Free tool
Waist-to-height ratio
One of the simplest checks of belly fat, the kind most linked to diabetes and heart disease: keep your waist to less than half your height.
Your measurements
Sex (optional, for waist cut-offs)
Enter your height and waist to see your ratio. Nothing you type leaves your device.
For general education only, not a diagnosis. Results don't replace advice from a licensed doctor or dietitian.
How to measure your waist
- Stand up straight and breathe out normally.
- Wrap a tape measure around your bare belly, roughly at belly-button level, midway between your lowest rib and the top of your hip bone.
- Keep the tape snug but not tight, and level all the way around.
What the numbers mean
- 0.40 to 0.49: healthy
- 0.50 to 0.59: increased health risk
- 0.60 or more: high health risk
For Asian adults, a waist of 90 cm or more in men, or 80 cm or more in women, is also commonly used as a sign of increased risk.
Why it can beat BMI
BMI can't tell where fat is stored. Fat around the organs (visceral fat) is the most harmful, and waist size reflects it better. Use this alongside the BMI calculator for a fuller picture.
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