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About this tool
A quick health screen: your waist size divided by your height, with a category.
The Waist-to-Height Ratio Calculator divides your waist circumference by your height in the same units and places the result in one of four bands — below 0.40 Low, 0.40 to under 0.50 Healthy, 0.50 to under 0.60 Increased Risk, and 0.60 or above High Risk. It also shows the waist measurement that would put you at exactly 0.50, half your height, and how many centimetres you are above or below it. WHtR is a screening indicator of central body fat, not a diagnosis — it is information to take to a clinician, not a verdict.
Open Waist to Height Ratio Calculator on AltFTool — it loads instantly in your browser.
Type your measurement into 'Waist Circumference (cm)' in the Inputs panel — it opens pre-filled with 80.
Set 'Height (cm)', which starts at 175; there is no calculate button, so the Result card recomputes on every keystroke and reads 0.46 with the caption Healthy at those defaults.
Read the ratio and its band, then the 'Risk Category', 'Health Advice', 'Recommended Max Waist', 'Difference from Target' and 'Healthy Target Ratio' tiles, and press Copy to put the whole summary on the clipboard.
Instead of an abstract ratio it converts the 0.50 threshold into the actual waist measurement for your height, and shows how far away you are.
An 85 cm waist means something different at 160 cm and 190 cm tall; dividing by height puts short and tall people on the same scale.
It flags ratios below 0.40 as well as high ones, rather than treating smaller as automatically better.
Below 0.50 — your waist should measure less than half your height. This calculator treats 0.40 to 0.50 as the healthy band, 0.50 to 0.60 as increased risk, and 0.60 and above as high risk. The 'keep your waist to less than half your height' rule is the widely used public-health message for adults.
Around the narrowest point between the bottom of your ribs and the top of your hip bones, or at the level of the navel if there is no obvious narrowing. Measure directly against the skin or over light clothing, standing relaxed at the end of a normal exhale, with the tape snug but not compressing the skin.
For central fat, generally yes — BMI cannot tell abdominal fat from muscle or from weight carried on the hips, whereas WHtR targets the fat around the organs that is most associated with cardiometabolic risk. Many clinicians use both together rather than either alone.
The under-0.50 guidance is aimed at adults. Children's cut-offs vary with age, and waist measurement is not a meaningful screen during pregnancy or shortly after. If you are in either group, or your result lands in a risk band, speak to a doctor rather than acting on this number alone.
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