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Waist-to-hip and waist-to-height ratios

Calculate two ratios from body measurements in the same unit. Measure carefully rather than treating a ratio as a diagnosis.

Start with your own numbers

Editable example

An example is filled in. Replace it with your own data to calculate.

Use centimeters for waist, hips and height, following a consistent measurement method.

Enter waist circumference (cm), for example 80. Use the displayed unit; replace the example with your own value.
Enter hip circumference (cm), for example 100. Use the displayed unit; replace the example with your own value.
Enter height (cm), for example 170. Use the displayed unit; replace the example with your own value.

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Example result

Waist-to-hip ratio

0.8

Ratios describe proportions and are not diagnoses. Follow the source's measuring method rather than substituting trouser waist size.

Waist-to-height ratio0.470588

Waist-to-hip ratio = waist ÷ hips; waist-to-height ratio = waist ÷ height. Measure waist midway between the lowest palpable rib and top of the iliac crest, and hips at the widest point, with the tape level after a natural exhalation. Ratios describe measurements only; this tool does not diagnose disease, body fat or weight-loss targets from a single threshold.

Method and scope

Waist-to-hip ratio is waist divided by hip. Waist-to-height ratio is waist divided by height; both are unitless.

Measure waist midway between the lowest palpable rib and the top of the hip bone, and hips around their widest point. Keep the tape horizontal and measure after a normal exhalation.

The tool describes the entered measurements without assigning disease, body-fat or weight-loss targets from a single cutoff. Measurement technique and individual clinical context affect interpretation.

References:WHO: expert report on waist circumference and waist-to-hip ratio

What this helps you do

Calculate two ratios from body measurements in the same unit. Measure carefully rather than treating a ratio as a diagnosis.

What to enter

Start with waist circumference (cm), then fill the other relevant fields in the units shown. The field hints explain the required format and examples.

How the calculation works

Waist-to-hip ratio is waist divided by hip. Waist-to-height ratio is waist divided by height; both are unitless.

Worked example

A waist of 80 cm, hips of 100 cm and height of 160 cm give ratios of 0.8 and 0.5 respectively. Keep all three measurements in centimetres.

Understanding the answer

Measure waist midway between the lowest palpable rib and the top of the hip bone, and hips around their widest point. Keep the tape horizontal and measure after a normal exhalation.

Scope and limitations

The tool describes the entered measurements without assigning disease, body-fat or weight-loss targets from a single cutoff. Measurement technique and individual clinical context affect interpretation.

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