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Waist-to-Height Ratio Calculator

Enter your height and waist circumference in the units you prefer to get your waist-to-height ratio as a decimal and a percentage. General adult reference ranges are shown for education only. For adults aged 18 and over. Calculated locally and never stored.

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1. Measurements

Adults 18+

Both measurements are converted to centimetres (1 in = 2.54 cm, 1 m = 100 cm) before dividing.

2. Result

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Enter your age, height and waist, then press Calculate ratio.
About this tool

About Waist-to-Height Ratio Calculator

Waist-to-Height Ratio Calculator divides waist circumference by height to give the waist-to-height ratio (WHtR) as a decimal and a percentage. Height can be entered in centimetres, metres, inches, or feet and inches, and waist in centimetres or inches. The result is shown next to general adult screening bands, labelled as educational reference ranges only.

Waist-to-height ratio is a simple measurement that needs only a tape measure and is easy to compare over time. Because both measurements are in the same unit, the ratio itself has no unit, and this calculator handles any mix of metric and imperial input for you.

How to use

Step by step

  1. Enter your age (18 or over).
  2. Choose a height unit and enter your height.
  3. Measure your waist, enter it and choose centimetres or inches.
  4. Press Calculate ratio.
  5. Read the ratio, percentage and reference range, then copy or download the summary.
Key features

What it offers

  • Height in cm, m, inches or feet and inches; waist in cm or inches
  • Ratio to two decimal places and percentage to one decimal place
  • Four general adult reference bands, with your rounded result highlighted
  • Conversions and the division shown step by step
  • Checks for implausible measurements and ratios
  • Copy and Download summaries that match the result on screen
Best practices

Tips for best results

  • Measure your waist on bare skin after breathing out normally.
  • Keep the tape level and snug without compressing the skin.
  • Use the same measuring point each time so results are comparable.
  • Take two readings and use the average.
Benefits

Why people use it

Simple

Only height and a waist measurement are needed.

Any units

Mix metric and imperial freely.

Private

Measurements stay in your browser.

FAQ

Common questions

Waist-to-height ratio (WHtR) is waist circumference divided by height, with both in the same unit. For example, a waist of 80 cm and a height of 170 cm give 80 ÷ 170 = 0.47, or 47%. The calculator converts both values to centimetres first, so you can mix units.
Height can be entered in centimetres, metres, inches, or feet and inches. Waist can be entered in centimetres or inches. Conversions use 1 in = 2.54 cm, 1 ft = 12 in and 1 m = 100 cm.
The page lists four general adult screening bands — below 0.40, 0.40–0.49, 0.50–0.59, and 0.60 and above — and highlights the band your rounded ratio falls in. They are educational reference ranges only. Measurements and their interpretation vary by person, and the result is not a diagnosis.
A common method is to measure around the bare abdomen midway between the lowest rib and the top of the hip bone, after breathing out normally, with the tape level and snug but not compressing the skin. Different guidelines use slightly different sites, so use the same method each time.
Tape measurements are rarely precise beyond a few millimetres, so two decimal places is a practical level of detail. The reference band is chosen from the same rounded ratio that is displayed, so the two always agree.
The reference ranges shown are general adult bands. Waist and height measurements in children and teenagers are usually interpreted differently, so the calculator only shows results for people aged 18 and over.
No. This is a general educational estimate, not medical advice, diagnosis or treatment. Speak to a qualified healthcare professional about what any measurement means for you.
No. The calculation runs entirely in your browser and nothing is stored.

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Private by design

This runs entirely in your browser

No file or text you enter here is uploaded. Encoding and decoding happen on your device using native browser APIs — close the tab and nothing remains on a server.

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