By Dr. Ajit Kumar, MD (Medicine) — Founder, Medimadad. About the Author | Editorial Policy
Waist-to-height ratio measures central (abdominal) fat, which research links more closely to cardiometabolic risk than BMI alone. The widely-cited target is keeping your waist circumference below half your height — a ratio under 0.5.
Waist-to-Height Ratio Calculator
Measure your waist at the midpoint between your lowest rib and the top of your hip bone, after breathing out normally. This is a screening estimate, not a diagnosis - consult a healthcare professional for a full assessment.
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Frequently Asked Questions
What does the 0.5 threshold mean?
A waist-to-height ratio at or above 0.5 (waist circumference at least half your height) is associated with increased risk of cardiovascular disease, type 2 diabetes, and other metabolic conditions. Keeping the ratio below 0.5 is a widely cited target across both sexes and different ethnic groups.
How is this different from BMI?
BMI only considers total weight relative to height and cannot tell where fat is distributed. Waist-to-height ratio specifically reflects abdominal (central) fat, which research links more closely to cardiometabolic risk. Some studies have found it identifies risk better than BMI in people with a normal BMI but higher abdominal fat, sometimes called normal-weight obesity.
Does this apply the same way to men and women?
Yes. Unlike some measures that use different considerations by sex, the 0.5 waist-to-height ratio threshold has been validated as applicable to both men and women, and across different ethnic populations, making it a broadly consistent screening tool.
How do I measure my waist correctly?
Measure around your waist at the midpoint between your lowest rib and the top of your hip bone, usually near the navel, after breathing out normally. Measuring right after a large meal or while flexing your stomach can distort the result.
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