📐 Waist to Hip Ratio Calculator: Check Your WHR and Health Risk

What is the Waist to Hip Ratio Calculator?

Your waist to hip ratio is your waist circumference divided by your hip circumference, and nothing else. If your waist is 70 cm and your hips are 95 cm, your ratio is 70 divided by 95, which is 0.74. Because both measurements are lengths in the same unit, the unit cancels out: you get the exact same 0.74 whether you measure in centimetres or inches, so the cm/in toggle on this tool is only there to match the tape you happen to be holding. That is why WHR is so robust as a home measurement. There is no formula to memorise and no conversion to get wrong.

What makes WHR useful is not the single number but what it says about the shape of your body. A high ratio means your waist is large relative to your hips, which points to central or abdominal fat, sometimes called an apple shape. A lower ratio means fat is distributed more toward the hips and thighs, a pear shape. This distinction matters because the fat packed deep inside the abdomen, known as visceral fat, wraps around the liver, pancreas and intestines and is far more metabolically active than the softer fat under the skin of the hips. Visceral fat is the fat most strongly linked to type 2 diabetes, high blood pressure, unhealthy cholesterol and heart disease, which is why two people of the same weight and BMI can have very different health risk depending on where they store fat.

The World Health Organization set the cutoffs this calculator uses in its 2008 expert consultation on waist circumference and waist-hip ratio. For men, a ratio below 0.90 is low risk, 0.90 up to 0.99 is moderate, and 1.0 or above is high risk. For women, a ratio below 0.80 is low risk, 0.80 up to 0.84 is moderate, and 0.85 or above is high risk. The thresholds differ by sex because women naturally carry more fat on the hips and thighs, so the same ratio means something different for a man and a woman. These bands are population-level guides, not personal diagnoses, but they are backed by large studies showing that abdominal fat predicts cardiovascular events even after accounting for BMI.

WHR is often compared with two other simple measures: BMI and plain waist circumference. BMI divides weight by height squared and cannot tell where fat sits or separate muscle from fat, so a muscular athlete and someone with a lot of belly fat can share the same BMI. Waist circumference alone is a strong single number, and many clinicians now prefer it or the waist-to-height ratio for simplicity. WHR adds the hip measurement, which captures body shape and can flag risk in people whose BMI looks normal but who still carry central fat, a pattern sometimes called normal weight central obesity. No single number is perfect, and using two of them together gives a fuller picture than any one alone.

Accuracy depends entirely on measuring the same spots the same way each time. The waist should be taken at the midpoint between the bottom of your lowest rib and the top of your hip bone, roughly level with the navel for most people, after breathing out normally and without sucking in. The hip should be taken at the widest part of your buttocks. Keep the tape horizontal and snug against the skin without compressing it. Because the ratio is sensitive to both numbers, a tape that slips a couple of centimetres can move you across a category line, so it is worth measuring twice and taking the average.

One limitation worth knowing is that WHR can be misleading at the extremes. Very muscular hips or glutes can lower the ratio and mask abdominal fat, while pregnancy, bloating or certain body types can distort it in the other direction. The WHO cutoffs were derived largely from adult populations and are not designed for children, pregnant women or athletes with unusual builds. Treat your result as a useful screening signal that is worth acting on if it lands in the moderate or high band, not as the final word on your health. Tracking the trend of your own ratio over months, using the same tape and the same technique, is more informative than any single reading.

When to use it

• Checking whether you carry too much fat around your middle using only a tape measure at home.
• Screening for cardiometabolic risk when your BMI looks normal but your waist seems large.
• Tracking body shape change during a fat-loss plan, where the trend of the ratio matters more than one reading.
• Comparing your abdominal fat measurement against WHO risk bands for your sex.
• Giving a doctor or trainer a quick, reproducible body shape number alongside weight and BMI.
• Understanding whether you are more of an apple or pear body shape and what that means for health.

How to use the Waist to Hip Ratio Calculator

1. Select your sex, since men and women use different WHO risk cutoffs.
2. Choose centimetres or inches to match your tape measure (the ratio is the same either way).
3. Measure your waist at the midpoint between your lowest rib and hip bone, then enter it.
4. Measure your hip at the widest point of your buttocks and enter it.
5. Read your waist to hip ratio to two decimals and your risk category instantly.
6. Use the Copy result button to save the number for a health log or to share with a professional.

Formula & method

Worked examples

WHO waist to hip ratio risk categories (2008 expert consultation)

How the main body fat screening numbers compare

Where to place the tape for each measurement

Common mistakes to avoid

• Measuring the waist at the wrong height. Many people measure at the belt line, which is often below the true waist. Use the midpoint between your lowest rib and hip bone, roughly level with the navel, and use the same spot every time.
• Sucking the stomach in. Pulling your belly in shrinks the waist reading and lowers your ratio artificially. Stand relaxed and take the measurement just after breathing out normally.
• Pulling the tape too tight. A tape dug into the skin reads smaller than your real circumference. Keep it snug and level, just touching the skin without compressing it, for both the waist and the hip.
• Using the wrong hip point. The hip should be measured at the widest part of the buttocks, not at the hip bones or the top of the pelvis. Measuring too high gives a smaller hip number and a misleadingly high ratio.
• Treating the category line as exact. A ratio a hundredth either side of a cutoff is not a meaningful difference. Small tape errors can move you across a line, so read the band as a guide and watch the trend, not a single reading.
• Assuming the unit changes the answer. Because waist and hip are both lengths, the unit cancels out. Measuring in inches instead of centimetres gives the identical ratio, so there is no need to convert before dividing.

Glossary

Waist to hip ratio (WHR)

Waist circumference divided by hip circumference, a unit-free number that describes where you carry fat.

Waist circumference

The distance around your waist at the midpoint between the lowest rib and the top of the hip bone.

Hip circumference

The distance around the widest part of your buttocks.

Visceral fat

Fat stored deep in the abdomen around the organs, more strongly linked to disease than fat under the skin.

Apple shape

A body shape where fat concentrates around the middle, giving a higher waist to hip ratio.

Pear shape

A body shape where fat concentrates on the hips and thighs, giving a lower waist to hip ratio.

BMI

Body mass index, weight divided by height squared, a quick screen that ignores fat location and cannot separate muscle from fat.

Cardiometabolic risk

The combined risk of heart disease, stroke and type 2 diabetes, which rises with more abdominal fat.

Frequently asked questions

Sources

• Waist Circumference and Waist-Hip Ratio: Report of a WHO Expert Consultation , World Health Organization (2011)
• Aim for a Healthy Weight , National Heart, Lung, and Blood Institute (NIH)
• Abdominal fat and what to do about it , Harvard Health