Waist-to-Height Ratio Calculator
Your WHtR and health risk level
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Waist-to-height ratio (WHtR) divides waist by height. The simple rule is to keep your waist under half your height (WHtR below 0.5). It predicts metabolic risk better than BMI for many people.
How to use this waist-to-height ratio calculator
Enter your waist circumference and your height in the same unit — centimeters or inches — then press calculate. Your waist-to-height ratio appears instantly, along with the risk category it falls into, and no sign-up is required. The math is simply your waist measurement divided by your height, so a 80 cm waist and a 170 cm height give a ratio of about 0.47. Switching units is fine as long as both values use the same one.
How to read your result
The guiding idea is delightfully simple: keep your waist under half your height. A ratio below 0.5 sits in the healthy range for most adults, roughly 0.5 to 0.6 signals increased risk, and anything above 0.6 counts as high risk and is worth acting on. Because it is a proportion, the boundaries stay the same whether you measured in centimeters or inches, which makes it easy to track month to month.
The science behind the numbers
Waist-to-height ratio flags central or visceral fat — the deep abdominal fat wrapped around your organs — and it is that fat which drives much of your cardiometabolic risk. Many large studies report that the simple under-0.5 rule works consistently across ages and ethnicities, and that it often predicts high blood pressure, type 2 diabetes and heart disease better than BMI, which cannot tell where fat sits on your body. This is why several health bodies now recommend it as a quick screen.
Limits and practical tips
For an accurate reading, measure at a consistent spot — the WHO uses the midpoint between your lowest rib and the top of your hip bone — with the tape snug but not compressing the skin, level all the way around, and your abdomen relaxed after a normal breath out. It is not valid during pregnancy. For a fuller picture, pair it with CaloNote's Waist-to-Hip Ratio, BMI and Body Fat calculators, and use the CaloNote app to log your measurements and meals over time.
Frequently Asked Questions
- What is the waist-to-height ratio?
- Waist-to-height ratio (WHtR) divides your waist circumference by your height. It estimates central, abdominal fat, which is more closely tied to health risk than overall weight, and many researchers consider it a better screening tool than BMI alone.
- How do I calculate and measure WHtR correctly?
- Divide waist by height in the same units. Measure your waist at the midpoint between the lowest rib and the top of the hip bone, after a normal exhale, without sucking in. Enter both values and the calculator returns your ratio and risk band.
- What is a healthy waist-to-height ratio?
- A common guideline is to keep your waist less than half your height, so a WHtR under 0.5. Ratios from 0.5 to 0.6 suggest increased risk and above 0.6 indicate high risk, signalling excess abdominal fat worth addressing.