About the waist-to-height ratio calculator
Waist-to-height ratio divides waist circumference by height. A commonly cited guideline for adults is to keep waist size below half of height (a ratio under 0.5). It is a screening measure, not a diagnosis, and works with any units as long as both measurements match.
How to use this calculator
- Measure your waist.
- Enter your height in the same system.
- Read the ratio.
Worked examples
- 34 ÷ 70 = 0.49
Ratio 0.49.
Measurement guidance
Measuring waist
Measure halfway between the lowest rib and the top of the hip bone, after breathing out normally.
Frequently asked questions
What is a healthy ratio?
A ratio below 0.5 is a commonly cited adult guideline; discuss results with a healthcare professional.
Does it work in metric?
Yes, as long as both measurements use the same unit.
Is this medical advice?
No.