Waist-to-Height Ratio Calculator
The waist-to-height ratio is a simple, strong health screen: keep your waist under half your height (a ratio below 0.5). Enter your measurements to check.
Where you land
\ud83c\udf4f Simple steps to a healthier waist
Learn moreKeep your waist under half your height
The waist-to-height ratio boils a key health signal down to one memorable rule: keep your waist to less than half your height. Research finds it predicts cardiometabolic risk at least as well as BMI, and it works across ages and body types because it scales to your frame. A ratio at or above 0.5 is a prompt to act; 0.6+ signals higher risk.
How it’s calculated & sources
Ratio = waist circumference divided by height (same units). The primary threshold is 0.5 (waist less than half your height), with 0.5 to 0.6 increased and 0.6+ high risk.
Benchmark: the waist less than half your height guideline (ratio below 0.5), endorsed by UK NICE guidance as a simple health screen.
Results update as you type and are general estimates, not personalized advice. Verify with a professional.
Worked example
A 32-inch waist at 68 inches tall is a ratio of 0.47 — under the 0.5 threshold (half of 68 inches is 34 inches), in the healthy range.
Frequently asked questions
Why is 0.5 the cutoff?
Because a waist under half your height corresponds to lower cardiometabolic risk across most adults, regardless of overall height.
Is it better than BMI?
It captures central fat that BMI misses and predicts risk at least as well; many clinicians use it alongside BMI.
Where do I measure my waist?
Midway between the lowest rib and the top of the hip bone (roughly at the navel), tape level and snug.