BMI tells you about overall body mass relative to height. It doesn’t tell you where that mass is distributed — and for cardiovascular and metabolic risk, distribution matters. Our Waist-to-Hip Ratio Calculator computes that different, complementary metric.
The calculation is deliberately simple
Waist-to-hip ratio is exactly what it sounds like: your waist circumference divided by your hip circumference, both measured in the same unit. Measure in centimeters or inches — it doesn’t matter, since the units cancel out and you’re left with a unitless ratio (like 0.85).
Why the risk thresholds differ by sex
The World Health Organization’s risk categories aren’t the same for men and women: a ratio at or above 0.90 is considered high risk for men, while for women that threshold is lower, at 0.85. This isn’t an arbitrary double standard — it reflects genuine average differences in body fat distribution between sexes, with women typically carrying more fat in the hip/thigh region and men more centrally around the abdomen, even at similar overall body fat percentages.
What it’s actually measuring
A higher waist-to-hip ratio indicates a higher proportion of central (abdominal) fat relative to hip/gluteal fat. Research consistently links higher abdominal fat specifically to increased cardiovascular and metabolic risk — this is part of why waist-to-hip ratio (and the related waist circumference alone) is sometimes considered a more informative risk indicator than BMI for people at a similar overall body weight but different fat distribution patterns.
An example
Entering a waist of 85 cm and hip of 100 cm for a male gives a ratio of 0.85 — below the 0.90 threshold, so it’s categorized as “Low risk” per WHO guidelines. The same 0.85 ratio for a female would instead read right at the boundary of the “Moderate risk” category, since the female threshold sits lower.
This is a reference calculation, not a diagnosis
This tool applies general WHO population guidelines — it doesn’t replace a personalized assessment from a healthcare provider who can weigh your waist-to-hip ratio alongside your full health picture.
Try it yourself: Waist-to-Hip Ratio Calculator.