Waist-to-Height Ratio Calculator
Calculate your waist-to-height ratio (WHtR) and assess health risk.
Enter both measurements in the same unit. WHtR is a unitless ratio.
Measure at navel level
Waist-to-Height Ratio
Category
Healthy Waist Threshold
What the Waist-to-Height Ratio Measures
The waist-to-height ratio (WHtR) divides your waist circumference by your height, using the same unit for both so the result is a simple unitless number. It is a proxy for central (abdominal) fat — the fat stored around your organs that is most strongly linked to cardiovascular and metabolic risk. Because the body proportions of taller and shorter people differ, dividing waist by height normalizes the measurement and makes it comparable across people of different statures.
A widely used public-health message is to keep your waist circumference to less than half your height — in other words, a WHtR below 0.5.
Why WHtR Can Beat BMI and Waist-to-Hip Ratio
Body Mass Index (BMI) uses only weight and height, so it cannot tell the difference between fat and muscle, nor can it locate where fat is stored. A muscular person can be flagged as overweight, while someone with a normal BMI may still carry harmful abdominal fat. WHtR directly targets central fat, which research links more closely to health outcomes.
The waist-to-hip ratio (WHR) also captures central fat, but it requires an accurate hip measurement and uses a single fixed threshold that ignores body height. WHtR needs just two easy measurements, scales naturally with stature, and uses one memorable benchmark — keep it below 0.5 — for adults of all heights.
WHtR Categories and Thresholds
These general adult thresholds are commonly used to interpret WHtR. They are guidance, not a diagnosis, and the same number applies regardless of the unit you measured in.
| WHtR | Category |
|---|---|
| Below 0.40 | Slim / take care (underweight signal) |
| 0.40 – 0.49 | Healthy |
| 0.50 – 0.59 | Increased risk |
| 0.60 and above | High risk |
Note: This calculator provides a general screening estimate based on commonly cited WHtR thresholds and is not a medical diagnosis. The thresholds are intended for adults and may not apply to children, pregnant individuals, athletes, or specific ethnic groups, who can have different cut-offs. A single measurement cannot capture overall health. Always consult a qualified healthcare professional before making decisions about your health.