Waist-to-Hip Ratio Calculator

The calculation is waist ÷ hip, with both measurements taken in the same unit so that the units cancel and the result is a pure number. A waist of 85 and hips of 100 give 85 ÷ 100 = 0.85, whether those figures are centimetres or inches. That cancellation is convenient, and it is also what makes the ratio slipperier than it first appears. The same 0.85 can come from a 68/80 pair or a 102/120 pair, and those are not the same body in any meaningful sense. The ratio describes shape and deliberately discards scale. Everything useful and everything misleading about it follows from that single design choice.

What WHR tries to capture is where body fat is stored. Fat carried around the abdomen — the pattern sometimes called android, or the "apple" shape — is more strongly associated with insulin resistance, type 2 diabetes and cardiovascular disease than fat carried on the hips and thighs, the gynoid or "pear" pattern. Hip and thigh fat appears comparatively benign metabolically. Dividing waist by hip is a crude way of expressing which of the two patterns dominates. Crude or not, it captures something BMI structurally cannot, because BMI has no way of knowing where any of the mass is sitting. That is the case for measuring it at all.

The cut-offs used here come from a WHO expert consultation: a ratio above 0.90 in men and above 0.85 in women is described as marking substantially increased risk of metabolic complications. As with every threshold of this kind, these are lines drawn across a continuous relationship to make screening possible. Nothing changes about a person between 0.84 and 0.86, and the numbers themselves carry no diagnosis. They also apply to adults only. They are not valid for children or teenagers, and they do not apply during pregnancy, when abdominal girth reflects the pregnancy rather than fat distribution. The same WHO consultation noted that the relationship between these measurements and risk varies between population groups, which is another reason to take the result to a clinician rather than to a table.

A ratio contains two measurements, so it inherits two sources of error — and the hip measurement is the weaker of the pair. Waist protocols are at least well documented and debated; the hip measurement, taken at the widest point around the buttocks, is harder to place consistently and is affected by clothing, stance and muscle. There is a subtler problem that matters more. Because the hip sits in the denominator, the ratio rises whenever the hip measurement falls — including when it falls for reasons that are not good news. Losing gluteal and thigh muscle pushes WHR up in exactly the same way as gaining abdominal fat, and the number cannot tell you which of the two happened. In older adults especially, a "worsening" ratio can reflect muscle loss rather than fat gain. The ratio can also sit perfectly still through meaningful weight loss, when waist and hip shrink together. That is not a malfunction — it is the ratio doing precisely what it was designed to do.

Because of all that, WHR is best read alongside the raw waist measurement rather than in place of it. Waist circumference keeps the scale that the ratio throws away, and the two together say more than either alone. BMI adds a third piece: overall weight relative to height. None of the three is a diagnosis, and none of them sees blood pressure, blood glucose, blood lipids, family history, medication or fitness — the factors that actually determine cardiometabolic risk. If you intend to track the ratio, measure the same way each time, at the same time of day, and pay attention to the direction rather than the third decimal place. A result above the threshold is a reason to have the rest checked by a clinician. This page divides one measurement by another and explains what the result is reaching for. It does not diagnose, and it does not tell you what to eat, how to train or what shape to be.