Waist-to-Hip Ratio Calculator
Work out your waist-to-hip ratio (WHR) from two simple measurements and see the World Health Organization health-risk category for your sex — a quick indicator of fat distribution.
What waist-to-hip ratio tells you
Waist-to-hip ratio (WHR) compares the size of your waist to the size of your hips, giving a simple number that reflects where your body stores fat rather than how much you weigh overall. Fat carried around the abdomen — including the visceral fat packed around internal organs — is more strongly linked to cardiovascular and metabolic risk than fat carried on the hips and thighs. A higher ratio (an “apple” shape) signals more central fat; a lower ratio (a “pear” shape) signals fat carried lower down.
What WHR doesn’t do is measure total body fat or diagnose any condition. It’s a screening signal about fat distribution that complements BMI rather than replacing it. A single reading is just a snapshot, and the WHO thresholds are population averages, so treat your number as a prompt to look closer, not a conclusion.
How to use this calculator
Measure your waist at its narrowest point — usually just above the navel — and your hips at the widest part of your buttocks, then enter both along with your sex. Keep the tape snug and level, stand relaxed, breathe out normally and don’t suck in. The units don’t matter as long as both measurements use the same one, because the calculator simply divides one by the other.
How it’s calculated
The formula is straightforward: WHR = waist circumference ÷ hip circumference. Because it’s a ratio of two lengths, the units cancel out — centimetres or inches both work — so the result is the same regardless of measurement system. The calculator then compares your ratio against the World Health Organization’s sex-specific risk bands and tells you which one you fall into.
A worked example
Suppose a woman measures an 80 cm waist and 100 cm hips. Her WHR is 80 ÷ 100 = 0.80, which sits in the lower-risk band for women (0.85 or below). If her waist crept up to 90 cm with the same hips, the ratio would rise to 0.90 — moving her into the higher-risk band and flagging more central fat, even if her overall weight had barely changed.
WHO health-risk categories by sex
| Risk level | Men | Women |
|---|---|---|
| Lower risk | 0.90 or below | 0.85 or below |
| Moderate risk | 0.91 – 0.99 | 0.86 – 0.89 |
| Higher risk | 1.0 or above | 0.90 or above |
WHR vs waist-to-height vs BMI
These three measures answer different questions, which is why they’re often used together. BMI gauges overall weight relative to height but says nothing about fat distribution. WHR captures distribution but can be skewed by wide or narrow hips. Waist-to-height ratio (waist ÷ height, with “keep your waist under half your height” as a common rule of thumb) focuses purely on central fat and many researchers consider it a particularly simple, robust risk indicator. No single number is definitive; looking at two or three gives a fuller picture.
Limitations & tips
WHR depends heavily on consistent measuring — placing the tape differently or pulling it tight can shift the result enough to change your category, so measure two or three times and average. The hip measurement also means very broad or very narrow hips can move the ratio for reasons unrelated to abdominal fat. The WHO bands are general adult guidance and don’t apply to children, and pregnancy makes waist measures meaningless. Above all, WHR is a screening tool, not a diagnosis: it can flag elevated risk patterns but can’t confirm a health problem. Pair it with other measures and bring any concerns to a healthcare professional.
Frequently asked questions
What is a healthy waist-to-hip ratio?
The WHO considers lower risk to be a ratio at or below 0.90 for men and 0.85 for women. Higher ratios indicate more abdominal fat and are linked to greater cardiovascular and metabolic risk.
How do I measure waist and hips?
Measure your waist at the narrowest point (usually just above the navel) and your hips at the widest part of your buttocks. Keep the tape snug and level, and don't hold your breath or suck in.
Is WHR better than BMI?
They measure different things. BMI estimates overall weight relative to height; WHR captures fat distribution. Used together they give a fuller picture of health risk than either alone, since you can have a normal BMI but a high WHR if you carry fat centrally.
What does a high waist-to-hip ratio indicate?
It suggests you carry relatively more fat around your abdomen, including visceral fat around the organs. That central fat pattern is associated with greater risk of cardiovascular disease, type 2 diabetes and other metabolic conditions than fat stored on the hips and thighs. It’s a risk signal worth acting on, not a diagnosis of disease.
How is WHR different from waist-to-height ratio?
WHR divides waist by hips, while waist-to-height ratio divides waist by height. Waist-to-height focuses purely on central fat and isn’t affected by hip width, and a common rule of thumb is to keep your waist under half your height. Many researchers regard it as an especially simple and reliable risk indicator, so some people track both.
Does WHR apply to everyone?
No. The standard thresholds are for non-pregnant adults and don’t apply to children, who are assessed differently. Pregnancy makes waist measurements meaningless, and very athletic or unusually proportioned people may not fit the averages neatly. If any of these apply to you, interpret the result cautiously and seek individual advice.
How often should I measure?
For tracking change, every few weeks to a couple of months is plenty — fat distribution shifts slowly. Always measure under the same conditions: same time of day, relaxed posture, tape in the same spot, after a normal breath out. Watch the trend over time rather than reacting to a single reading, which can vary just from tape placement.
Sources & references
- World Health Organization — Waist circumference and waist–hip ratio: report of a WHO expert consultation — the basis for this tool's sex-specific waist-to-hip risk bands.
- CDC — Healthy weight — explains why abdominal ("central") fat, distinct from BMI, is linked to higher cardiometabolic risk.
Last updated: July 2026 · How we calculate
BriskToolbox provides estimates for general information only and is not medical advice. Talk to a healthcare professional about your individual health.