Waist to Hip Ratio Calculator
Free waist-to-hip ratio calculator. Compute WHR and check it against WHO risk bands for men and women. No signup.
Waist-to-hip ratio and what it flags
The calculator divides your waist circumference by your hip circumference and maps the result to a risk band. A higher ratio means more fat is stored around the abdomen, the pattern most strongly linked to cardiovascular and metabolic problems.
How the ratio and bands work
The math is a single division:
Waist-to-hip ratio = waist circumference ÷ hip circumference
The result is then compared with World Health Organization cut-offs that differ by sex. Men use 0.90 and 0.99 as boundaries; women use 0.80 and 0.85. Below the first boundary is low risk, between the two is moderate risk, and above the second is high risk.
| Sex | Low risk | Moderate risk | High risk |
|---|---|---|---|
| Men | below 0.90 | 0.90 – 0.98 | 0.99 and above |
| Women | below 0.80 | 0.80 – 0.84 | 0.85 and above |
Women have tighter thresholds because a given amount of abdominal fat carries a higher relative risk at smaller waist sizes.
Worked example with the default inputs
The tool opens as male, waist 34 in, hip 40 in.
- Ratio = 34 ÷ 40 = 0.85
- 0.85 is below the 0.90 boundary for men, so the band is Low risk
Switch sex to female while keeping the same measurements and the same 0.85 now sits at the top of the women’s scale, which lands in the High risk band. Same body, different thresholds, different label.
Measuring consistently
Stand relaxed, breathing normally, and take the waist at its narrowest point — usually just above the navel, not across it. Measure the hips at the widest point over the buttocks. Keep the tape flat against bare skin and level all the way around; a tape that rides up at the back adds a phantom inch. Take each measurement twice and use the average.
Common mistakes
- Measuring the waist at the navel. For most people the narrowest point sits higher, and the wrong landmark changes the band.
- Pulling the tape tight. A compressed reading shrinks the waist and flatters the ratio.
- Comparing without the right cut-offs. A 0.85 ratio is low risk for a man and high risk for a woman.
- Treating one reading as a verdict. The ratio is a screening signal, not a diagnosis.
What the ratio adds that BMI cannot
BMI uses only height and weight, so it cannot tell where fat sits. Two people with identical BMIs can have very different risk profiles if one carries fat at the waist and the other at the hips and thighs. Waist-to-hip ratio captures that distribution. It is still a single screen: pair it with blood pressure, cholesterol, and a clinical assessment rather than reading it in isolation.
Is waist-to-hip ratio better than waist circumference alone?
Both reflect abdominal fat. Waist circumference is simpler and is often preferred in clinical settings, while the ratio adds your frame into the equation. They rarely disagree enough to change the broad risk picture, so use whichever you can measure consistently.
Can the ratio change without weight loss?
Yes. Waist size responds to fat loss around the middle, so the ratio can improve even when scale weight barely moves. Resistance training can also shift the ratio downward by preserving hip and thigh muscle while the waist shrinks.
What is a healthy waist circumference on its own?
Waist circumference is the simpler abdominal measure. Commonly cited thresholds are 94 cm (37 in) for men and 80 cm (31.5 in) for women. This calculator reports the ratio instead, but the two usually tell the same story about abdominal fat.
Does age change the interpretation?
The WHO cut-offs applied here do not vary by age; they are fixed by sex. Risk at any given ratio does tend to rise with age, so the bands are a starting reference rather than a personalised risk score.
Does the calculator work in centimetres?
The inputs are labelled in inches, but the ratio is unitless, so you can convert your centimetre measurements to inches first, or enter centimetres in both fields and read the ratio — as long as both use the same unit.
This is an estimate, not medical advice. Bring a high result to a doctor. For the distribution picture alongside total mass, the BMI calculator and body fat calculator fill in the rest. To act on a result, the TDEE calculator gives the maintenance calories a modest deficit is built from.