Overview
Waist-to-height ratio compares abdominal fat with body height and can add useful information beyond BMI because it focuses on fat distribution. A common rule is to keep waist below half your height.
Formula
Ratio = waist ÷ height. Example: an 80 cm waist and 170 cm height give 0.47.
How it works
Measure the waist
Stand straight and measure after exhaling, midway between the lowest rib and hip.
Enter height
Use the same unit for both measurements.
Read the ratio
Values between 0.4 and 0.5 are commonly considered healthy; above 0.5 deserves attention.
Worked examples
80 cm waist, 170 cm height
The ratio is 0.47, within the common healthy range.
95 cm waist, 170 cm height
The ratio is 0.56, in the increased-risk range.
Frequently asked questions
What is a healthy ratio?
0.4–0.49 is commonly used as a healthy adult range, with 0.5 as a boundary best not exceeded.
Is it better than BMI?
It is not a replacement, but it adds information about abdominal fat. Using both with other measures is better.
Does it apply to women and men?
Yes, the general adult rule is the same, with allowances for pregnancy and body composition.
Does it apply to children?
Children use different age- and sex-specific references; adult cut-offs are not recommended.
This calculator is for educational and informational purposes only and is not a substitute for professional advice.