Waist-To-Height Ratio Calculator
Compare waist with height on a clear 0.5 reference rail using NICE central-adiposity guidance.
What Is the Waist-To-Height Ratio Calculator?
The Waist-To-Height Ratio Calculator divides waist circumference by height using matching units and places the result on a visible 0.5 reference rail. It reports waist as a percentage of height, the half-height measurement and the difference from that reference using NICE central-adiposity guidance.
How It Works
Measure waist midway between the bottom of the ribs and top of the hips after breathing out naturally. Enter waist and height in US or metric units, then review the ratio, reference rail and exportable worksheet.
When to Use It
Use it as one screening measurement alongside broader health context, not as a diagnosis or direct body-fat measurement. NICE notes limitations for children, pregnancy, eating disorders, growth conditions and adults with BMI above 35.
Frequently Asked Questions
- What Does The 0.5 Reference Mean?
- A ratio below 0.5 means the entered waist is less than half the entered height. NICE uses 0.50 to 0.59 for increased and 0.60 or more for high central adiposity in the populations covered by its guidance.
- Do The Units Matter?
- Waist and height must use the same unit. The tool converts both together when you switch between US and metric.
Found an issue? Send Feedback. See our data sources and update policy for tools that depend on changing information.