Waist-to-Height Ratio Calculator
The waist-to-height ratio (WHtR) is a simple, quick indicator of cardiometabolic risk: you divide your waist circumference by your height, both in the same units. Because it accounts for central (abdominal) fat, many studies find it a better predictor of health risk than body mass index (BMI) alone. The widely used rule of thumb is to "keep your waist to less than half your height" — a ratio below 0.5 is generally considered healthy for most adults.
Waist-to-height ratio
Category
This is a general guide, not a diagnosis. Consult a healthcare professional for an individual assessment.
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How it works
The formula is simply waist ÷ height, using the same units for both (for example, centimetres). Interpretation bands: below 0.4 may indicate underweight; 0.4 to under 0.5 is considered healthy; 0.5 to under 0.6 signals increased risk; 0.6 and above signals high risk. For example, a waist of 80 cm and a height of 175 cm gives 80 ÷ 175 ≈ 0.46, which falls in the healthy range.
How to read your waist-to-height ratio
The result falls into four simple bands that are the same for men and women. The core idea is to keep your waist below half your height — a ratio under 0.5. This table shows the ranges and what each one suggests; remember it is a screening guide, not a diagnosis.
| Ratio | Category | What it suggests |
|---|---|---|
| Below 0.4 | Low | Possible underweight; worth reviewing |
| 0.4 to 0.49 | Healthy | Recommended range for most adults |
| 0.5 to 0.59 | Increased risk | Excess abdominal fat; worth acting on |
| 0.6 or above | High risk | Elevated cardiometabolic risk |
Why WHtR can predict risk better than BMI
BMI relates weight to height, but it does not tell you where fat is stored or separate muscle from fat. The waist-to-height ratio measures central or visceral fat directly — the fat around the abdominal organs, which is more strongly linked to heart disease, high blood pressure and type 2 diabetes. That is why several studies find it anticipates cardiometabolic risk at least as well as BMI. To measure your waist correctly, use a soft tape around the narrowest part of your torso, just above the belly button, keep it horizontal and snug without compressing the skin, stand relaxed, and take the reading at the end of a normal breath out.
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Preguntas frecuentes
- What is the waist-to-height ratio (WHtR)?
- It is your waist circumference divided by your height, using the same unit for both. It is a quick screening tool for central obesity and cardiometabolic risk. The simplest guideline is that your waist should be less than half your height, i.e. a ratio below 0.5.
- How do I measure my waist correctly?
- Measure around the narrowest part of your torso, usually just above the belly button, with a soft tape measure. Keep the tape horizontal and snug but not compressing the skin, stand relaxed, and measure at the end of a normal breath out.
- Is the waist-to-height ratio better than BMI?
- For many people it is a useful complement to BMI. Because it captures abdominal fat — which is more strongly linked to heart disease and type 2 diabetes — several studies find it predicts cardiometabolic risk at least as well as, and sometimes better than, BMI. Using both together gives a fuller picture.
- What ratio is considered healthy?
- For most adults a ratio between 0.4 and just under 0.5 is considered healthy. From 0.5 to under 0.6 indicates increased risk, and 0.6 or above indicates high risk. A value below 0.4 may suggest underweight and is worth discussing with a professional.
- Does this ratio work for everyone?
- The 0.5 threshold is a general guide for most adults but is not a diagnosis. It may be less accurate for children, pregnant people, athletes with very high muscle mass, or certain body types. Treat the result as a starting point and consult a healthcare professional for an individual assessment.