Waist-to-Hip Ratio Calculator
By Rick Campbell · Updated · Sourced to primary literature · Not medical advice
Waist-to-hip ratio captures fat distribution: whether weight concentrates at your middle (the higher-risk 'apple' pattern) or your hips ('pear'). The WHO flags substantially increased cardiometabolic risk at 0.90 or above for men and 0.85 or above for women.
This page also checks your waist circumference alone against the WHO's separate cut-offs, because a large waist is a risk signal even when generous hips keep the ratio looking polite.
And because you have already taken a waist and a hip measurement, adding a height and a weight unlocks the full multi-measure assessment used by the 2025 obesity framework: BMI plus a direct measure of fat distribution, the same signature panel our BMI page runs. If the ratio comes out implausible, the page also tells you which measurement is most likely at fault rather than reporting a number nobody should act on.
In brief
- Waist-to-hip ratio is waist circumference divided by hip circumference, both taken in the same unit; the WHO flags substantially increased risk at 0.90 or more in men and 0.85 or more in women.
- INTERHEART, a case-control study of 27,098 people across 52 countries, found waist-to-hip ratio strongly and gradedly associated with heart attack while BMI was only weakly related: the population-attributable risk was 24.3% for the top two ratio quintiles against 7.7% for BMI.
- The hip is the least reproducible landmark on the body: measuring at the bony iliac crest instead of the widest part of the buttocks reads small and inflates the ratio, which is the single most common error on this calculator.
- The ratio can improve for the wrong reason (gaining fat on the hips lowers it as effectively as losing fat from the waist), so read it alongside waist circumference and waist-to-height rather than on its own.
- Where fat sits is substantially genetic and shifts with age and menopause, so the ratio describes a pattern you only partly control; what you do control is how much fat there is in total.
Calculator
What you'll see here
Your waist-to-hip ratio read against the WHO threshold for your sex, marked on a scale; the full threshold table with your row highlighted; your waist circumference against the separate WHO action levels; a sanity check on the hip measurement if the ratio comes out implausible; and, if you add a height and weight, the complete multi-measure obesity assessment, since this page already collects both waist and hip.
WHO thresholds for waist-to-hip ratio and waist circumference
| Sex | Waist-to-hip ratio, substantially increased risk | Waist, increased risk | Waist, substantially increased risk |
|---|---|---|---|
| Men | 0.90 or more | 94 cm or more | 102 cm or more |
| Women | 0.85 or more | 80 cm or more | 88 cm or more |
The ratio thresholds (0.90 for men and 0.85 for women) and the waist action levels at 94 and 102 cm for men and 80 and 88 cm for women are the figures reproduced in the report of the WHO expert consultation on waist circumference and waist–hip ratio (Geneva, 8–11 December 2008). The two screens carry independent information, which is why both are shown: the ratio describes where fat sits, the waist describes how much is there.
There is no lower bound to aim for. These are screening lines for triage, not a score to optimise, and crossing one is a reason to look further, not a diagnosis.
Apple, pear, and why it matters
Fat stored viscerally, around the abdominal organs, is metabolically active in ways subcutaneous hip and thigh fat is not: it feeds free fatty acids to the liver, promotes insulin resistance and low-grade inflammation. Landmark research including the INTERHEART study found waist-to-hip ratio a stronger heart-attack predictor than BMI across 52 countries. Distribution is substantially genetic and shifts with age and menopause, but the response is the same as for any excess adiposity signal: activity, diet quality and, if the numbers warrant it, a proper clinical assessment.
The apple-and-pear shorthand is crude but it points at something real. Two people of identical weight and height, one carrying their fat at the waist and one at the hips, do not face the same risk. The ratio is an attempt to put a number on which of those two people you are, not on how much fat you have, which is what the scale and BMI are for.
The formula
Waist-to-hip ratio = waist circumference ÷ hip circumference, with both measurements in the same unit. As with waist-to-height, the unit cancels: 86 cm ÷ 100 cm and 33.9 in ÷ 39.4 in both give 0.86. Report it to two decimal places; the hip measurement is not reproducible enough to justify a third.
There is no age term, no weight term and no adjustment factor. That austerity is both the appeal and the limit: the ratio knows nothing about how big you are, only about the relationship between two circumferences, so a very small person and a very large one with the same shape return the same number.
- Both circumferences in centimetres, or both in inches. Never one of each.
- The waist figure should be the smaller of the two for almost every adult; if it is not, re-check the hip landmark.
- A one-centimetre error at the hip moves the ratio by roughly 0.01 for an average adult, the same size as the gap between many people and their threshold.
How to measure waist and hips correctly
The WHO protocol is specific. The waist is measured at the midpoint between the lower margin of the last palpable rib and the top of the iliac crest, standing, with the tape fitted snugly against the skin without compressing the soft tissue underneath, and read at the end of a normal expiration. The hip is measured around the widest portion of the buttocks, tape level with the floor, feet together and weight even on both legs.
The iliac-crest error is the big one and it is worth spelling out. The iliac crest is the ridge of pelvic bone you can feel with your thumbs when you put your hands on your hips, and because it is the thing people instinctively find when told to measure their hips, an enormous number of hip measurements are taken there. It sits several centimetres above the widest part of the buttocks and reads several centimetres smaller, which inflates the ratio and can easily push a correct 0.84 up to a wrong 0.90. If your result crosses a threshold by a hair, re-take the hip measurement before you do anything else.
Everything else is the usual discipline: thin clothing or bare skin, two or three passes averaged, the same time of day each time, and the tape checked in a mirror to make sure it is horizontal all the way round. Different people measuring the same hips routinely differ by more than a centimetre, so a ratio that changed by 0.01 between two measurements has told you nothing at all.
- Waist: midway between the lowest rib and the top of the hip bone, at the end of a normal breath out.
- Hip: the widest point of the buttocks, which is lower than the bony points of the pelvis.
- Both: tape level, snug, not compressing, feet together, and the same protocol every single time.
The WHO thresholds and the evidence behind them
The report of the WHO expert consultation on waist circumference and waist–hip ratio, held in Geneva in December 2008, reproduces the cut-off points widely used today: a waist-to-hip ratio of 0.90 or more in men and 0.85 or more in women denotes substantially increased risk of metabolic complications, alongside waist circumference action levels of 94 and 102 cm for men and 80 and 88 cm for women.
The strongest single piece of evidence for the ratio over BMI came from INTERHEART, published in the Lancet in 2005. Yusuf and colleagues compared 12,461 people who had had a first heart attack with 14,637 matched controls across 52 countries. Waist-to-hip ratio showed a graded, highly significant association with myocardial infarction (an odds ratio of 1.75 for the top quintile against the lowest) while BMI was only weakly related once the ratio was accounted for. The population-attributable risk of heart attack was 24.3% for the top two quintiles of waist-to-hip ratio, against 7.7% for the top two quintiles of BMI. The authors' conclusion was blunt: redefining obesity by waist-to-hip ratio rather than BMI substantially increases the share of heart attacks attributable to obesity in most ethnic groups.
That result is about populations rather than individuals, which is the usual caveat on any epidemiological threshold. A ratio of 0.91 does not mean a man will have a heart attack, and 0.89 does not protect him. What the evidence supports is using the ratio as a screen that catches people BMI misses, and then investigating properly.
Why fat distribution is substantially genetic, and shifts with age and menopause
Where your body puts fat is not mainly a matter of willpower. The GIANT consortium's genome-wide analysis of up to 224,459 people, published in Nature in 2015, identified 49 genetic loci associated with waist-to-hip ratio after adjusting for BMI (that is, loci associated with shape independently of size). The genes implicated cluster in adipose tissue biology: adipogenesis, angiogenesis, transcriptional regulation and insulin resistance. Twenty of those 49 loci showed significant sexual dimorphism, and nineteen of the twenty had a stronger effect in women.
Age and hormonal status move the pattern too. Longitudinal data from the SWAN cohort showed visceral fat rising sharply through the menopause transition itself (an annualised increase of about 6% during the transition, decelerating afterwards) while gynoid fat on the hips and thighs began to fall. That is a redistribution, not simply a gain: many women see their waist-to-hip ratio climb through their late forties and fifties without any change in what they eat or how they train.
None of that makes the number useless. It makes it a description of a pattern you partly inherited and partly aged into, laid over an amount of fat you do influence. The ratio moves when total adiposity moves; it just starts from a position you did not choose.
Waist-to-hip, waist-to-height or waist alone: which to use when
Use waist circumference alone when you want the number a clinician will recognise without conversion, or when you are tracking your own change month to month. It is the single most reproducible of the three, it needs one measurement, and the IAS and ICCR consensus statement of 2020 argued it should be recorded as routinely as blood pressure precisely because it adds information to BMI that BMI cannot supply.
Use waist-to-height when you want one threshold that works across sexes, ethnicities and most heights, and when you want an actionable target: half your height is a number you can put a tape against. It is the measure NICE adopted in NG246 for adults with a BMI under 35.
Use waist-to-hip when the question is specifically about pattern: is this person's fat central or peripheral? It has the deepest cardiovascular epidemiology behind it, and it is the measure INTERHEART used. Its weaknesses are the hip landmark's poor reproducibility and the fact that it can fall for an unwelcome reason: a person who gains fat on the hips improves their ratio without improving anything else. Reading it next to the waist-alone figure, as this page does, closes that gap.
- Tracking your own change: waist circumference, measured the same way each month.
- One universal screening line and a concrete target: waist-to-height ratio.
- Describing the pattern of fat storage: waist-to-hip ratio.
- Confirming excess adiposity under the 2025 framework: BMI plus any one of the three.
Limitations and who this misreads
The ratio has no idea how big you are. A very lean, very small person and a much larger one can return an identical value, because both circumferences scale together. That is why the WHO publishes waist-alone action levels in the same table, and why this page shows them next to the ratio rather than hiding them behind a second click.
It also misreads particular bodies in particular directions. Narrow-hipped people of either sex are pushed toward their threshold on a waist that is not, on its own, remarkable, while a wide pelvis or well-developed glutes can hold the ratio comfortably under the line on a waist that is well past the WHO action level. Muscular trunks read as central fat, because a tape cannot tell one from the other. Pregnancy invalidates the measurement outright, as does significant abdominal distension from any cause, and the adult thresholds have no meaning in children or adolescents, whose proportions are still changing.
Finally, a threshold is not a diagnosis. Crossing 0.90 or 0.85 is a reason to look further (blood pressure, lipids, fasting glucose, a conversation with a clinician who can put the number in context) and nothing more than that. No calculator can distinguish the anthropometric criteria for excess adiposity from clinical obesity, which requires an assessment of organ function.
What to do with the number
If your ratio is at or above the threshold for your sex, re-take the hip measurement first: the iliac-crest error is common enough that verification is worth thirty seconds. If the number holds, look at the waist-alone figure and, if you have a height to hand, the waist-to-height ratio: three readings pointing the same way is a much stronger signal than any one of them.
The response to a confirmed central-adiposity signal is the ordinary one, and it is unglamorous. A moderate calorie deficit planned from your maintenance calories rather than a crash; enough protein to hold onto muscle while fat comes off; resistance training two or three times a week; and a GP appointment if the reading is well over the line or you have a family history of type 2 diabetes or cardiovascular disease, because blood tests see things a tape measure cannot. Re-measure monthly, in the same conditions, and judge by the direction of travel across several readings rather than by any single one.
How it's calculated
Waist-to-hip ratio
WHR = waist circumference ÷ hip circumference (both in the same unit)
Dimensionless: the unit cancels. Report to two decimal places; the hip landmark is not reproducible enough for a third.
WHO thresholds: substantially increased risk of metabolic complications
Men: WHR ≥ 0.90 · Women: WHR ≥ 0.85
From the report of the WHO expert consultation on waist circumference and waist–hip ratio, Geneva, December 2008.
WHO waist circumference action levels, shown alongside
Men: increased ≥ 94 cm, substantially increased ≥ 102 cm · Women: ≥ 80 cm and ≥ 88 cm
Independent of the ratio: generous hips can hold a ratio under its threshold while the waist itself is well past the action level.
The multi-measure check (2025 framework), when height and weight are supplied
BMI = weight kg ÷ (height m)²; confirm with at least one of waist circumference, WHR, or waist ÷ height ≥ 0.5
BMI of 40 or more is regarded as confirmatory on its own. This tests the anthropometric criteria only; the clinical assessment is a doctor's job.
Worked example: a woman with an 86 cm waist and a 98 cm hip
- Divide waist by hip in the same unit: 86 ÷ 98 = 0.8775…, which reports as 0.88.
- Compare with the WHO threshold for women: 0.88 is at or above 0.85, so it falls on the substantially-increased-risk side of the line.
- Check the waist on its own: 86 cm is at or above the 80 cm first action level for women and below the 88 cm second: the label for that band is 'increased'.
- Sanity-check the hip figure: 0.88 is well inside the plausible 0.6 to 1.3 range, so there is no sign of the iliac-crest error. Had the hip been mis-measured at 91 cm, the ratio would have read 0.95, a threshold crossed on a tape error alone.
- Add a height of 168 cm: 86 ÷ 168 = 0.51, which sits just inside the increased-central-adiposity band, and half her height is 84 cm, so the waist is 2 cm above that line. All three screens agree.
- Add a weight of 68 kg: BMI = 68 ÷ 1.68² = 24.1, which is inside the WHO normal range. BMI alone would have said nothing at all; the fat-distribution measures are the ones carrying the signal here.
- Read the multi-measure result honestly: BMI is not elevated, so the anthropometric criteria for excess adiposity are not met on the 2025 framework, but two independent distribution measures are above their lines, which is exactly the normal-weight central obesity pattern worth raising with a GP.
Where this number is used in the real world
- Cardiovascular risk screening, where INTERHEART established the ratio as a stronger correlate of heart attack than BMI across 52 countries.
- Metabolic syndrome assessment, where central adiposity is one of the defining components alongside blood pressure, triglycerides, HDL cholesterol and fasting glucose.
- The 2025 multi-measure obesity framework, in which waist-to-hip ratio is one of the accepted confirmatory measures of fat distribution.
- Diabetes risk conversations in primary care, where a central pattern of fat storage carries more weight than the number on the scale.
- Research and epidemiology, where waist and hip circumferences are routinely collected in large cohorts and the ratio can be derived retrospectively.
- Tracking the redistribution of fat through the menopause transition, where the waist rises and the hips fall without total weight necessarily changing.
- Cross-checking a BMI that looks out of step with the person in front of you, in either direction.
Frequently asked questions
What is a healthy waist-to-hip ratio?
Below 0.90 for men and below 0.85 for women keeps you under the WHO's 'substantially increased risk' thresholds. There is no bonus for driving the ratio ever lower; it is a screen, not a score to optimise. Pair it with the waist-alone cut-offs (94/102 cm men, 80/88 cm women) shown with your result, since both signals carry independent information.
How do I measure hips correctly?
Around the widest point of the buttocks, tape level with the floor, standing with feet together and weight even. The most common error is measuring at the hip bones (the iliac crest), which sits higher and reads smaller, inflating your ratio. Wear thin clothing or none, keep the tape snug without compressing, and average two or three passes.
Which is better: waist-to-hip or waist-to-height?
Both are accepted fat-distribution measures in the 2025 obesity framework, and both outperform BMI alone for cardiometabolic screening. Waist-to-height is easier to measure reliably and uses one universal 0.5 threshold; waist-to-hip adds information about fat pattern specifically and has deep epidemiological pedigree via studies like INTERHEART. Practical answer: measure your waist carefully and let it power both. This site calculates each.
My ratio came out above 1.0. Is that possible?
It is possible but uncommon, and the first thing to check is the hip measurement. A ratio above about 1.1, and certainly above 1.3, almost always means the hip tape was taken around the iliac crest (the bony points at the top of the pelvis that you find when you put your hands on your hips) rather than around the widest part of the buttocks several centimetres lower. That error reads small at the hip and pushes the ratio up sharply. Re-take it standing with feet together, tape level, at the widest point you can find, and compare the two figures before drawing any conclusion.
Can my waist-to-hip ratio improve for the wrong reasons?
Yes, and it is the measure's most important weakness. Because the hip circumference is the denominator, gaining fat on the hips and thighs lowers the ratio just as effectively as losing fat from the waist. Someone who gains five kilograms distributed in a pear pattern can watch their ratio improve while their total adiposity rises. This is exactly why this page shows your waist circumference against its own thresholds next to the ratio, and why waist-to-height is worth reading alongside it: neither of those can be improved by gaining fat anywhere.
Why does the threshold differ between men and women?
Because the typical pattern of fat storage differs. Women store proportionally more fat subcutaneously around the hips, buttocks and thighs, which makes the denominator of the ratio larger, so an equivalent amount of central fat produces a lower number than it would in a man. Setting the same threshold for both sexes would mean flagging almost no women and a great many men. The genetics back this up: of the 49 genetic loci linked to waist-to-hip ratio independently of BMI in the 2015 GIANT analysis, twenty showed significant differences between the sexes, and nineteen of those had a stronger effect in women.
Does waist-to-hip ratio change with age or menopause?
Substantially. Visceral fat accumulation accelerates during the menopause transition specifically, not just with ageing: longitudinal data from the SWAN cohort recorded an annualised visceral fat increase of roughly 6% through the transition, decelerating afterwards, while fat on the hips and thighs declined. That combination (waist up, hips down) moves the ratio in both terms at once, so many women see their number climb through their late forties and fifties with no change in diet or training. It is a real signal worth acting on, but it is not evidence of a personal failure.
Do I need a height and weight to use this calculator?
No. The ratio itself needs only a waist and a hip measurement, and you will get the full result with its threshold comparison without entering anything else. Adding a height and a weight unlocks the multi-measure assessment introduced by the 2025 obesity framework, which confirms excess adiposity with BMI plus at least one direct measure of fat distribution. Since you have already supplied both a waist and a hip, this page can run that complete check with two extra numbers, and it is the same panel our BMI calculator uses.
Keep going
A single number rarely tells the whole story. Alongside the waist-to-hip result, the waist-to-height calculator, the waist size calculator, the body roundness calculator, the BMI calculator and the healthy weight range calculator each add a different angle on the same measurements. For the reasoning behind the numbers, read Measure your waist, 2025 obesity definition and BMI vs body fat vs waist.
Sources
- WHO. Waist circumference and waist–hip ratio: report of a WHO expert consultation, Geneva, 8–11 December 2008. World Health Organization, 2011. www.who.int/publications/i/item/9789241501491
- Yusuf S, Hawken S, Ôunpuu S, et al. Obesity and the risk of myocardial infarction in 27,000 participants from 52 countries: a case-control study (INTERHEART). Lancet 2005;366:1640–9. doi.org/10.1016/S0140-6736(05)67663-5
- Shungin D, Winkler TW, Croteau-Chonka DC, et al. New genetic loci link adipose and insulin biology to body fat distribution. Nature 2015;518:187–96. doi.org/10.1038/nature14132
- Greendale GA, Sternfeld B, Huang M, et al. Changes in regional fat distribution and anthropometric measures across the menopause transition. J Clin Endocrinol Metab 2021;106:2520–34. doi.org/10.1210/clinem/dgab389
- Ross R, Neeland IJ, Yamashita S, et al. Waist circumference as a vital sign in clinical practice: a Consensus Statement from the IAS and ICCR Working Group on Visceral Obesity. Nat Rev Endocrinol 2020;16:177–89. doi.org/10.1038/s41574-019-0310-7
- Browning LM, Hsieh SD, Ashwell M. A systematic review of waist-to-height ratio as a screening tool for the prediction of cardiovascular disease and diabetes: 0.5 could be a suitable global boundary value. Nutr Res Rev 2010;23:247–69. doi.org/10.1017/S0954422410000144
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- Campbell, R. (2026). Waist-to-Hip Ratio Calculator. Body Stats. https://bodystats.co/app/waist-to-hip-ratio-calculator
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- “Waist-to-Hip Ratio Calculator”, Body Stats, last updated 12 September 2026, https://bodystats.co/app/waist-to-hip-ratio-calculator
Every formula and threshold on this page is written out with its primary source on our methodology page. These results are informational and educational, not a diagnosis or a substitute for professional advice. See the medical disclaimer.
Last updated . Written by Rick Campbell; not medically reviewed. See review status.