Health Formula • Published on September 01, 2026 • Last updated September 01, 2026
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Measured at the navel, in the same unit as height
Standing height, in the same unit as waist circumference
Waist-to-Height Ratio is a simple screening tool for central obesity, based on the guideline of keeping your waist circumference below half your height. Unlike BMI or Waist-to-Hip Ratio, it doesn't require separate male/female cutoffs, making it a more universally applicable single-threshold measure of cardiometabolic risk across genders, ages, and even ethnicities.
Research by Margaret Ashwell and others found that a waist-to-height ratio below 0.5 is associated with substantially lower cardiometabolic risk across a wide range of ages, heights, and ethnic groups, making it a simple, memorable public health message.
Several studies suggest WHtR may be a better predictor of cardiovascular and diabetes risk than BMI because it specifically reflects abdominal fat, which is more metabolically harmful than fat stored elsewhere, whereas BMI cannot distinguish where fat is distributed.
Plain-language explainers that sit next to this tool.
Learn the simple waist-to-height ratio formula, the "keep your waist under half your height" rule, why it can flag abdominal fat risk that BMI misses, and how it compares to waist-to-hip ratio.
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