Waist to Hip Ratio Calculator

Context band {{ bandBadge }} WHO screen {{ screenBadge }} Tape range {{ uncertaintyBadge }}

Reference sex:

Choose the reference that matches the screening guidance you are using.

Waist circumference:

Changing the unit converts the displayed value without changing the physical measurement.

Hip circumference:

Waist and hip may use different units; the model normalizes both to centimetres.

Display precision:

Choose 0 to 4; the neutral default is 2.

decimals

Waist correction:

Use negative values to reduce an over-read measurement.

Hip correction:

The adjusted hip must remain positive.

Tape uncertainty:

Zero is neutral; use up to 3 cm when repeated readings vary.

± cm

Custom context bands:

Leave off to use the repo-authored female or male context bands.

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Ratio review

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Calculation method:

WHR = adjusted waist ÷ adjusted hip

The chart renderer is unavailable. The same thresholds remain available in the review and ledger.

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Two people can have the same waist circumference and different waist-to-hip ratios because hip circumference changes the comparison. The ratio describes body shape by dividing the waist measurement by the hip measurement. It is commonly used as a screening clue for abdominal fat distribution, alongside measures such as waist circumference and body mass index (BMI).

The tape positions matter as much as the arithmetic. Waist and hip must be measured horizontally with a snug tape that does not compress the body. The waist reading should follow one consistent anatomical landmark and a normal exhale; the hip reading should pass around the widest buttock or hip circumference. A different landmark, posture, tape tension, clothing layer, or breathing phase can move a result near a cutoff.

Waist circumference: The numerator. A larger waist raises the ratio when hip circumference stays fixed.
Hip circumference: The denominator. A larger hip measurement lowers the ratio when waist circumference stays fixed.
Waist-to-hip ratio: A unitless comparison, so centimetres and inches give the same answer when both describe the same physical measurements.
Screening cutoff: A population-level threshold that flags a result for context; it is not a diagnosis.

The World Health Organization report commonly cited for adult screening lists waist-to-hip ratios at or above 0.85 for women and 0.90 for men as abdominal-obesity cutoffs. Those broad thresholds do not account for every age, ethnicity, pregnancy status, disability, medical condition, or measurement protocol. They also do not turn the ratio into a direct measurement of visceral fat.

Related measures answer different questions. Waist circumference keeps the focus on abdominal size without dividing by hip size. BMI compares weight with height and says nothing about where weight is carried. WHR can add distribution context, but a lower ratio may reflect a smaller waist, a larger hip circumference, or both. That is why changes should be interpreted with the original measurements, not from the ratio alone.

Repeatability is especially important near a boundary. Taking two readings under the same conditions and recording the landmark is more useful than adding display decimals to one uncertain measurement. A narrow difference around 0.85 or 0.90 may disappear or reverse when the tape is placed again.

Waist-to-hip ratio is an informational screen. It cannot diagnose disease, estimate body-fat percentage, or replace clinical history, laboratory results, professional assessment, and other relevant body measurements.

How to Use This Tool:

Measure both circumferences under the same conditions, then choose the screening reference that matches the guidance you are using.

Select Reference sex. This sets the WHO screen and the default display context bands.
Enter Waist circumference after a normal exhale with the tape level and snug at the chosen waist landmark.
Enter Hip circumference around the widest buttock or hip circumference without compressing clothing or skin. Waist and hip may use different units; both are normalized to centimetres.
Use Waist correction or Hip correction only for a known offset. Zero leaves the entered measurement unchanged.
Add Tape uncertainty when repeat readings vary. The range tests the same plus-or-minus centimetre allowance in the combinations that produce the lowest and highest ratio.
Use Custom context bands only when a relevant protocol supplies its own lower and upper display boundaries. Custom bands do not change the WHO screen.
Review the current ratio, WHO status, context band, and tape range. Repeat the measurements when the uncertainty interval crosses a context or WHO boundary.

Interpreting Results:

Read the unrounded ratio against the separate WHO screen. Female reference results are at or above the screen when WHR ≥ 0.85; male reference results are at or above it when WHR ≥ 0.90. Display precision changes only the printed number, not classification.

Lower context, Middle context, and Upper context are display bands maintained by this site. They are not an official WHO three-band classification. For the male default, the WHO screen begins at 0.90 while Upper context begins at 1.00, so a Middle context result can already be at or above the WHO screen.

The tape range is the best confidence check near a cutoff. If its minimum and maximum fall on different sides of a boundary, repeat the measurements before drawing a conclusion. A stable interval means only that the entered uncertainty did not change this classification, not that the result is clinically certain.

Technical Details:

Both circumferences are converted to centimetres, then any stated corrections are added. Because the numerator and denominator use the same unit, the quotient is unitless. Threshold decisions use the full-precision quotient.

Formula Core:

The central ratio is adjusted waist divided by adjusted hip. Tape uncertainty expands it by pairing the smallest plausible waist with the largest plausible hip, then the largest waist with the smallest hip.

WHR = \frac{W_{a}}{H_{a}}

W_{a} = W + C_{w} H_{a} = H + C_{h}

{WHR}_{min} = \frac{W_{a} - e}{H_{a} + e} {WHR}_{max} = \frac{W_{a} + e}{H_{a} - e}

Waist-to-hip ratio formula symbols
Symbol	Meaning	Unit
`W`, `H`	Normalized waist and hip circumference	cm
`Cw`, `Ch`	Optional waist and hip corrections	cm
`Wa`, `Ha`	Adjusted waist and hip circumference	cm
`e`	Plus-or-minus tape uncertainty	cm
`WHR`	Waist-to-hip ratio	ratio

Inches are multiplied by exactly 2.54. Adjusted waist and hip must each resolve to 30 through 250 cm. Tape uncertainty may be 0 through 3 cm and must leave the low hip denominator above zero. Corrections may range from −20 to 20 cm.

Rule Core:

Default waist-to-hip ratio context and WHO screen boundaries
Reference	Context condition	WHO screen
Female	Lower: WHR < 0.80	At or above when WHR ≥ 0.85
	Middle: 0.80 ≤ WHR < 0.85
	Upper: WHR ≥ 0.85
Male	Lower: WHR < 0.90	At or above when WHR ≥ 0.90
	Middle: 0.90 ≤ WHR < 1.00
	Upper: WHR ≥ 1.00

Custom lower and upper boundaries replace only the three context conditions; the upper value must be greater than the lower. The WHO screen always remains 0.85 for the female reference or 0.90 for the male reference.

At a fixed adjusted hip circumference, each threshold can also be expressed as a waist boundary: hip × cutoff. Reported waist gaps show adjusted waist minus that boundary. These derived centimetre values help explain how close the current measurements are to a ratio cutoff.

Limitations and Accuracy Notes:

Waist-to-hip ratio is a population screening measure, not a diagnosis or treatment recommendation. Measurement protocol and personal context can materially change its meaning.

Age, ethnicity, pregnancy, disability, body composition, medical history, and the chosen measurement landmark can affect interpretation.
The display-only context bands used here should not be presented as WHO categories.
Corrections and custom bands are appropriate only when they come from a documented protocol.
Use repeat readings and professional guidance when the result is concerning or close to a consequential cutoff.

Worked Examples:

A female-reference result at the screen

A waist of 85 cm and hips of 100 cm produce a ratio of 0.85, exactly at the female WHO screen and the start of Upper context. With ±0.5 cm tape uncertainty, the possible ratio runs from about 0.8408 to 0.8593. Because that interval crosses 0.85, both the context band and WHO status can change; repeat the measurements before treating the boundary result as stable.

References:

Waist circumference and waist-hip ratio: report of a WHO expert consultation, World Health Organization, 16 May 2011.
National Health and Nutrition Examination Survey: 2021 Anthropometry Procedures Manual, CDC/National Center for Health Statistics, May 2021.