Waist-to-Hip Ratio Calculator
Enter your waist and hip measurements to calculate your waist-to-hip ratio and see your risk category using WHO thresholds.
How waist-to-hip ratio is calculated
Waist-to-hip ratio estimates where your body carries fat, which matters for health risk independently of total body weight. The World Health Organization sets separate risk thresholds for men and women, since typical fat distribution differs by sex.
Ratio: 34 ÷ 40 = 0.85 — right at the WHO threshold for women (below 0.85 is considered lower risk), and below the male threshold of 0.90.
Ratio: 42 ÷ 38 = 1.11. For a male, that's well above the 0.90 WHO threshold, landing in the "Higher risk" category — a clear "apple-shaped" pattern, since the waist measurement is larger than the hip measurement.
Compare this to the first example (0.85, a "pear-shaped" pattern where hips exceed waist): the two people could have identical total body weight, yet the WHO categorization differs entirely because the ratio captures where fat sits, not how much there is overall.
WHO waist-to-hip ratio categories
| Sex | Lower risk | Higher risk |
|---|---|---|
| Male | Below 0.90 | 0.90 or above |
| Female | Below 0.85 | 0.85 or above |
Why fat distribution matters beyond total weight
Two people with the same weight and even the same BMI can have very different health risk profiles depending on where their body stores fat. Abdominal ("apple-shaped") fat distribution is associated with higher cardiovascular and metabolic risk than hip-and-thigh ("pear-shaped") distribution, which is why waist-to-hip ratio adds information that weight or BMI alone can't capture.
Waist-to-hip ratio vs. waist circumference alone
| Standard | Metric used | Men | Women |
|---|---|---|---|
| WHO waist-to-hip ratio | Waist ÷ hip | 0.90+ = higher risk | 0.85+ = higher risk |
| NIH/ATP III waist circumference | Waist alone | Above 40 in (102 cm) | Above 35 in (88 cm) |
Both are recognized markers of abdominal fat used in different clinical contexts — waist circumference alone is part of the NIH's ATP III metabolic syndrome criteria, while waist-to-hip ratio is the WHO's relative measure. A person can cross one threshold without crossing the other, which is one more reason no single number tells the whole story.
Common mistakes when measuring for waist-to-hip ratio
- Measuring the waist at the belly button instead of the narrowest point. These aren't always the same location — find the true narrowest point of your torso.
- Pulling the tape too tight or too loose. It should be snug against the skin without compressing it.
- Using a single measurement as a diagnosis. This is a screening tool, not a medical diagnosis — discuss results with a healthcare provider if you have concerns.
Frequently asked questions
What is a healthy waist-to-hip ratio?
Below 0.90 for men and below 0.85 for women, per WHO guidelines.
Why does waist-to-hip ratio matter more than weight alone?
Fat distribution affects health risk independently of total weight — abdominal fat carries higher risk than hip/thigh fat at the same weight.
How do I measure my waist and hips correctly?
Waist at the narrowest point (usually above the belly button), hips at the widest point around the buttocks, tape snug but not compressing.
Is waist-to-hip ratio better than BMI?
They measure different things — many health organizations recommend using both together.
How does this differ from waist circumference alone?
Waist circumference alone (used in NIH/ATP III criteria) is an absolute measurement; waist-to-hip ratio is relative, since it also factors in hip size.
Can a low ratio at a high weight still carry risk?
Yes — the ratio describes fat distribution, not total body fat, so a favorable ratio doesn't rule out risk from a high overall BMI or body fat percentage.
Related calculators
Note: This tool is for educational purposes only and does not diagnose any medical condition. Consult a healthcare provider about your health risk. Source: World Health Organization. Last reviewed: September 2026.