The waist-to-hip ratio (WHR) compares two body circumferences. The calculation is a simple division: waist measurement divided by hip measurement, with both measurements expressed in the same unit.
The calculator below only returns this numerical report. It does not classify the silhouette, make any diagnosis, or suggest any medical course of action. Its code performs the calculation in your browser and contains no mechanism that sends or saves the two entered values.
Waist-to-hip ratio calculator
Positive value between 20 and 300.
Positive value between 20 and 300.
The calculator code does not send or save the entered values.
Waist-to-hip ratio formula
The formula is: waist-to-hip ratio = waist circumference ÷ hip circumference. For example, if both measurements are entered in centimeters, the unit is canceled out during division. Therefore, the result has no units. Using different units will distort the calculation: do not mix centimeters and inches.
The calculator rounds the display to three decimal places to make the result readable. This rounding does not correct for a misplaced measurement, a tilted tape measure, or a different posture. The accuracy of the ratio depends primarily on the accuracy of the two measurements.
WHO protocol for measuring waist circumference
The WHO STEPS protocol of the World Health Organization requires locating the last palpable rib and the top of the iliac crest. The tape measure is placed midway between these two landmarks, at the same level on both sides. It should remain horizontal in front and behind, as parallel to the ground as possible.
- Stand with your feet together and your weight distributed on both feet;
- Leave your arms relaxed at your sides;
- breathe normally for a few cycles;
- Take the reading at the end of a normal exhalation, without pulling in your stomach;
- Keep the tape measure adjusted without compressing the skin;
- Read the measurement to the nearest tenth of a centimeter.
The WHO measurement point is not chosen because it appears to be the thinnest. It is based on anatomical landmarks. To compare two measurements taken on different dates, use the same protocol and conditions as similar as possible.
WHO protocol for measuring hip circumference
For the hips, the WHO STEPS protocol places the measuring tape around the maximum circumference of the buttocks. The person remains standing with feet together, weight evenly distributed, and arms relaxed. The tape should be horizontal all around the body, snug but not tight.
Looking at the tape measure from the side and in a mirror can help identify any tilt. Another person can help level the tape, provided they use the same reference points and maintain privacy. The reading is taken at the tape level, to the nearest tenth of a centimeter, according to the STEPS guide.
How to use the calculator
- Measure the waist and then the hips according to the protocol described;
- Enter both values in centimeters;
- select "Calculate waist-to-hip ratio";
- Read the displayed number, without automatically assigning it a category;
- Use "Clear" to delete the values and the result.
The controls only accept positive numbers within a wide technical range. This control prevents empty fields, negative values, and impossible division. It does not validate the quality of the measurement and does not constitute a medical assessment.
The result does not allow us to conclude
The waist-to-hip ratio is an anthropometric indicator. This page does not associate it with any thresholds, zones, or labels. Publications that study this ratio use specific populations, methods, and objectives. A single number does not summarize a person's health status or describe a complete anatomy.
The waist-to-hip ratio is not a substitute for a clinical examination, medical history, or other measurements taken by a professional. It cannot determine the appropriateness of an intervention. If a team requests this measurement, follow their protocol and ask them how they use it in your specific case.
Common sources of error
- Do not place the tape measure at the level of the navel without checking the required anatomical landmarks.
- Do not let the ribbon ride up the back or down one side.
- Do not tighten the tape so much that it marks or compresses the skin.
- Do not measure during a deep breath or while contracting the abdomen.
- For the hips, do not choose the widest point of the bony pelvis instead of the maximum circumference of the buttocks.
- Do not use a tape measure that is loose, twisted, or has illegible markings.
A small difference in position can alter the report. If you need to document a change, note the date, the protocol, and the measurement conditions. A single measurement taken under different conditions should not be presented as a definite change.
Confidentiality and local operation
In this component, the calculation is performed by the handlers integrated into the buttons and fields. This code does not call any services with the two entered values and does not use local browser storage, session storage, or cookies for them. This description pertains to the calculator code, not to any other functions or services that may be loaded by the WordPress page. The "Clear" button clears the fields, removes the message, and resets the result to its initial state.
To understand the general steps involved in surgery, consult the surgical pathway in France . The pre-operative preparation checklist helps organize the information provided by the hospital. Our guide on lipedema explains, in a different context, why symptoms and a professional examination are not limited to a single body measurement.
FAQ on measurements and calculations
Should the measurements be entered in centimeters?
Yes, the fields are labeled in centimeters. The formula would work with another unit if it were the same for both measurements, but this calculator expects centimeters.
Why does the result have three decimal places?
This is a consistent display choice. It does not mean that the body measurement has the same accuracy. The tape measure's placement and posture remain the main sources of variation.
Does the calculator save my measurements?
No. The calculator code keeps the calculation on the open page and does not use any saving or sending functions for the two entered values.
Verified sources
- World Health Organization, report on waist circumference and waist-to-hip ratio.
- World Health Organization, WHO STEPS manual, protocol for physical measures.
Editorial Notice: This neutral calculator and general information content were prepared from the listed sources and editorially verified on July 16, 2026. No specific medical review is claimed. The result is a numerical report without interpretation and does not replace a professional assessment.
