Calculate waist-to-hip ratio and assess health risk categories with visual indicators.
Waist-to-hip ratio (WHR) is the waist measurement divided by the hip measurement, and it exists because where fat sits matters as much as how much there is. The tool takes two numbers, computes the ratio, and maps it to a risk category shown with a visual indicator, using the World Health Organization cutoffs of 0.90 for men and 0.85 for women. What people most often misread: the result is not a percentage, it can exceed 1.0 (waist bigger than hips), and the same value means different things by sex, so 0.88 is low risk for a man but high risk for a woman.
A concrete input and expected output from the current implementation.
Input
Sex: male. Waist: 100 cm. Hips: 96 cm.
Expected output
Waist-to-hip ratio 1.04. Category: high risk (at or above the WHO cutoff of 0.90 for men).
100 divided by 96 is 1.0417, rounded to two decimals, so the ratio is 1.04. Because the waist is larger than the hips the ratio exceeds 1.0, and it clears the 0.90 threshold, which places this measurement in the substantially increased risk zone.
The tool divides waist circumference by hip circumference in the same unit and rounds to two decimal places. The ratio is dimensionless, so inches and centimeters give the same number as long as both measurements share a unit. Typical values run from about 0.7 to 0.95 in the healthy range, and anything above 1.0 simply means the waist is bigger than the hips.
Fat distribution norms differ by sex, so the tool applies different thresholds: for men, 0.90 or above flags substantially increased risk, while for women the flag is 0.85 or above. The category drives the visual indicator the tool renders rather than a medical verdict. Some versions split the lower range into separate low and moderate bands.
Not necessarily. A ratio above 1.0 just means the waist is larger than the hips, which is common in men with abdominal fat and lands in the high-risk zone. Do confirm both numbers used the same unit: mixing inches for one and centimeters for the other inflates the ratio and can push the category up artificially.
Either, as long as both measurements use the same unit. The ratio is unitless, so 78 cm divided by 95 cm and 30.7 in divided by 37.4 in both give 0.82. Consistency matters more than the choice: use the same unit and the same measuring protocol at each visit so changes in the ratio reflect your body rather than a change of method.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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