Waist-to-HipRatio

Waist-to-hip ratio is the ratio of your waist circumference to your hip circumference. It is an anthropometric measure, meaning it is derived from simple body measurements rather than from imaging or laboratory tests. Because it compares two circumferences, it describes the relative distribution of fat between the abdomen and the hips and buttocks.

A higher WHR indicates that more of your girth is concentrated around the waist relative to the hips — a pattern associated with central (abdominal) adiposity. A lower WHR indicates that more of your girth sits around the hips. This distribution pattern is one reason WHR is used alongside other measures as a screening indicator for cardiometabolic risk.

The formula is straightforward:

Both measurements use the same unit, so the ratio is unit-independent — a 80 cm waist with a 100 cm hip gives the same 0.80 as a 31.5 in waist with a 39.4 in hip. The calculator above converts imperial inputs to centimetres internally, divides waist by hip, and rounds the result to two decimal places. It then maps your result onto a reference framework based on the sex you select.

Use a flexible, non-stretch tape measure on bare skin. Stand relaxed with your feet together and weight evenly distributed, and do not pull your stomach in — the goal is a resting measurement. Find the midpoint between the bottom of your lowest rib and the top of your hip bone (the iliac crest); for most people this sits roughly level with the navel. Keep the tape horizontal around your torso, snug but not compressing the skin, and take the reading at the end of a normal exhalation. Measure twice and average the two, ideally first thing in the morning before eating.

With the same flexible tape, stand relaxed with feet together and measure around the widest part of your buttocks (hips). This point is usually slightly below the bony hip crests, not at the iliac crest itself. Keep the tape horizontal and parallel to the floor, snug but not compressing the skin. Measure twice and average the results, ideally at the same time of day and with the same tape you used for your waist measurement, so the two readings are directly comparable.

WHR describes the relative balance between abdominal girth and hip girth, which broadly reflects where your body stores fat. A higher ratio points toward a more central, abdominal pattern; a lower ratio points toward a gluteofemoral pattern. This matters because central adiposity — particularly visceral fat stored around the organs — is more metabolically active and more strongly associated with cardiometabolic conditions than fat stored peripherally.

Importantly, WHR describes distribution, not quantity. It does not tell you how much total fat you carry, what percentage of your weight is fat, or how much of that fat is visceral versus subcutaneous. Two people with the same WHR can have very different total body fat and muscle mass.

Waist circumference and WHR are related but distinct measures. Waist circumference is a single absolute measurement of abdominal girth. WHR is a ratio that normalises waist against hip, so it adjusts for differences in overall body frame and hip size.

Because WHR is relative, it can sometimes mask changes in absolute abdominal fat. Someone could lose several centimetres of waist circumference while their hip circumference shrinks proportionally, leaving WHR roughly unchanged. Conversely, two people with the same WHR can have very different waist circumferences. Research indicates that waist circumference provides information that WHR may not fully capture, which is why many guidelines use waist circumference and WHR together rather than interchangeably.

A number of observational studies have found that higher WHR is associated with increased relative risk of cardiovascular disease, type 2 diabetes, and other cardiometabolic conditions, often performing at least as well as BMI and in some populations better. The WHO Expert Consultation on Waist Circumference and Waist–Hip Ratio concluded that WHR is a useful additional measure of body-fat distribution, while noting that cutoffs vary across populations and clinical contexts.

The reference interpretation shown by the calculator uses commonly cited values — a WHR of 0.90 or below for men and 0.80 or below for women as a lower-risk reference point. These are reference values, not universal thresholds or a diagnosis. Cardiometabolic risk is never assessed from a single number: blood pressure, blood lipids, glucose, family history, fitness, and lifestyle all contribute to the full picture.

WHR is a convenient screening estimate, but it has clear limits. Its accuracy depends on careful, consistent measurement technique — tape placement, posture, breathing, and time of day all affect the reading. It does not account for body composition, age, sex beyond the reference cutoffs, pregnancy, bloating, or a heavily muscled core, any of which can shift the ratio without a corresponding change in health.

WHR does not measure body fat percentage or visceral fat directly, and it cannot diagnose any condition. As noted above, waist circumference captures information that WHR alone may miss, so the two are often used together. Treat the result as an approximate screening indicator, and consult a qualified healthcare professional for a comprehensive assessment.