Understanding your waist-to-hip ratio
This calculator groups ratios into three ranges anchored to the WHO 2008 expert consultation cut-offs, which define substantially increased risk of metabolic complications at a WHR of 0.90 or above in men and 0.85 or above in women.
| Range | Men (WHR) | Women (WHR) |
|---|---|---|
| Low | Below 0.90 | Below 0.80 |
| Moderate | 0.90 – 0.99 | 0.80 – 0.84 |
| High | 1.00 and above | 0.85 and above |
- The WHO cut-offs are population screening values; individual risk depends on waist circumference, blood pressure, lipids, glucose, family history and lifestyle, interpreted by a clinician.
- WHR is sensitive to measurement technique — measuring the waist at the navel instead of the WHO landmark, or pulling the tape tight, changes the result.
- WHR interpretation was developed for adults; it does not apply to children, and pregnancy makes the waist measurement uninformative.
What is the waist-to-hip ratio?
The waist-to-hip ratio (WHR) is a dimensionless number obtained by dividing waist circumference by hip circumference, measured in the same units. It describes how body fat is distributed: a higher ratio indicates proportionally more fat stored around the abdomen, while a lower ratio indicates more fat stored around the hips and thighs.
Abdominal (visceral) fat is metabolically active and is associated with higher risk of type 2 diabetes and cardiovascular disease than fat stored on the hips and thighs. The World Health Organization's 2008 expert consultation on waist circumference and waist-hip ratio concluded that WHR values of 0.90 or above in men and 0.85 or above in women indicate substantially increased risk of metabolic complications.
The large international INTERHEART case-control study (Yusuf et al., The Lancet 2005) found that waist-to-hip ratio showed a stronger graded association with myocardial infarction than BMI across 52 countries, which is one reason clinicians measure fat distribution in addition to overall weight status.
WHR is a screening indicator, not a diagnosis. Measurement technique affects the result, and clinicians interpret it alongside BMI, waist circumference, blood pressure, blood lipids and other assessments.
How to use this waist-to-hip ratio calculator
- Measure your waist at the midpoint between the lower margin of the last palpable rib and the top of the hip bone (iliac crest), following the WHO measurement protocol, with the tape snug but not compressing the skin.
- Measure your hips at the widest part of the buttocks, keeping the tape parallel to the floor.
- Enter both measurements in the same unit — the ratio itself is unit-independent.
- Select your sex, because the WHO cut-offs differ for men and women.
- Read your ratio and its range against the WHO 2008 reference values.
The formula behind the waist-to-hip ratio
The waist-to-hip ratio is a simple division of two circumferences taken in the same unit. Because it is a ratio, the result is identical whether you measure in centimetres or inches.
Example: a person with an 80 cm waist and 100 cm hips has a WHR of 80 ÷ 100 = 0.80.
Common mistakes
- Measuring the waist at the navel rather than at the WHO landmark — the midpoint between the lowest rib and the top of the hip bone.
- Measuring over bulky clothing or pulling the tape tight enough to compress the skin, which distorts both circumferences.
- Mixing units — entering the waist in inches and the hips in centimetres produces a meaningless ratio.
- Measuring the hips at the hip bone instead of at the widest part of the buttocks.
- Comparing a result against the opposite sex's cut-offs — the WHO reference values are 0.90 for men and 0.85 for women.
자주 묻는 질문
What is a healthy waist-to-hip ratio?
According to the WHO 2008 expert consultation, the risk of metabolic complications is substantially increased at a waist-to-hip ratio of 0.90 or above in men and 0.85 or above in women. Ratios below roughly 0.90 for men and 0.80 for women are generally considered lower risk on population screening.
How do I measure my waist and hips correctly?
Following the WHO protocol, measure the waist at the midpoint between the lower margin of the last palpable rib and the top of the iliac crest (hip bone), at the end of a normal breath out. Measure the hips around the widest portion of the buttocks with the tape parallel to the floor. Keep the tape snug but not compressing the skin.
Is waist-to-hip ratio better than BMI?
They measure different things. BMI screens overall weight relative to height, while waist-to-hip ratio describes fat distribution. The INTERHEART study (The Lancet, 2005) found WHR more strongly associated with heart-attack risk than BMI. Health agencies typically use both, along with waist circumference, rather than choosing one.
Does the waist-to-hip ratio depend on units?
No. Because WHR divides one circumference by another, the units cancel out. A 32-inch waist with 40-inch hips and an 81.3 cm waist with 101.6 cm hips both give a ratio of 0.80. The only requirement is that both measurements use the same unit.
Why do the cut-offs differ for men and women?
Men and women store fat differently: women typically carry proportionally more fat on the hips and thighs (a gynoid pattern), while men more often store fat abdominally (an android pattern). The WHO therefore set sex-specific cut-offs — 0.90 for men and 0.85 for women — for substantially increased metabolic risk.
What are the limitations of the waist-to-hip ratio?
WHR does not measure total body fat, and it can stay stable even when both waist and hip measurements change together. It is sensitive to measurement technique, is not validated for children, and is uninformative during pregnancy. Clinicians interpret it as one screening indicator among several.
참고 자료
- World Health Organization. Waist circumference and waist–hip ratio: report of a WHO expert consultation, Geneva, 8–11 December 2008. WHO, 2011.
- Yusuf S et al. Obesity and the risk of myocardial infarction in 27,000 participants from 52 countries (INTERHEART): a case-control study. The Lancet 2005; 366(9497): 1640–1649.
- World Health Organization. Obesity: preventing and managing the global epidemic. WHO Technical Report Series 894 (2000).
- Centers for Disease Control and Prevention (CDC). Assessing your weight — waist circumference guidance. cdc.gov.
- NHS. Why waist size matters — measuring your waist. nhs.uk.