How this calculator works
Waist-to-hip ratio divides waist by hip circumference in the same unit. This adult screening measure uses WHO thresholds of 0.90 for males and 0.85 for females. Measure the waist midway between the lowest rib and iliac crest, and hip at the widest gluteal circumference. BMI, ethnicity and other health factors affect interpretation; the thresholds do not apply during pregnancy. The result is an estimate for information only and is not medical advice.
Formula
WHR = waist / hip. High risk starts at 0.90 for males and 0.85 for females.
Worked example
A 32 in waist and 40 in hip give 0.80, below the female threshold. A male 40 in waist and 38 in hip give about 1.05.
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Frequently asked questions
Do both measurements need the same unit?
The unit selectors convert both to metres before division, so you may enter each in a different unit.
Does low risk mean no health risk?
No. This is a single screening measure and does not assess overall health.
What if the waist and hip measurements are equal?
The ratio is 1.0, which is at or above both thresholds, so it is reported as high risk.