What is estimated
The ratio between waist and hip circumference using measurements in the same unit.
Waist-to-Hip Ratio Calculator
Waist-to-hip ratio
Enter your values, then calculate to see a verified result.
Reference range
How this result is calculated
A clear calculation path based on your inputs.
Inputs usedReview the information used for this result.
Full calculation and sourcesReview the equation, normalized inputs, assumptions, and version.
Versioned calculationFormula v1.0.0
Method
Both measurements are normalized before division; the result itself has no unit.
Important boundary
Measurement site and population context matter. The displayed reference threshold is a screening context, not a diagnosis.
Measure waistUse a level tape and one documented anatomical site.
82 cmMeasure hipsMeasure the widest buttock circumference in the same unit.
100 cmDivide waist by hipsKeep full precision before display rounding.
82 / 100 = 0.820Interpretation
is the dimensionless waist-to-hip ratio.
Compare only with a reference that matches the measurement protocol and population.
Trend checks require the same tape position and conditions each time.
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Related calculators and resources
Method and test recordFormula v1.0.0
- Recorded scope
- health-body-composition
- Publisher
- CalculatorGeek
- Recorded review date
- 2026-10-04
- Next source review
- 2027-10-04
- Definition fixtures
- 4 configured scenarios
- Published examples
- 4 shown below
Recorded method
Independently divide normalized waist by hip circumference, test unit cancellation, and verify both sex-specific reference boundaries without display-rounding leakage.
These records describe the published model and reference tests. A test-case count is not a certification of every possible input or an independent specialist review. Editorial policy
Known limitations
- WHO notes variation by sex, age, ethnicity, population, and measurement protocol.
- A threshold cannot diagnose disease or describe total body fat.
- Waist circumference alone may be simpler and may provide different information.
- Pregnancy and conditions affecting abdominal size require different interpretation.
Method sources
- WHO: Waist circumference and waist-hip ratio expert consultation
- CDC NHANES Anthropometry Procedures Manual
Latest model update
2026-10-04 - Initial CalculatorGeek shared-system implementation with source-backed method, fixtures, content, and result journey.
Reference inputs and expected results
Up to 12 examples from the configured definition fixtures are shown. Expected values use the stated output units; invalid inputs are intended to be rejected.
| Case | Inputs | Expected result |
|---|---|---|
| male below reference | Equation sex term: male; Waist circumference: 82 cm; Hip circumference: 100 cm | Waist-to-hip ratio: 0.82; Sex-specific reference threshold: 0.9; classification: below-reference |
| imperial parity | Equation sex term: male; Waist circumference: 32.283465 in; Hip circumference: 39.370079 in | Waist-to-hip ratio: 0.82 (allowed numeric tolerance: 0.0001) |
| female boundary | Equation sex term: female; Waist circumference: 85 cm; Hip circumference: 100 cm | Waist-to-hip ratio: 0.85; classification: at-or-above-reference |
| invalid hip | Equation sex term: female; Waist circumference: 70 cm; Hip circumference: 20 cm | Reject invalid input: hip |
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On this page
What the Waist-to-Hip Ratio Calculator answers
Divide waist circumference by hip circumference and compare the unrounded ratio with the cited sex-specific screening reference.
The calculator keeps the measurement protocol and limitations visible instead of labeling one ratio as a universal health verdict.
Start with the Health calculators hub when you need to choose a different body-measurement method.
How to use the Waist-to-Hip Ratio Calculator
- Select the sex-specific reference context.
- Measure waist and hips with the same unit.
- Enter both circumferences without rounding early.
- Read the ratio, threshold, and measurement limitations together.
For a complementary body-measurement workflow, use the Lean Body Mass Calculator. Compare a regression-based estimate of non-fat mass.
Formula, variables and method
WHR = waist circumference / hip circumference. Because the units cancel, centimeters and inches produce the same ratio when both measurements use the same unit.
The contextual reference shown is 0.90 for the male coefficient set and 0.85 for the female coefficient set, as summarized in the cited WHO report. WHO also describes important population and protocol limits.
To compare this method with a different input model, open the Body Roundness Index Calculator. Apply the ellipse-based waist-height index.
Worked examples and boundary checks
82 cm waist and 100 cm hips
82 / 100 = 0.820. The same measurements entered as 32.28 in and 39.37 in produce the same ratio.
Reference-boundary check
For the female reference context, 85 cm / 100 cm = 0.850, so the unrounded result is at the cited threshold.
How to interpret the result
A larger ratio indicates more waist circumference relative to hip circumference. It does not identify the cause or quantify visceral fat directly.
- WHO notes variation by sex, age, ethnicity, population, and measurement protocol.
- A threshold cannot diagnose disease or describe total body fat.
- Waist circumference alone may be simpler and may provide different information.
- Pregnancy and conditions affecting abdominal size require different interpretation.
For another relevant cross-check, continue with the Relative Fat Mass Calculator. Estimate body-fat percentage from height and waist.
Frequently asked questions
Where should I measure my waist?
Use one documented protocol and repeat it consistently. Different protocols can use different landmarks and should not be mixed.
Do centimeters and inches change the ratio?
No, provided both circumferences use the same unit.
Is 0.90 or 0.85 a diagnosis?
No. These are contextual screening references, not diagnostic cutoffs for an individual.
Why can my ratio change without weight change?
Waist, hip, posture, tape position, breathing, and measurement error can change the ratio independently of scale weight.
Should I use waist-to-height ratio instead?
It answers a related but different question and avoids the additional hip measurement. Use the method appropriate to your source or protocol.
Primary sources and evidence limits
- WHO: Waist circumference and waist-hip ratio expert consultation
- CDC NHANES Anthropometry Procedures Manual
Sources were checked 2026-10-04. They establish the published method or measurement context; they do not turn an anthropometric estimate into a diagnosis, direct body-composition measurement, or treatment recommendation.