Waist-to-Hip Ratio Calculator

To calculate your waist-to-hip ratio (WHR), divide your waist by your hip measurement in the same units. A 36-inch waist over 40-inch hips gives 36 ÷ 40 = 0.90. Under the World Health Organization cut-offs, a ratio of 0.90 or more in men or 0.85 or more in women signals a substantially increased risk of metabolic complications, so 0.90 is right at the line for a man and above it for a woman. This calculator does the division instantly and shows where you stand.

WHR shows where your fat sits; sibling tools cover the rest. Use the BMI Calculator for weight relative to height, the BMR Calculator for the calories you burn at rest, the TDEE Calculator for your full daily burn, and the Calorie Calculator to plan the deficit that actually trims your waist.

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:

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 cut-off points

The WHO expert consultation on waist circumference and waist-hip ratio (held in 2008, report published 2011) lists these sex-specific cut-offs for the risk of metabolic complications:

• Waist-to-hip ratio: 0.90 or more for men, 0.85 or more for women: substantially increased risk.
• Waist circumference: over 94 cm (37 in) for men or over 80 cm (31.5 in) for women: increased risk; over 102 cm (40 in) for men or over 88 cm (34.6 in) for women: substantially increased risk.

There is only one WHO cut-off for the ratio itself, so this calculator does not invent finer "low" or "moderate" ratio bands. A higher ratio is associated with greater risk of type 2 diabetes and cardiovascular disease, but these are screening thresholds, not diagnoses. The WHO also noted that risk at a given measurement varies between populations, for example people of Asian descent.

Waist-to-hip ratio chart by waist and hip size

This chart reads your WHR straight off your two measurements: find your hip size down the left, your waist size across the top, and the cell is your ratio (waist ÷ hip). All values are in inches; because WHR is unitless, the same figures apply if you measure in centimeters.

Reading across any row shows how fast the ratio climbs: on 40-inch hips, moving from a 32-inch to a 36-inch waist takes you from 0.80 to 0.90, past the women's 0.85 cut-off and up to the men's 0.90 cut-off.

What waist size keeps you below the WHO cut-off?

Because the WHO cut-offs are ratios, the waist that reaches them depends on your hips: 0.90 × hips for men and 0.85 × hips for women. A waist below the figure in the table keeps the ratio under the cut-off. All values are in inches.

Multiply by 2.54 for centimeters: on 40-inch (101.6 cm) hips, a woman reaches the 0.85 cut-off at a 34-inch (86.4 cm) waist. Keep the separate WHO waist cut-offs in mind too: a waist over 102 cm (40 in) for men or 88 cm (34.6 in) for women is flagged as substantially increased risk no matter how wide the hips are.

How to measure accurately

Measurement technique changes the result more than people expect. The WHO protocol is: stand upright with your arms relaxed and feet together, measure the waist midway between the lower edge of your lowest rib and the top of your hip bone (iliac crest) at the end of a normal breath out, and measure the hips around the widest part of the buttocks. Use a tape that does not stretch, keep it level, and keep it snug without squeezing. The US NIH and NHANES protocols measure the waist at the top of the hip bone instead, so pick one method and use it every time you compare.

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. Running the same body through both our BMI Calculator and this WHR tool gives a more complete snapshot than either number on its own, and pairing them with the Body Fat Calculator adds a third dimension: how much of your weight is actually fat.

How to use this calculator

You only need two measurements and your sex to get a result. Work through the fields in order:

1. Pick your unit: choose inches or centimeters. Values you already typed are converted when you switch, and the ratio comes out the same either way.
2. Enter your waist: measure midway between your lowest rib and the top of your hip bone, at the end of a normal breath out.
3. Enter your hips: measure around the widest part of your buttocks, keeping the tape level all the way around.
4. Select your sex: this tells the calculator which WHO cut-off to apply: 0.90 for men or 0.85 for women.

The result updates instantly. Read your ratio first, then whether it is below or at the WHO cut-off, and check the waist at which your ratio would cross it. The breakdown also compares your waist alone with the WHO waist cut-offs.

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, just below the WHO cut-off of 0.85 for women. If she trims her waist by an inch to 31 while her hips stay at 38, the ratio falls to about 0.82, with more room below the line. The same arithmetic works in centimeters: an 81 cm waist and 96 cm hips give 81 ÷ 96 = 0.84, the same answer. Her 32-inch (81.3 cm) waist is also just above the WHO waist cut-off of 80 cm for increased risk in women, which shows why it helps to read both numbers.

How to calculate WHR step by step

Here is that same example worked out one line at a time, so you can follow the exact arithmetic behind the result:

Step 6 is the useful part: at a 32-inch waist she is only 0.3 inches from the 0.85 cut-off, so the waist, not total weight, is where the headroom comes from.

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, since 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 cut-offs.
• 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 losing abdominal fat. The basics are the same as for any fat loss:

• A modest calorie deficit: steady fat loss shrinks the waist over time; the Calorie Deficit Calculator helps you size it.
• Regular physical activity: the federal guidelines call for at least 150 minutes of moderate activity a week plus muscle-strengthening on 2 days.
• Strength training: building or keeping muscle supports a healthier body composition as you lose fat.
• Fewer calorie-dense drinks and snacks: sugary drinks and alcohol are easy to overconsume and add up quickly.

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.

The WHO cut-offs at a glance

It helps to see the ratio and the waist cut-offs side by side, because the WHO table uses both:

• Waist-to-hip ratio of 0.90 or more (men) or 0.85 or more (women): substantially increased risk of metabolic complications.
• Waist over 94 cm / 37 in (men) or 80 cm / 31.5 in (women): increased risk.
• Waist over 102 cm / 40 in (men) or 88 cm / 34.6 in (women): substantially increased risk. The NIH uses the same lines, rounded to 40 and 35 inches.

Treat a cut-off as a signal, not a verdict: someone at 0.84 and someone at 0.70 are both below the women's line but have very different headroom, and a reading a hundredth over the line on one tense morning means less than the trend over several weeks.

WHR, waist circumference, and waist-to-height: which to use

Waist-to-hip ratio is one of three closely related ways to screen for abdominal fat, and each has a niche:

• Waist-to-hip ratio (WHR): compares waist to hips, so it captures the shape of your fat distribution, apple versus pear. Its weakness is that it needs two measurements, and the hip figure adds a second chance for tape error.
• Waist circumference alone: a single number with its own WHO cut-offs (over 94 and 102 cm for men, over 80 and 88 cm for women). The WHO consultation favored it over WHR because it is easier to measure, but it does not account for body size.
• Waist-to-height ratio (WHtR): compares your waist to your height, with the "keep your waist under half your height" rule of thumb. The 2008 WHO consultation found too little data at the time to give it priority; you can check it with the Waist-to-Height Ratio Calculator.

None of these replaces a clinical assessment, and they often agree with each other. WHR earns its place when the apple-versus-pear distinction matters, for example two people with identical waists but very different hip builds. If you mainly want a quick, single-tape check, waist circumference or waist-to-height is simpler; if you want to see how your weight and height interact instead, the BMI Calculator covers that angle.

Why abdominal fat carries more risk

The reason WHR matters at all comes down to where fat sits, not just how much there is. Fat stored deep in the abdomen, around the liver, pancreas and intestines, is called visceral fat. Unlike the subcutaneous fat under the skin of your hips and thighs, visceral fat is metabolically active: it releases fatty acids and inflammatory signals directly into the bloodstream that feeds the liver. Over time this is associated with insulin resistance, higher blood pressure, unhealthy cholesterol patterns, and a raised risk of type 2 diabetes and heart disease. A high waist-to-hip ratio is a low-cost, tape-measure proxy for carrying more of this riskier fat, which is why public-health bodies use it as a screen even though it cannot measure visceral fat directly. It also explains why the waist does most of the moving when your ratio improves: losing visceral fat tends to shrink the waistline first, while the hip measurement, made up largely of subcutaneous fat and muscle, changes much more slowly.

Reading your result over time, not as a one-off

A single waist-to-hip ratio is a snapshot, and snapshots are noisy. Your waist can read differently in the morning versus after a large meal, when you are well hydrated versus dehydrated, or simply if the tape sits a half-inch higher than last time. The signal you actually care about is the trend. Measure under the same conditions (same tape, same two spots, after a normal breath out, ideally first thing in the morning) and log the number every two to four weeks rather than daily. Over a month or two, a falling ratio is meaningful even if any single reading wobbles. This is also why crossing a WHO threshold by a hundredth or two should prompt a closer look at the trend rather than alarm: if you have been steadily improving and happen to read 0.85 on one tense morning, the direction of travel tells you more than the decimal. Pair the trend with how your clothes fit and, when you can, a professional measurement, and you will get far more out of the number than treating each reading as a pass-or-fail test.

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.
• To plan the fat loss that actually moves your waist, estimate your daily energy needs with the TDEE Calculator and size a sensible gap with the Calorie Deficit Calculator.

Used together, these give a fuller picture than any single number: total weight, fat percentage, where that fat is distributed, and the energy budget you need to change it.

Sources

• World Health Organization (WHO): Waist Circumference and Waist-Hip Ratio: Report of a WHO Expert Consultation, Geneva, 8 to 11 December 2008 (published 2011; cut-offs in Annex A, Table A1; measuring protocol in section 5.2).
• National Heart, Lung, and Blood Institute (NHLBI): Aim for a Healthy Weight (waist measured just above the hip bones; risk rises above 35 inches for women and 40 inches for men).
• Centers for Disease Control and Prevention (CDC): Adult Activity: An Overview (150 minutes a week plus 2 days of muscle strengthening).