How to Use the Waist-to-Hip Ratio Calculator
Measure your waist at its narrowest point (usually just above the belly button) and your hips at their widest point, enter both using the same unit, and the calculator divides waist by hip to produce your ratio along with which World Health Organization risk category it falls into for your sex.
Since it's a ratio, the specific unit you measure in doesn't affect the result — only using the same unit for both measurements does.
Measuring accurately
Use a flexible tape measure, keep it snug but not compressing the skin, and measure standing upright — as covered in the same-BMI guide, an inconsistent measurement location (waist measured too high or too low) is a common source of an inaccurate ratio that doesn't reflect your actual body shape.
Reading your risk category
As covered in the WHR-vs-BMI-vs-waist-circumference guide, treat the resulting risk category as one useful data point alongside other measures like BMI, not a standalone diagnosis — a result in a higher-risk category is worth raising with a healthcare provider as part of a broader conversation.