Waist-to-Hip Ratio Calculator
Find your WHR and WHO health-risk category
⚖️ Your measurements
WHO risk thresholds differ by sex.
Last updated June 2026
Method: Waist-to-hip ratio is waist ÷ hip. Risk categories use the World Health Organization (WHO) sex-specific cut-offs: low, moderate and high risk for men and women.
Included: WHR calculation in inches or centimeters, sex-specific WHO risk classification, a measurement guide, and the full risk-category table for men and women.
Not included: Muscle mass, body frame, pregnancy, age-specific adjustments and individual medical history. WHR is a single screening indicator, not a complete health assessment.
Not medical advice: This tool provides an estimate for general information only. Consult a qualified healthcare professional before making health decisions.
Waist-to-hip ratio calculator: what your WHR means
Suppose a man measures a 36-inch waist and 40-inch hips. Dividing 36 by 40 gives a waist-to-hip ratio of 0.90. Using the World Health Organization (WHO) cut-offs, that lands right at the edge of the moderate-risk band for men. A woman with a 30-inch waist and 40-inch hips would have a ratio of 0.75 - comfortably in the low-risk range. This waist-to-hip ratio calculator (also called a WHR calculator) does that math instantly and tells you which WHO category you fall into.
The waist-to-hip ratio formula
The calculation is a simple division. Because it is a ratio, the units cancel, so inches and centimeters give the same answer as long as you measure both the same way:
WHR = waist measurement ÷ hip measurement For the example above: 36 ÷ 40 = 0.90. A lower ratio means relatively less fat is stored around the abdomen. Because abdominal fat is more closely tied to health risk than fat on the hips and thighs, the ratio is a quick way to gauge fat distribution rather than total weight.
WHO health-risk categories
The WHO defines sex-specific thresholds because men and women store fat differently:
- Men - Low risk: below 0.90 · Moderate: 0.90-0.99 · High: 1.0 and above.
- Women - Low risk: below 0.80 · Moderate: 0.80-0.84 · High: 0.85 and above.
A higher ratio is associated with greater risk of cardiovascular disease and type 2 diabetes. These bands are screening guides, not diagnoses - a single measurement should be read alongside other indicators and a professional assessment.
How to measure accurately
Measurement technique changes the result more than people expect. Stand relaxed and breathe out normally before reading the tape. Measure your waist at its narrowest point, usually just above the belly button, and your hips at the widest part of the buttocks. Keep the tape horizontal and snug without digging into the skin. Taking the same measurements at the same time of day improves consistency when you track changes over time.
Waist-to-hip ratio vs BMI
BMI and WHR answer different questions. BMI compares your weight to your height but says nothing about where fat sits, so a muscular person can score "overweight" on BMI alone. Waist-to-hip ratio captures fat distribution, and an apple-shaped pattern (more abdominal fat) carries higher risk than a pear-shaped one. Using BMI and WHR together gives a more complete snapshot than either number on its own.
How to use this calculator
You only need two measurements and your sex to get a result. Work through the fields in order:
- Pick your unit: choose inches or centimeters. It does not matter which you use, as long as both measurements use the same one - the ratio comes out the same either way.
- Enter your waist: measure at the narrowest point of your torso, usually just above the belly button, after breathing out normally.
- Enter your hips: measure around the widest part of your buttocks, keeping the tape level all the way around.
- Select your sex: this tells the calculator which WHO cut-offs to apply, because the low, moderate and high-risk bands differ for men and women.
The result updates instantly. Read your ratio first, then your WHO risk category, and compare it against the full risk table to see how much room you have before the next threshold.
A second worked example
Imagine a woman with a 32-inch waist and 38-inch hips. Dividing 32 by 38 gives a ratio of about 0.84, which sits at the top of the moderate-risk band for women (0.80-0.84) and just below the high-risk line of 0.85. If she trims her waist by an inch to 31 while her hips stay at 38, the ratio falls to about 0.82 - still moderate, but with more breathing room. The same arithmetic works in centimeters: an 81 cm waist and 96 cm hips give 81 ÷ 96 = 0.84, exactly the same answer. This shows why a single inch off the waist can matter more than the same change at the hips, since the waist is the number doing most of the moving.
Who this calculator is for
Waist-to-hip ratio is a quick, equipment-light screen, which makes it useful for a range of people:
- People watching their heart-health risk who want a number that reflects fat distribution, not just total weight.
- Anyone whose BMI looks "normal" but who still carries noticeable belly fat - WHR can flag risk that BMI misses.
- Athletes and lifters whose muscle mass can inflate BMI, since WHR focuses on shape rather than weight.
- People tracking a fat-loss program who want a simple, repeatable measurement to follow over weeks.
- Anyone preparing for a check-up who wants context before discussing their numbers with a clinician.
What changes your waist-to-hip ratio
Several factors push the ratio up or down, some controllable and some not:
- Abdominal (visceral) fat: the biggest lever. More fat stored around the organs widens the waist and raises the ratio.
- Sex: women naturally store more fat at the hips and thighs, which lowers their ratio, so the WHO uses separate thresholds.
- Age: abdominal fat tends to increase and muscle to decline over time, gradually nudging the ratio higher.
- Genetics: some people are predisposed to apple-shaped (abdominal) storage and others to pear-shaped (hip and thigh) storage.
- Measurement technique: tape placement, posture and whether you breathe out can shift the result by a few hundredths.
How to improve your number
Because the waist usually moves more than the hips, most improvement comes from reducing abdominal fat. Approaches that tend to help include:
- A modest calorie deficit: sustained fat loss shrinks visceral fat first for many people, lowering waist size.
- Regular aerobic activity: brisk walking, cycling or running is consistently linked with less abdominal fat.
- Strength training: building or preserving muscle supports a healthier body composition as you lose fat.
- Better sleep and lower chronic stress: both are associated with reduced belly-fat storage over time.
- Limiting added sugar and alcohol: cutting back on these calorie-dense, easy-to-overconsume sources often helps trim the waist.
Spot exercises like crunches build the muscle underneath but do not selectively burn the fat on top, so overall fat loss is what moves the ratio. Expect gradual change measured in weeks, not days.
Limitations and assumptions
WHR is a screening estimate, so read it with its limits in mind:
- It does not distinguish fat from muscle, so a very muscular waist or hips can skew the result.
- It is not adjusted for age, ethnicity or body frame, even though healthy ranges can vary across groups.
- It is not valid during pregnancy, when the waist measurement reflects the growing uterus rather than fat distribution.
- The WHO cut-offs are population thresholds; sitting just over a line is not a diagnosis of any condition.
- A single reading can be thrown off by measurement error - trends over time are more reliable than one number.
How it compares to related calculators
WHR answers "where is my fat stored?" If you have a different question, a sister tool may fit better:
- To estimate overall weight relative to height, use the BMI Calculator.
- To estimate the share of your body that is fat, use the Body Fat Calculator.
- To find a target weight range for your height, use the Ideal Weight Calculator.
Used together, these give a fuller picture than any single number: total weight, fat percentage, and where that fat is distributed.
Sources
- World Health Organization (WHO) - Waist Circumference and Waist-Hip Ratio: Report of a WHO Expert Consultation (sex-specific risk cut-offs).
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK / NIH) - Weight Management and body-fat distribution.
- Centers for Disease Control and Prevention (CDC) - Assessing Your Weight.
⚠️ Common mistakes & edge cases
Measuring the waist in the wrong place
The waist is the narrowest point of the torso, not the line where your pants sit. Measuring lower (at the hips or over the widest part of the belly) inflates the number and can push you into a higher risk band.
Mixing up waist and hip measurements
WHR is waist divided by hip. Swapping the two flips the ratio (you would divide hip by waist) and gives a value below the real one. Double-check which figure goes where.
Using different units for each measurement
Both measurements must use the same unit. Entering waist in inches and hip in centimeters produces a meaningless ratio. This calculator keeps both inputs in the same unit to prevent that.
Treating WHR as the whole story
The ratio does not account for muscle, body frame, pregnancy or medical conditions. A pregnant person or a heavily muscled athlete may get a misleading result. Read it as one signal among many.
❓ Frequently asked questions
How do you calculate waist-to-hip ratio?
Divide your waist measurement by your hip measurement, using the same units for both. For example, a 36-inch waist divided by a 40-inch hip gives a waist-to-hip ratio (WHR) of 0.90. Because it is a ratio, the units cancel out, so inches and centimeters give the same result as long as you measure both with the same tape.
What is a healthy waist-to-hip ratio?
Using the World Health Organization (WHO) cut-offs, a low-risk ratio is below 0.90 for men and below 0.80 for women. A ratio of 0.90-0.99 for men or 0.80-0.84 for women is moderate risk, and 1.0 or higher for men or 0.85 or higher for women is high risk for cardiovascular and metabolic conditions.
Where exactly do I measure my waist and hips?
Measure your waist at the narrowest point of your torso, usually just above the belly button, after a normal exhale. Measure your hips at the widest part of your buttocks. Keep the tape level all the way around, snug against the skin but without compressing it, and stand relaxed rather than sucking in.
Is waist-to-hip ratio better than BMI?
They measure different things. BMI estimates overall weight relative to height but cannot tell where fat is stored. Waist-to-hip ratio captures fat distribution, and abdominal (apple-shaped) fat is more strongly linked to heart disease and type 2 diabetes than hip and thigh fat. Many clinicians use both together for a fuller picture.
Why does the threshold differ for men and women?
Men and women naturally store fat differently. Women typically carry more fat around the hips and thighs, lowering their ratio, while men store more around the abdomen. The WHO sets separate cut-offs so the same level of health risk maps to the appropriate ratio for each sex.
Can I lower my waist-to-hip ratio?
Often yes. Reducing visceral (belly) fat through a calorie-controlled diet, regular aerobic activity and strength training tends to shrink waist size and lower the ratio. Changes in the hip measurement are usually smaller, so most improvement comes from the waist. Progress varies by person, so track it over weeks, not days.
Is this calculator medical advice?
No. Waist-to-hip ratio is a useful screening estimate, not a diagnosis. It does not account for muscle mass, body frame, pregnancy or your full medical history. Use it to spot trends and discuss any concerns with a qualified healthcare professional.
How is waist-to-hip ratio different from waist-to-height ratio?
Both look at where you carry fat, but they use different reference points. Waist-to-hip ratio (WHR) compares your waist to your hips, while waist-to-height ratio (WHtR) compares your waist to your height, with a common guideline of keeping your waist under half your height. WHtR needs only one body measurement plus your height and works well across ages and ethnic groups, whereas WHR specifically captures the hip-versus-abdomen fat pattern. They complement each other rather than replace one another.
Does waist-to-hip ratio change with age?
It often does. Many people lose muscle and gain abdominal fat as they get older, which tends to raise the waist measurement and therefore the ratio even when overall weight is stable. Hormonal changes around menopause can shift fat storage toward the abdomen in women, nudging the ratio upward. Because the WHO cut-offs are not age-adjusted, an older adult sitting near a threshold should read the result as one trend among several rather than a hard line.
How often should I re-measure my waist-to-hip ratio?
For tracking changes, once every two to four weeks is plenty. Body measurements fluctuate day to day with hydration, meals, posture and time of day, so daily checks mostly capture noise. Measure under the same conditions each time - same tape, same spots, after a normal exhale, ideally in the morning - and compare the trend over a month or more rather than any single reading.
💡 Good to know
A "normal" BMI can still hide a high WHR
Two people at the same weight and height can have very different fat distribution. Someone with a healthy BMI but a high waist-to-hip ratio may still carry the abdominal fat most linked to heart and metabolic risk - which is exactly the gap this ratio is designed to catch.
Technique can move you a whole risk band
Measuring the waist too low, over clothing, or while sucking in can change the number by enough to push you into a different category. Measure at the narrowest point over bare skin, after a normal exhale, and use the same method every time you compare.
The waist usually does the moving
When the ratio improves, it is almost always because the waist shrank, not because the hips changed. Tracking your waist measurement alone over a few weeks is often the clearest early sign that your ratio is heading in the right direction.