What this calculator measures
Waist-to-height ratio (WHtR) compares waist circumference directly to height, giving a simple screening signal for central (abdominal) fat accumulation. Research suggests WHtR is more predictive of cardiometabolic risk than BMI alone because it captures fat distribution, not just total body fatness.
How this calculator works
Ratio = waist circumference ÷ height (in the same units). A WHtR of 0.5 or below is generally considered healthy across different heights and sexes. Values between 0.5–0.6 indicate increased risk, and values above 0.6 indicate substantially elevated risk. 'Keep your waist to less than half your height' is the practical heuristic.
How to use your result
Measure your waist at the level of your navel, after a relaxed exhale, without sucking in. Use this as a complement to BMI and body fat percentage rather than in isolation. For people with high muscle mass, waist-to-height ratio is often a more informative risk marker than BMI. Monitor trends over time rather than optimising a single reading.
Important limitation
Calculator results are estimates. Pregnancy, eating disorders, medical conditions, injuries, or concerning symptoms require qualified professional guidance.