Waist-to-height ratio: a simple health check that beats BMI
Body mass index only compares weight with height, so it cannot tell muscle from fat or show where fat is stored. The waist-to-height ratio adds that missing piece. You divide your waist circumference by your height, using the same units. A value below 0.5, meaning your waist is less than half your height, is linked with lower risk of type 2 diabetes, high blood pressure and heart disease in adults of most ages and backgrounds.
The reason it works is that the waist reflects visceral fat, the fat stored deep in the abdomen around the organs. This type of fat is more metabolically active and more strongly connected with insulin resistance and inflammation than fat stored under the skin on the hips or thighs. Two people with the same BMI can carry very different amounts of visceral fat, and the tape measure picks that up where the scale cannot. For muscular people, it also avoids the problem of being labelled overweight because of muscle.
Check your BMI — and what it does and doesn't say about you — with our free calculator.
Calculate my BMITo measure, stand relaxed, breathe out normally and wrap the tape around your waist halfway between the lowest rib and the top of the hip bone, keeping it level and snug but not tight. Measure at the same time of day, ideally in the morning, and check every few weeks rather than daily. A ratio from 0.5 to 0.6 suggests increased risk worth acting on through training, diet and sleep; above 0.6 it is worth discussing with a doctor.
More articles
Save your progress and get an AI coach plan. Start with a free workout log right now — no signup needed; create a free account when you want to keep your history.
Start a free workout