Waist-to-Hip Ratio Calculator

How is the ratio calculated?

The code divides the waist figure by the hip figure and shows the result to three decimals. Because both numbers are divided, the unit cancels out, so 80 cm over 95 cm and the same body measured in inches give the same ratio. Enter both measurements in the same unit.

What cut-offs decide the risk label?

For men the label is Low risk below 0.85, Moderate risk from 0.85 up to just under 0.90, and High risk at 0.90 or above. For women the steps are below 0.80, 0.80 to just under 0.85, and 0.85 or above. The 0.90 and 0.85 lines are the commonly cited abdominal-obesity cut-offs; the moderate bands are this tool’s own grouping.

What happens exactly at 0.90 for a man?

It is classed as High risk, and the body-shape line now agrees. Earlier the shape test used a strict greater-than while the risk test used greater-than-or-equal, so a ratio of exactly 0.900 could read High risk and Pear shape together. Both now treat the boundary the same way.

What does the Apple and Pear shape line mean?

It is a plain two-way split at the same threshold as the High risk label: at or above 0.90 (men) or 0.85 (women) is called Apple, anything lower is called Pear. It describes where measurements sit, not a medical finding, and the intermediate band is still called Pear.

What input errors does it catch?

A waist or hip of zero (which is also what a cleared box becomes) or a negative number returns an error. If the hip is less than half the waist, the tool assumes a typing mistake and asks you to check. It cannot detect a swapped pair or a mix of units, such as a waist in inches with hips in centimetres.

Does the sex setting change the maths?

Only the thresholds. The ratio is the same for any two numbers; the sex selection picks which set of cut-offs applies. If you are pregnant, a child, or your body does not fit the male or female tables, the labels may not apply to you.

Does this replace a health check?

No. A tape-measure ratio is one rough indicator and says nothing about blood pressure, blood sugar or family history. This is general information, not medical advice, so discuss concerns with a doctor or nurse.