Comprehensive Calculator Guide
The waist-to-height ratio divides your waist by your height, and the guide is simple: keep your waist under half your height, a ratio below 0.5. At 175 cm tall with an 85 cm waist the ratio is 0.49 and the waist limit is 87.5 cm. The same threshold applies to men and women.
Why height, and how to read it
Dividing by height makes waist sizes comparable between short and tall people. UK NICE guidance recommends the measure for adults alongside BMI, since it reflects abdominal fat directly.
Roughly, 0.4 to under 0.5 is healthy, 0.5 to under 0.6 means increased risk, and 0.6 or more high risk. These are adult guides; they do not apply in pregnancy, and children use different charts.
How to Use
- 01Enter your waist, measured midway between the lowest rib and the hip bone.
- 02Enter your height.
- 03Read the ratio and your healthy waist limit.
Formula Used
Ratio = waist ÷ height | Healthy waist limit = height × 0.5Practical Examples
Example 1
Waist 85 cm, height 175 cm: 0.49; limit 87.5 cm.
Example 2
Waist 100 cm, height 170 cm: 0.59; limit 85 cm.
Important Tips
- Measure in the morning before eating.
Common Mistakes to Avoid
- Measuring at the trouser line instead of the proper point.
Frequently Asked Questions
- What is a healthy waist-to-height ratio?
- Below 0.5 for adults.
- Is it the same for men and women?
- Yes.
- How do I calculate it?
- Divide waist by height in the same unit.