How to Calculate Waist-to-Height Ratio: A Step-by-Step Guide
A ratio above 0.5 suggests increased health risk.
Health numbers are most useful when you track them consistently. A quick calculation turns everyday measurements into something you can act on, whether that is planning meals, training for a run or preparing for a clinic visit.
What you need
- Waist (cm)
- Height (cm)
Step by step
- Enter the waist (cm).
- Enter the height (cm).
- The results update as you type, or press Calculate.
- Read the waist-to-height ratio first, then the supporting figures below it.
The formula
Ratio = waist ÷ height.
Worked example
For example, with these inputs:
- Waist (cm): 82
- Height (cm): 170
the calculator returns:
- Waist-to-height ratio: 0.48
A second example
Now change the inputs to:
- Waist (cm): 102
- Height (cm): 170
the calculator returns:
- Waist-to-height ratio: 0.60
Practical tips
- Measure at the same time of day, ideally in the morning, for consistent readings.
- Healthy 365 and wearables give useful data, but treat their calorie figures as approximate.
- Asian BMI cut-offs are lower than WHO's, so a 'normal' international BMI can still mean moderate risk.
- Small, steady changes are easier to sustain than dramatic targets.
Background
Programmes such as the National Steps Challenge and the Healthy 365 app have made tracking activity common. Turning those numbers into distance, pace or calories helps set realistic goals for events like IPPT or a 10 km run.
Any health calculator gives a general estimate. If a result worries you, or you are pregnant, managing a chronic condition or planning a big change in diet or exercise, speak to a doctor, polyclinic or dietitian.
Simple measurements such as weight, height and waist circumference are widely used to screen for health risks because they are cheap and easy to repeat. They are not diagnoses, but tracked over time they show whether lifestyle changes are working.
Related calculations
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- Calorie Deficit Calculator: Sets a daily calorie target for steady weight loss.
- Pregnancy Due Date Calculator: Estimates your due date using Naegele's rule.
- Ovulation Calculator: Estimates ovulation and the fertile window.
Want to skip the arithmetic? The free Waist-to-Height Ratio Calculator does all of this instantly and updates as you type.
Run your own numbers: Waist-to-Height Ratio Calculator