Two people at the exact same weight can carry meaningfully different health risks depending on where their body stores fat — and waist-to-hip ratio is one of the simplest ways to capture that difference, using nothing more than a tape measure.
Fat stored around the abdomen (often described as "apple-shaped") is more strongly linked to cardiovascular and metabolic health risk than fat stored around the hips and thighs ("pear-shaped"), even at an identical total body weight. This is because abdominal fat sits closer to and around internal organs, where it behaves more metabolically active than fat stored elsewhere on the body.
How Waist-to-Hip Ratio Is Calculated
Waist-to-Hip Ratio = Waist Circumference ÷ Hip Circumference
Measure your waist at its narrowest point (or at the navel if there's no clear narrowing) and your hips at their widest point, both with the tape snug but not compressing skin. General risk thresholds: for men, a ratio above 0.90 is associated with higher risk; for women, above 0.85.
A Worked Example
For a woman with a 32-inch waist and 38-inch hip measurement: Ratio = 32 ÷ 38 ≈ 0.84 — just under the 0.85 threshold, generally categorized as lower risk. For a man with a 38-inch waist and 40-inch hip measurement: Ratio = 38 ÷ 40 = 0.95 — above the 0.90 threshold, generally categorized as higher risk, even if his overall BMI happens to fall in a "normal" range.
Common Mistakes to Avoid
- Measuring inconsistently: use the same landmarks and tape tension every time for the trend to be meaningful over repeated measurements.
- Relying on BMI alone without this additional context: BMI doesn't capture fat distribution at all — waist-to-hip ratio adds a dimension BMI misses entirely.
- Not accounting for natural body frame differences: some variation in ratio reflects normal individual body shape, not necessarily health risk — trends over time matter more than a single measurement in isolation.
- Measuring over bulky clothing: this adds inconsistent bulk — measure directly against skin or thin clothing for an accurate result.
Bottom Line
Where you carry weight matters alongside how much you carry. Use a Waist-to-Hip Ratio Calculator with your own measurements to see your ratio and general risk category.