Waist-to-Hip Ratio Calculator turns two circumference measurements into a simple waist-to-hip ratio so you can describe body-fat distribution with more context. Measure consistently, use the same unit for waist and hips, and treat the result as one screening-style measurement rather than a diagnosis.
Use the same unit for both measurements. The optional cut-off comparison is a population reference from a WHO report, not an individual diagnosis.
Calculated as 80 cm ÷ 100 cm.
Related: waist-to-height ratio · body measurement tools.
The Waist-to-Hip Ratio Calculator compares the circumference of your waist with the circumference of your hips. The result is unitless: a waist of 80 cm and hips of 100 cm gives the same 0.80 ratio as 31.5 inches and 39.4 inches.
Waist-to-hip ratio, often shortened to WHR, is a simple anthropometric measure of body-fat distribution. A higher value generally means the waist is larger relative to the hips. Research and public-health guidance have used WHR as one marker associated with cardiometabolic risk, but the number does not directly measure visceral fat, blood pressure, blood glucose, cholesterol, fitness, or overall health.
That distinction matters. The Waist-to-Hip Ratio Calculator can summarize two tape-measure readings, but it cannot explain why the ratio is high or low. Body shape, muscle mass around the hips, age, sex, ethnicity, pregnancy, recent meals, bloating, measurement site, and tape tension can all affect the context. Use it alongside other information rather than treating a single threshold as a verdict.
If your goal is broader body-composition context, compare this result with the Body Fat Calculator and the Body Composition Guide. If you specifically want waist size relative to height, use the Waist-to-Height Ratio Calculator instead.
The arithmetic is simple. Repeating the same measurement method is the part that protects comparability.
Stand relaxed and measure at a defined waist site. For a WHO-style protocol, use the midpoint between the lower margin of the last palpable rib and the top of the iliac crest. Keep the tape horizontal and avoid compressing the skin.
Measure around the widest portion of the buttocks with the tape parallel to the floor. Keep your feet close together and distribute your weight evenly. Record the number using the same unit as your waist measurement.
Enter the two numbers in the Waist-to-Hip Ratio Calculator or divide waist circumference by hip circumference. For 84 cm at the waist and 100 cm at the hips, 84 ÷ 100 = 0.84.
If two readings differ noticeably, measure again rather than averaging obviously inconsistent technique. For progress tracking, use the same tape, anatomical landmarks, posture, and timing when practical.
Measurement protocol is not a cosmetic detail. The World Health Organization expert consultation describes a STEPS-style waist measurement at the midpoint between the lower margin of the last palpable rib and the top of the iliac crest. It describes hip circumference around the widest portion of the buttocks, with the tape parallel to the floor.
The same report recommends a relaxed standing posture, feet close together, arms at the sides, body weight evenly distributed, and measurements near the end of a normal expiration. It also notes that waist protocols differ across organizations and studies. That is one reason trend tracking is most useful when you repeat the same method instead of switching landmarks.
For a practical body-measurement workflow, visit CalcFFMI’s How to Measure Body Fat at Home guide. For the source protocol, read the WHO waist circumference and waist–hip ratio report ↗.
Return to calculator ↗The Waist-to-Hip Ratio Calculator uses one equation: waist circumference divided by hip circumference. No age, weight, height, or body-fat estimate is required for the arithmetic itself.
For metric values, 90 cm ÷ 100 cm = 0.90. For imperial values, 35.43 in ÷ 39.37 in also equals approximately 0.90. The important rule is not to mix units. If your waist is entered in centimetres and your hips in inches, the result is meaningless unless one value is converted first.
Rounding can change a borderline comparison. If your measurements produce 0.896, displaying only one decimal would hide useful detail. This page shows two decimals for the main ratio and keeps the underlying calculation at full browser precision. Still, extra decimals do not make a tape measurement more accurate.
The calculator also shows waist circumference as a percentage of hip circumference. A ratio of 0.84 means the waist measurement is 84% of the hip measurement. That percentage is simply another way to express the same relationship; it is not a separate health score.
Reference cut-offs are context, not diagnoses. Population, measurement method, and guideline choice matter.
The WHO expert report summarizes older WHO cut-off points of waist-to-hip ratio at or above 0.90 for men and at or above 0.85 for women as a marker of substantially increased risk of metabolic complications. The same report also emphasizes variation by sex, age, and ethnicity and discusses evidence suggesting that appropriate cut-offs may differ between populations.
| Reference group | WHO report cut-off | How to use it here |
|---|---|---|
| Men | WHR ≥ 0.90 | Population-level reference for context, not a diagnosis. |
| Women | WHR ≥ 0.85 | Population-level reference for context, not a diagnosis. |
Do not assume that being below a cut-off means “no risk,” or that being above it proves a disease. Cardiovascular and metabolic risk depends on many factors that the Waist-to-Hip Ratio Calculator does not measure. If a result concerns you—especially alongside high blood pressure, abnormal glucose or lipid results, symptoms, or a strong family history—discuss the bigger picture with a qualified clinician.
Modern research continues to study central adiposity measures. A 2024 systematic review and meta-analysis reported an association between elevated waist-to-hip ratio and myocardial infarction risk across observational studies, while also showing substantial heterogeneity. That supports using WHR as a risk marker, not as a stand-alone prediction for an individual. See the PubMed record for the meta-analysis ↗.
For another simple central-adiposity measure, compare your result with the Waist-to-Height Ratio Calculator. For total weight relative to height, the BMI Calculator answers a different question and should not be treated as interchangeable with WHR.
These examples demonstrate the math. They are not personalized medical assessments.
The waist is 80% of the hip circumference. The same ratio would result after converting both measurements to inches.
The Waist-to-Hip Ratio Calculator reports 0.92. Interpretation should use an appropriate reference and the rest of the person’s health context.
Because both values use inches, the units cancel. Metric and imperial entries give the same ratio when they describe the same measurements.
No single body measurement captures every aspect of body composition or cardiometabolic health.
The Waist-to-Hip Ratio Calculator describes the relationship between two circumferences. It reflects body shape and central size relative to hip size, but it does not directly measure fat mass or lean mass.
Waist-to-height ratio compares waist circumference with height rather than hips. Use the Waist-to-Height Ratio Calculator when you want a stature-adjusted waist measure.
A Body Fat Calculator estimates body-fat percentage using a chosen method, while the FFMI Calculator relates estimated fat-free mass to height. These are different calculations with different assumptions.
Most errors come from the measurements, not the division. A perfectly coded Waist-to-Hip Ratio Calculator cannot correct a tape placed at a different anatomical site each time.
If your main goal is progress tracking, save the raw waist and hip measurements as well as the ratio. That makes it easier to see whether a change came from the waist, hips, or both. The Body Measurements Change Calculator can help compare circumference changes over time.
The Waist-to-Hip Ratio Calculator does not measure internal organs, visceral fat volume, muscle mass, bone density, blood pressure, glucose, cholesterol, inflammation, fitness, or disease. It also does not account for pregnancy, recent surgery, edema, medical conditions that alter body shape, or unusual muscular development around the trunk and hips.
Because the result depends on two circumferences, measurement error can enter through either value. A small waist error or hip error can shift the ratio enough to change a rounded category near a cut-off. For that reason, repeated measurements and a consistent protocol are more defensible than chasing a single “perfect” reading.
The WHO consultation specifically discusses variation by sex, age, and ethnicity and notes that evidence for cut-off points differs between populations. The Waist-to-Hip Ratio Calculator therefore keeps the math separate from optional reference comparisons. It gives you the ratio first and leaves the broader interpretation where it belongs: in context.
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For repeat tracking, write down the date, measurement site, unit, and any condition that could affect the tape reading. Measuring at a similar time of day can reduce avoidable variation, but there is no need to create a rigid ritual. The useful goal is comparability: enough consistency that a real trend is easier to distinguish from changes caused by posture, breathing, clothing, or tape placement.
Short answers for measurement, formula, units, cut-offs, and progress tracking.
A Waist-to-Hip Ratio Calculator divides waist circumference by hip circumference. The result describes waist size relative to hip size. It is unitless when both measurements use the same unit.
Divide waist circumference by hip circumference. For example, 86 cm ÷ 102 cm = 0.843, usually displayed as 0.84. Use the same measurement unit for both numbers.
Not if you are following the WHO STEPS-style protocol cited on this page. That approach measures the waist at the midpoint between the lower margin of the last palpable rib and the top of the iliac crest. Other protocols use different landmarks, so consistency matters.
For the protocol summarized by WHO, measure around the widest portion of the buttocks with the tape parallel to the floor. Stand relaxed with weight evenly distributed.
Yes. The Waist-to-Hip Ratio Calculator works in inches or centimetres because the same units cancel during division. Do not mix inches for one measurement with centimetres for the other.
The WHO report summarizes cut-offs of at least 0.90 for men and at least 0.85 for women in an older WHO framework for substantially increased metabolic-complication risk. Population differences and individual health context matter, so use these as references rather than diagnoses.
They answer different questions. WHR describes waist size relative to hips, while BMI relates total weight to height squared. Neither directly measures disease or body-fat distribution with clinical imaging. Using multiple relevant measures can provide more context than treating either as a complete health score.
Use the Waist-to-Hip Ratio Calculator often enough to match your tracking goal, but not so often that normal measurement noise becomes the focus. For body-composition progress, consistent technique and longer-term trends are generally more useful than reacting to day-to-day changes.
No. The adult reference cut-offs summarized on this page should not be applied to children, and pregnancy changes waist circumference in a way that makes ordinary adult waist-to-hip interpretation unsuitable. Use age- and situation-appropriate clinical guidance instead.
The Waist-to-Hip Ratio Calculator gives you a transparent ratio from two measurements. Keep the raw numbers, repeat the same technique, and combine the result with appropriate health and body-composition context.
Educational information only. This page does not diagnose disease or replace individualized medical advice.