Waist and height
Enter waist size and height; each pair of units stays in sync. WHtR is waist ÷ height (same units). A common guide is to keep waist below half your height.
How waist-to-height ratio works
A simple central fat screen
Waist-to-height ratio (WHtR) divides waist circumference by height using the same units. Because taller people tend to have larger absolute waists, scaling waist by height makes comparisons fairer than waist alone. Researchers often study WHtR as a crude marker of central adiposity alongside BMI.
A widely repeated public-health slogan is to keep your waist less than half your height (WHtR < 0.5). Bands on this page describe that style of guidance; they are not a diagnosis.
Formula
WHtR = waist ÷ height (both in cm, or both in inches — the ratio is unitless if consistent). Example: waist 80 cm, height 170 cm → WHtR = 80 ÷ 170 ≈ 0.47.
How to measure
Measure height without shoes. Measure waist standing, after a normal breath out, roughly midway between the lowest rib and the top of the hip bone, tape parallel to the floor — not over a thick belt or bulky jumper. Consistency matters more than millimetre perfection.
Worked example
Height 175 cm, waist 96 cm → WHtR ≈ 0.55, above the “half height” rule of thumb. The same person with a 84 cm waist has WHtR ≈ 0.48.
Common mistakes
- Mixing cm waist with inches height.
- Measuring at the navel only when clothing pulled the tape askew.
- Using WHtR alone while ignoring blood pressure, lipids, or clinical advice.
FAQs
- How does this differ from BMI?
- BMI uses weight and height; WHtR uses waist and height, so it tracks abdominal size more directly. Compare with BMI & BRI.
- Is 0.5 universal?
- It is a round educational threshold, not a personal medical cut-off for every age and sex.
Related: BMI & BRI, Ideal Weight, BMI guide.
Last updated: July 2026