Body composition calculator
Waist-to-height ratio
A simple, better-than-BMI screen for central fat: keep your waist under half your height. Free, instant, no sign-up.
Track this number — the trend says more than today's reading.
Free — no card, 30 seconds. Your result comes with you.
Why is waist-to-height ratio better than BMI?
Waist-to-height ratio (WHtR) captures where your fat sits, not just how much you weigh. Fat around the waist is the kind most linked to cardiometabolic risk, which is why WHtR often predicts that risk better than BMI does.
How does this calculator work?
We divide your waist circumference by your height — same unit on both, so the ratio is unit-free. The simple guideline: under 0.5 is healthy, 0.5–0.6 is increased risk, and 0.6 or above is high risk. "Keep your waist under half your height."
Where exactly do you measure your waist?
Measure around the narrowest point, usually just above the navel, relaxed and without sucking in. Waist is one of the most responsive numbers to a sensible deficit and consistent training. Want a plan to move it in the right direction? That's what the coach is for.