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Waist-to-Height Ratio Calculator
Free waist-to-height ratio calculator: check fat around the middle with NICE's bands (healthy 0.4–0.49, increased risk 0.5–0.59, high 0.6+). Metric or inches, with how to measure.
Waist-to-height ratio
A quick check of fat around the middle. NICE says: keep your waist to less than half your height.
Your waist-to-height ratio
How to measure your waist
- Find the bottom of your ribs and the top of your hips.
- Wrap a tape measure around your middle, halfway between them.
- Breathe out naturally and measure. Don't pull the tape tight.
✅ Rules last checked:
📚 Official sources: NICE NG246: Overweight and obesity management (waist-to-height ratio)
We build every tool from the official rules and re-check them when they change. Always confirm with the official source before you rely on a result.
🛠️ Spotted a mistake or an out-of-date rule? Tell us
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Questions people ask
Why waist and not just BMI?+
Fat around the middle is more closely linked to type 2 diabetes and heart disease. NICE suggests using waist-to-height ratio alongside BMI.
Does it work for everyone?+
It's for adults with a BMI under 35, including people with a lot of muscle. It's not for pregnancy.