How it works
Waist-to-height ratio (WHtR) divides waist circumference by height. It reflects fat carried around the middle, which is more closely tied to heart and metabolic health than overall weight.
A widely used guide is "keep your waist to less than half your height," meaning a ratio under 0.5. The UK's NICE guidance (2022) uses 0.5 to 0.59 as increased risk and 0.6 or more as high risk for adults. Unlike BMI, the same cut-offs apply across sexes and most ethnic groups.
It is a screening measure only and works alongside other information about your health. Results are estimates, not medical advice.
Formula
WHtR = waist circumference ÷ height (same units)
Questions people ask
What is a healthy waist-to-height ratio?
Under 0.5 for most adults, meaning your waist is less than half your height. Ratios of 0.5 to 0.59 suggest increased risk, and 0.6 or more higher risk.
How do I measure my waist correctly?
Stand relaxed and measure midway between your lowest rib and the top of your hip bone, roughly level with the belly button. Breathe out normally and keep the tape snug but not tight.
Is waist-to-height ratio better than BMI?
Studies suggest it predicts heart and metabolic risk at least as well as BMI and often better, because it reflects where fat is carried. Many clinicians now use both.