Waist-to-Hip Ratio Calculator

Background.

This waist to hip ratio calculator computes your waist-to-hip ratio (WHR) — a deceptively simple number that, on the balance of modern cardiometabolic evidence, predicts heart-attack and type-2-diabetes risk better than body mass index does. You enter your waist circumference, your hip circumference, your unit of choice (centimetres or inches), and your sex, and the tool returns the ratio to three decimal places along with the World Health Organization 2008 risk band — low, moderate, or high — that band sits in. No data leaves your device, there is no submit button, and there is no account requirement.

The reason WHR has earned the attention it has is that body fat is not metabolically uniform. Fat stored deep inside the abdominal cavity around the liver, pancreas, and intestines — visceral or 'central' adipose tissue — is hormonally active in ways that subcutaneous fat on the hips, thighs, and buttocks is not. Visceral fat secretes inflammatory cytokines, drains free fatty acids straight into the portal vein toward the liver, and is strongly associated with insulin resistance, dyslipidaemia, hypertension, and accelerated atherosclerosis. Subcutaneous gluteofemoral fat does almost the opposite: in several large prospective cohorts, higher hip circumference (at any given waist) has been associated with reduced cardiometabolic risk, possibly because it acts as a long-term storage depot that prevents lipid spillover into ectopic sites. Waist-to-hip ratio captures this distinction in a single, cheap, tape-measure-friendly number. A high WHR means you are carrying a relatively larger share of your fat in the android (apple-shaped) distribution. A low WHR means the gynoid (pear-shaped) pattern dominates.

The arithmetic is trivial — divide waist by hip in the same units — but the interpretation rests on landmark epidemiology. The INTERHEART case-control study, published by Yusuf and colleagues in The Lancet in 2005, examined 27,098 participants across 52 countries and found that waist-to-hip ratio showed a graded, monotonic relationship with first acute myocardial infarction; the population-attributable risk for the top WHR quintile versus the bottom was roughly 24%, and crucially the relationship held after adjustment for BMI, while BMI's own association with MI risk attenuated sharply once WHR was included. That finding alone shifted clinical thinking about how to screen for central obesity and is one of the main reasons the WHO convened its 2008 Expert Consultation on waist circumference and waist-hip ratio. The thresholds this calculator applies come directly from that consultation's Table 1. For men, a WHR of 0.90 or lower is classified as low risk, 0.91 to 0.99 as moderate, and 1.00 or higher as high. For women, 0.80 or lower is low risk, 0.81 to 0.84 is moderate, and 0.85 or higher is high. The asymmetry between the male and female cut-points reflects, at least partly, the fact that healthy adult women carry a larger share of subcutaneous fat on the hips and thighs than men do, so the same ratio means something different in the two groups. The thresholds are not magic numbers — they were chosen because cardiovascular mortality and incident type 2 diabetes risk inflect at roughly those values in pooled cohort data — but they are the most widely cited international cut-points in current use and the ones you will see in NIH NHLBI clinical guidelines and ACSM exercise-testing standards.

A worked example helps. A woman with an 85 cm waist and 100 cm hips has a WHR of 85 ÷ 100 = 0.85, which lands her right at the high-risk threshold for women under WHO 2008. A man with the same 85 cm waist and 100 cm hips has the identical 0.85 ratio, but for a male that number is comfortably inside the low-risk band — under 0.90. The number is the same; the interpretation is not. That is why the sex selector matters.

WHR has limits you should know about before you read your result. First, it is sensitive to how you measure. The WHO 2008 protocol specifies that the waist be measured horizontally at the midpoint between the lower margin of the last palpable rib and the top of the iliac crest, at the end of a normal exhale, with the tape snug but not compressing the skin; the hip should be measured at the widest portion of the buttocks. Inconsistent landmarks — measuring the waist at the umbilicus, or at the narrowest point above the navel, instead of at the iliac crest — can shift the ratio by several hundredths and bump you across a category boundary. Second, WHR cannot distinguish a high ratio that comes from a thick waist from one that comes from narrow hips. Some athletes, particularly those with substantial gluteal muscle, develop hips wide enough to depress their ratio into the low band even when their waist circumference alone is elevated. Conversely, very lean people with naturally narrow hips can land in moderate or high categories at waist sizes their clinician would not flag as concerning. For that reason many guidelines recommend pairing WHR with raw waist circumference (high-risk waist thresholds are typically ≥ 102 cm for men and ≥ 88 cm for women in European-ancestry populations) and, increasingly, with waist-to-height ratio (WHtR), which uses the simple rule of thumb 'keep your waist under half your height' and applies the same threshold to men and women, adults and children, and across most ethnic groups. Third, WHR was validated primarily in adult populations and is not designed for children, pregnant women, or people with conditions that distort body shape such as significant ascites or large hernias. Fourth, the WHO 2008 thresholds are global recommendations; some health systems use slightly different cut-points for South Asian and East Asian populations, where cardiometabolic risk rises at lower absolute waist circumferences.

With those caveats acknowledged, WHR remains one of the most cost-effective cardiometabolic screening numbers in clinical medicine. It requires nothing more than a tape measure, takes under a minute to compute, and outperforms BMI as a predictor of incident myocardial infarction, type 2 diabetes, and all-cause mortality in multiple meta-analyses, including the de Koning et al. 2007 analysis published in the European Heart Journal that pooled 258,114 participants. Use the number on this page as a screening signal, not a diagnosis: if it lands in the moderate or high band, that is a useful prompt to bring lipid panel, fasting glucose, blood pressure, and a frank conversation about diet, physical activity, and visceral fat to your next clinical visit.

What is waist-to-hip ratio calculator?

The waist-to-hip ratio (WHR) is a simple anthropometric index defined as waist circumference divided by hip circumference, both measured in the same units. Because the units cancel, the ratio itself is dimensionless. WHR is used clinically and epidemiologically as a proxy for central or 'android' obesity — the pattern of fat distribution in which adipose tissue accumulates around the abdomen rather than on the hips and thighs. That distinction matters because visceral abdominal fat is metabolically active and is independently associated with insulin resistance, type 2 diabetes, hypertension, dyslipidaemia, and cardiovascular disease, whereas subcutaneous gluteofemoral fat appears to be metabolically protective at any given waist size. The thresholds in routine use today come from the 2008 WHO Expert Consultation on waist circumference and waist-hip ratio, which proposed sex-specific cut-points of ≤ 0.90 (low), 0.91–0.99 (moderate), and ≥ 1.00 (high) for men, and ≤ 0.80, 0.81–0.84, and ≥ 0.85 for women. These cut-points were chosen because cardiovascular mortality and incident type 2 diabetes risk rise sharply beyond them in pooled prospective cohort data, most notably in the INTERHEART study (Yusuf et al., Lancet 2005). WHR is not a diagnostic test and it does not measure body fat directly. It is a fast, reproducible screen that complements — and in several head-to-head comparisons outperforms — body mass index as a predictor of cardiometabolic events. Modern clinical practice typically reads WHR together with raw waist circumference, waist-to-height ratio, blood pressure, lipid panel, and fasting glucose to build a fuller picture of cardiometabolic risk than any single index can provide.

How to use this calculator.

1. 01Choose your units in the Units dropdown. The ratio itself is unit-independent — waist ÷ hip gives the same number whether you measure in centimetres or inches — but you need to enter both values in the same unit.
2. 02Measure your waist correctly. Stand relaxed, place a flexible non-stretch tape measure horizontally at the top of the iliac crest (the bony ridge on the side of your hip), and read the circumference at the end of a normal exhale. Do not suck in your stomach and do not compress the skin.
3. 03Measure your hip correctly. With feet together and weight evenly distributed, place the tape horizontally around the widest part of your buttocks. Make sure the tape is level all the way around — a tilted tape will inflate the reading.
4. 04Enter the two measurements in the Waist and Hip fields.
5. 05Select your sex. The WHO 2008 thresholds differ for men and women because healthy fat distribution patterns differ by sex.
6. 06Read the ratio in the results panel. It is rounded to three decimal places.
7. 07Read the WHO risk category beneath the ratio — Low, Moderate, or High — and use it as a screening signal, not a diagnosis. Bring the number to your clinician along with a recent lipid panel, fasting glucose, and blood pressure if it lands in the moderate or high band.

The formula.

The formula is WHR = waist ÷ hip, with both measurements in the same units. Because the units cancel, the ratio is dimensionless — 85 cm ÷ 100 cm and 33.46 in ÷ 39.37 in both equal 0.850. This calculator stores the canonical centimetre values for the record (converting inches to centimetres at the NIST SP 811 exact factor of 2.54 cm/in) but the ratio itself is computed directly from the entered values in the original unit, which avoids any rounding drift between unit systems. The risk band is assigned by a simple sex-specific lookup against the WHO 2008 Expert Consultation Table 1. For men: ≤ 0.90 → Low (code 0); 0.91 to 0.99 → Moderate (code 1); ≥ 1.00 → High (code 2). For women: ≤ 0.80 → Low (code 0); 0.81 to 0.84 → Moderate (code 1); ≥ 0.85 → High (code 2). Boundary values fall in the lower-risk band — a male WHR of exactly 0.90 is classified Low, and a female WHR of exactly 0.80 is classified Low — which matches the WHO 2008 wording. The asymmetry between the sex-specific cut-points reflects baseline differences in healthy fat distribution: adult women carry, on average, a larger share of subcutaneous fat on the hips and thighs, so the same ratio represents a different metabolic state in the two sexes.

A worked example.

Frequently asked questions.

References& sources.

1. [1]World Health Organization — Waist Circumference and Waist-Hip Ratio: Report of a WHO Expert Consultation, Geneva, 8–11 December 2008. ISBN 978 92 4 150149 1. Table 1 sex-specific cut-points used by this calculator.
2. [2]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 366(9497):1640–1649 (2005). Landmark finding that WHR predicts first MI better than BMI across world regions.
3. [3]de Koning L, Merchant AT, Pogue J, Anand SS — Waist circumference and waist-to-hip ratio as predictors of cardiovascular events: meta-regression analysis of prospective studies. European Heart Journal 28(7):850–856 (2007). Pooled 258,114 adults and confirmed WHR outperforms BMI for cardiovascular event prediction.
4. [4]National Heart, Lung, and Blood Institute (NIH) — Clinical Guidelines on the Identification, Evaluation, and Treatment of Overweight and Obesity in Adults (NIH Publication No. 98-4083, 1998). U.S. clinical reference for waist circumference and waist-hip ratio thresholds in cardiometabolic risk assessment.
5. [5]American College of Sports Medicine — ACSM's Guidelines for Exercise Testing and Prescription (11th edition, Wolters Kluwer 2021). Adopts WHO 2008 WHR thresholds for cardiometabolic risk stratification in pre-exercise screening.
6. [6]Ashwell M, Gunn P, Gibson S — Waist-to-height ratio is a better screening tool than waist circumference and BMI for adult cardiometabolic risk factors: systematic review and meta-analysis. Obesity Reviews 13(3):275–286 (2012). Context for WHR vs WHtR head-to-head comparison.