular disease. BMI relates weight to height but does not say where fat is stored: the waist-to-height ratio fills that gap.
It is also easy to repeat over time: if you always measure the same way, you can see how it changes without scales or special equipment.
Getting a reliable measurement
- Stand up, relax your stomach and breathe normally.
- Place the tape halfway between your lowest rib and the top of your hip bone.
- Read the measurement at the end of a normal breath out, without pulling the tape tight.
- Always measure at the same time of day with the same tape.
You will find a step-by-step explanation in the guide on how to measure your waist.
Frequently asked questions
What is a good waist-to-height ratio?
According to NICE, a value between 0.4 and 0.49 indicates healthy central adiposity. From 0.5 to 0.59 it is increased, and from 0.6 it is high.
Are the thresholds different for men and women?
No. Unlike the waist-to-hip ratio, NICE uses the same waist-to-height thresholds for all adults.
Does it work for very muscular people?
Yes. NICE states that the thresholds also apply to adults with high muscle mass, for whom BMI can be misleading.
Sources
- NICE NG246 – Overweight and obesity management (2025)
- WHO – Waist circumference and waist-hip ratio: report of a WHO expert consultation
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.