Waist to Height Ratio Calculator

Waist-to-Height Ratio Calculator

Fat around your middle matters more for your health than your weight alone. The waist-to-height ratio is one of the simplest ways to check it.

Last updated 10 October 2026 · Written for patients in Ireland

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How to measure your waist

Stand up straight and breathe out naturally
Find the point halfway between your lowest rib and the top of your hip bone — often around the belly button
Wrap a tape measure around, level and snug but not tight
Read the measurement in centimetres

What your ratio means

Under 0.4 — low; check your BMI too
0.4 to 0.49 — healthy
0.5 to 0.59 — increased health risk
0.6 or more — high health risk

Why it is useful

Fat stored around the organs is linked to type 2 diabetes, high blood pressure and heart disease. The ratio works across different heights and builds, which is why many health services use the simple rule: keep your waist to less than half your height.

Frequently asked questions

Is waist-to-height ratio better than BMI?

They measure different things. Waist-to-height reflects fat around the middle, which is closely linked to heart and diabetes risk; using both gives a better picture.

What is a healthy waist-to-height ratio?

Between 0.4 and 0.49 for most adults.

Official sources and further reading

HSE: obesity

This page is general information for patients in Ireland, not a diagnosis or personal medical advice. If you are worried about your health, speak to a doctor. In an emergency call 112 or 999.

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