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Health and fitness formula

How to calculate waist-to-height ratio

Waist-to-height ratio compares waist size with height as a simple body-size estimate.

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Direct answer
Formula
WHtR = waist circumference / height

Use the table below to match each symbol with the right input. Keep units consistent before you start.

Waist-to-height ratio formula
Start here when you only need the equation and variable names.
Formula
WHtR = waist circumference / height

Waist-to-height ratio compares waist size with height as a simple body-size estimate.

Variable meanings
Check each symbol, meaning, and unit before you calculate.
SymbolNameDescriptionUnit
WHtRWaist-to-height ratioWaist size divided by height.Depends on inputs
waist circumferenceWaist circumferenceMeasured waist size.cm or in
heightHeightMeasured height.cm or in
When to use this formula
Check that your situation matches the formula before you trust the result.
  • Treat it as a screening estimate alongside other measurements, not as a diagnosis.
Step-by-step method
Follow these steps when you are solving it by hand.
  1. 1Measure waist and height in the same unit.
  2. 2Divide waist by height.
  3. 3Round to two decimals if needed.
  4. 4Interpret the result with age, sex, and health context in mind.
Examples
These sample numbers show the order of operations and units.
Metric ratio
waist
80 cm
height
175 cm
  1. 1.WHtR = 80 / 175
  2. 2.WHtR = 0.46
Result
The waist-to-height ratio is 0.46.
Imperial ratio
waist
34 in
height
68 in
  1. 1.WHtR = 34 / 68
  2. 2.WHtR = 0.50
Result
The waist-to-height ratio is 0.50.
Mistakes to avoid
Small input or unit errors can change the answer a lot.
  • Treating the waist-to-height ratio result as a diagnosis or a personal training plan.
  • Mixing inches, centimeters, pounds, and kilograms without converting first.
  • Using stale measurements after weight, activity, or training level changes.
  • Ignoring the method assumptions behind the estimate.
Open the Waist to Height Ratio Calculator
Open the calculator for the answer without rewriting the formula.

Enter your values in the related calculator, then compare the output with the hand method above.

Open Waist to Height Ratio Calculator
FAQs
Short answers for common formula questions.
Is the Waist-to-height ratio formula a medical test?

No. It gives an estimate from a few inputs. Treat it as a planning or screening number, and ask a qualified clinician about symptoms, medication, pregnancy, eating disorders, or medical conditions.

Why can my Waist-to-height ratio result differ from a wearable or lab test?

Different methods use different assumptions. Small measurement changes, activity estimates, and rounding can move the result.

Can I use the Waist-to-Height Ratio Calculator instead?

Yes. The Waist-to-Height Ratio Calculator handles the arithmetic and helps catch unit conversion mistakes.