Waist-to-Height Ratio Calculator
Calculate your waist-to-height ratio (WHtR) — a simple cardiovascular risk screening tool.
How to use this tool
- Enter waist circumference and height in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your whtr and the full breakdown beneath it.
Keep your waist circumference to less than half your height — that simple rule summarises waist-to-height ratio, a reliable cardiovascular risk marker.
⚠ This tool is for general information and education only and is not medical advice. Consult a qualified healthcare professional before making health decisions.
Formula
WHtR = waist circumference (cm) ÷ height (cm)
Categories: < 0.40 Slim, 0.40–0.49 Healthy, 0.50–0.59 Overweight, ≥ 0.60 Very overweight.
How it works
The waist-to-height ratio expresses waist circumference as a fraction of total height, providing a simple index of abdominal adiposity that adjusts for body size. Because it scales with height, a single threshold of 0.50 ("keep your waist to less than half your height") is often cited as a universal screening cut-off. The four-band classification used here gives additional resolution for slim and very overweight categories.
Worked example
- Waist = 80 cm, Height = 175 cm.
- WHtR = 80 ÷ 175 = 0.4571… ≈ 0.46.
- A ratio of 0.46 falls between 0.40 and 0.50, placing it in the Healthy category.
WHtR = 0.46 — Category: Healthy
Common mistakes to avoid
- Measuring waist circumference while exhaling fully rather than at normal relaxed breath, which artificially lowers the waist measurement and the resulting WHtR.
- Entering waist and height in different units — both must be in the same unit (both cm or both inches) because WHtR is a ratio.
- Applying adult WHtR thresholds to children — the same cutoffs are sometimes used, but evidence for pediatric interpretation of WHtR is less settled than for adults.
Key terms
- WHtR
- Waist-to-height ratio; waist circumference divided by height, both in the same unit.
- Abdominal adiposity
- Excess fat stored in and around the abdomen, a risk factor for metabolic and cardiovascular disease.
- Screening tool
- A quick, non-invasive measurement used to identify individuals who may be at elevated health risk and should receive further assessment.
- Half-your-height rule
- The widely cited guideline that WHtR should stay below 0.50, meaning waist circumference should be less than half of height.
- Body size adjustment
- WHtR corrects for the fact that taller people naturally have larger waists, making it more comparable across heights than a raw waist measurement.
Frequently asked questions
- What is a healthy waist-to-height ratio?
- A WHtR below 0.5 is generally considered healthy for both men and women. Research shows WHtR is a better predictor of heart disease risk than BMI alone.
- How does WHtR compare to BMI?
- WHtR captures abdominal fat distribution, which BMI ignores. A person can have a normal BMI but still carry excess belly fat — WHtR catches this.