Waist-to-hip ratio compares the circumference of the waist to the circumference of the hips. It is used as a simple proxy for fat distribution pattern — specifically, how much fat is stored around the abdomen relative to the hips and thighs.
Why distribution matters, not just total fat
Two people with identical body fat percentage can have very different waist-to-hip ratios, because fat distribution pattern varies independently of total fat amount. Abdominal (visceral) fat, stored around internal organs, is associated with different metabolic risk than fat stored subcutaneously around the hips and thighs. This is the reason waist-to-hip ratio is studied as a health indicator separate from BMI or total body fat percentage — it is capturing where fat sits, not how much there is overall.
WHO reference thresholds
| Sex | Low risk | Moderate risk | High risk |
|---|---|---|---|
| Male | Below 0.90 | 0.90–0.99 | 1.0 or above |
| Female | Below 0.80 | 0.80–0.84 | 0.85 or above |
These thresholds come from population studies associating waist-to-hip ratio with cardiometabolic risk factors. They describe a statistical association across large populations, not a diagnostic cutoff for any individual.
Measurement consistency
Waist is measured at the narrowest point of the torso, typically near the navel; hip is measured at the widest point around the buttocks. As with any circumference measurement, small inconsistencies in exactly where the tape sits shift the result — measuring in the same location, at the same time of day (ideally not right after a meal), gives the most consistent comparison over time.
What this ratio does not capture
Waist-to-hip ratio says nothing about muscle mass, overall fitness, or any factor beyond the relative proportion of two circumference measurements. It is one data point among many used in population health research, not a standalone health assessment, and should be interpreted alongside — not instead of — other measurements and, where relevant, a conversation with a healthcare professional.