What does this tool do?
Waist-to-height ratio compares belly circumference with height and is used as a simple central-obesity screen. Keeping the ratio below 0.5 is a common public-health guideline, regardless of sex.
The Formula
Waist-to-height ratio = Waist circumference ÷ HeightFrequently Asked Questions
Why is 0.5 a common cutoff?
A ratio above 0.5 means your waist is more than half your height, which is associated with higher cardiometabolic risk in population studies. It is a screening signal, not a diagnosis.
How should I measure my waist?
Measure at the midpoint between the lowest rib and the top of the hip bone, after a normal exhale, without pulling the tape tight. Keep the tape level.