Waist-to-Height & Waist-to-Hip Ratio

WHtR (waist-to-height ratio) = waist circumference / height (same unit).
WHR (waist-to-hip ratio) = waist circumference / hip circumference.

Both are dimensionless. Example: waist 90 cm and height 175 cm → WHtR = 0.51.

WHtR (applies to both sexes):

WHR — increased risk above 0.90 (men) and 0.85 (women) (WHO thresholds). Important: these are screening indicators, not a diagnosis; thresholds can vary by population and age.

Abdominal fat is more closely tied to cardiovascular and metabolic risk than total weight. The WHtR rule of thumb — "keep your waist to less than half your height" — is simple and valid across ages.

For a complete picture pair it with BMI and ideal weight; waist also feeds the metabolic syndrome criteria.

• Waist: standing, at end of expiration, midway between the lowest rib and the iliac crest (often at navel level), without compressing.
• Hips: at the widest point of the buttocks.
• Use a flexible tape, parallel to the floor, and the same unit for waist and height.

Values above the thresholds suggest acting on lifestyle: a balanced diet, regular physical activity and reducing abdominal fat.

When to see a professional: if the ratios indicate increased risk or you have other risk factors, discuss it with your doctor.

• They depend on correct waist measurement, which can vary between people.
• Thresholds can vary by ethnicity and age.
• They do not distinguish subcutaneous from visceral fat.