Formula
WHtR = Waist ÷ Height
Example: A 34-inch waist and a height of 69 inches (5′9″) give a ratio of 0.49 — in the healthy range. To stay below 0.5, the waist should be under 34.5 inches.
Categories (NICE 2022)
- 0.4 to 0.49: healthy central adiposity
- 0.5 to 0.59: increased health risks
- 0.6 or more: further increased health risks
Not suitable for pregnant women or children under 5. Compare with your BMI.
Frequently asked questions
How do I calculate waist-to-height ratio?
Divide your waist measurement by your height, in the same units. A 34-inch waist and a height of 69 inches give a ratio of 0.49.
What is a healthy waist-to-height ratio?
The UK’s NICE guideline (2022) classes 0.4–0.49 as healthy, 0.5–0.59 as increased health risk and 0.6 or more as high risk.
How do I measure my waist?
Stand, breathe out normally and measure halfway between your lowest rib and the top of your hip bone, keeping the tape level.
Is WHtR better than BMI?
It captures belly fat, which is linked to type 2 diabetes and heart disease, so it adds information BMI misses. Using both gives a fuller picture.