Waist to Height Ratio Calculator
Calculate your waist-to-height ratio and see the health band it falls into. Keep your waist under half your height. Free and private.
Independently verified for accuracy
Calculator by Toolsloft ↗- Waist-to-height ratio
- 0.44
- Category
- Healthy
Divide your waist by your height to get the waist-to-height ratio, a simple screen for central fat that works across ages and body types. The rule of thumb is to keep your waist under half your height.
How this is calculated
The ratio is your waist measurement divided by your height in the same unit. Categories use Ashwell's chart boundaries: below 0.4 is unusually low, 0.4 to 0.49 is healthy, 0.5 to 0.59 is increased risk, and 0.6 and above is high risk.
How to use
- Measure your waist at the narrowest point and your height, in the same unit.
- Enter both measurements.
- Read your ratio and the band it falls into.
Examples
- Waist 80, height 180:
0.44, Healthy - Waist 100, height 180:
0.56, Increased risk
FAQ
- What is a healthy waist-to-height ratio?
- A ratio between 0.4 and 0.49 is considered healthy for most adults. The simple guideline is to keep your waist measurement below half your height.
- Why use waist-to-height instead of BMI?
- Waist-to-height ratio captures where you store fat, not just total weight. Because it scales with height, the same 0.5 boundary works for most adults regardless of build, and it flags central fat that BMI can miss.
- Does the unit of measurement matter?
- No, as long as the waist and height use the same unit. The ratio is a division of one by the other, so centimetres over centimetres or inches over inches both give the same number.