Waist-to-Hip Ratio Calculator
Calculate your waist-to-hip ratio and see the WHO health-risk category for your sex — a measure of where you carry fat that BMI cannot capture.
How to use this calculator
- 1Measure your waist at its narrowest point, usually around the navel, without pulling the tape tight.
- 2Measure your hips at their widest point.
- 3Enter both measurements in the same units and select your sex.
- 4Read your ratio and its health-risk category.
How it works
Waist-to-hip ratio
WHR = waist circumference ÷ hip circumference measure waist at the narrowest point, hip at the widest the units cancel, so cm and inches give the same ratio risk (WHO): men ≥ 0.90, women ≥ 0.85 is high
Waist-to-hip ratio is simply the circumference of your waist divided by the circumference of your hips. Because it is a ratio of two lengths, the units cancel and it comes out the same whether you measure in centimetres or inches. Its value lies in what it reveals about fat distribution: a higher ratio means proportionally more fat is stored around the abdomen rather than the hips and thighs. This matters because abdominal (visceral) fat, which packs around the internal organs, is far more metabolically harmful than fat carried lower down. The World Health Organization uses thresholds of 0.90 for men and 0.85 for women, above which the risk of heart disease, type 2 diabetes, and other conditions rises sharply, regardless of a person's overall weight or BMI.
Worked example
A man with a 90 cm waist and 100 cm hips has a ratio of 90 ÷ 100 = 0.90, which sits right at the threshold the WHO classes as elevated risk for men. A woman with the same measurements would have the same 0.90 ratio, but for women the high-risk line is 0.85, so it would fall further into the elevated range.
Waist-to-Hip Ratio Calculator: the complete guide
Why where you carry fat matters
Two people can weigh the same and have the same BMI yet face very different health risks, and a large part of the reason is fat distribution. Fat stored around the hips and thighs — the 'pear' shape — behaves quite differently from fat stored around the abdomen — the 'apple' shape. Abdominal fat includes visceral fat, which surrounds the liver, pancreas, and intestines and is metabolically active in harmful ways, releasing fatty acids and inflammatory signals that disrupt insulin sensitivity and raise cardiovascular risk.
Waist-to-hip ratio is a simple proxy for this distribution. A high ratio flags an apple shape with more central fat, which research consistently links to heart disease, stroke, and type 2 diabetes — often more strongly than BMI does. This is why a normal-weight person with a high waist-to-hip ratio can still be at meaningful risk, a phenomenon sometimes called 'skinny fat'. The ratio captures a dimension of health that stepping on a scale simply cannot.
WHR versus BMI and waist circumference
BMI, the ratio of weight to height squared, is the most familiar body measure, but it has a well-known blind spot: it says nothing about body composition or fat location. A muscular athlete and a sedentary person can share a BMI, and someone of healthy weight can still carry dangerous amounts of visceral fat. Waist-to-hip ratio addresses exactly this gap, which is why health researchers often use the two together rather than relying on BMI alone.
Waist circumference on its own is another useful measure and is sometimes preferred for simplicity, since it does not require a hip measurement. Each has trade-offs: waist-to-hip ratio accounts for frame size to some degree by comparing waist against hips, while raw waist circumference is easier to measure consistently. Many clinicians look at all of these together — BMI for overall weight, and waist measures for fat distribution — to build a fuller picture than any single number provides.
Measuring accurately and reading the result
The ratio is only as good as the measurements, and small technique errors change the result. Measure the waist at its narrowest point, typically just above the navel, standing relaxed and breathing out normally — not sucking in. Measure the hips at their widest point around the buttocks. Keep the tape horizontal and snug but not compressing the skin, and take each measurement twice to check consistency. Because both numbers feed a ratio, a sloppy measurement of either throws off the result.
Interpret the category as a screening signal, not a diagnosis. A ratio in the elevated range is a prompt to pay attention to abdominal fat through diet and activity, and perhaps to discuss cardiovascular risk with a doctor, but it is one input among many. Age, ethnicity, muscle, and overall fitness all matter, and the thresholds are population averages that fit some body types better than others. Used sensibly alongside other measures, waist-to-hip ratio is a quick, cheap, and genuinely informative check that requires nothing more than a tape measure.
Frequently asked questions
What is a healthy waist-to-hip ratio?
The WHO considers below 0.90 low-risk for men and below 0.80 for women. Men at or above 0.90 and women at or above 0.85 fall into the high-risk category, linked to greater cardiovascular and metabolic risk regardless of overall weight.
Is waist-to-hip ratio better than BMI?
It measures something BMI can't: where you carry fat. Abdominal fat is more harmful than fat on the hips and thighs, and a high ratio predicts heart disease and diabetes risk that BMI misses. They're best used together — BMI for overall weight, WHR for fat distribution.
How do I measure my waist and hips correctly?
Measure the waist at its narrowest point, usually just above the navel, breathing out normally without sucking in. Measure the hips at their widest point around the buttocks. Keep the tape horizontal and snug but not tight, and use the same units for both.
Do inches or centimetres matter for the ratio?
No — because waist-to-hip ratio divides one length by another, the units cancel out and you get the same number either way. Just make sure both the waist and hip measurements are in the same unit before dividing.