Free tool

Waist-to-height ratio

The number that outranks your weight — checked against UK NHS guidance, with honest context.

Waist (cm, at the navel) Height (cm)

Check my ratio

Why this number outranks your weight

Two people at the same weight can carry it completely differently — the scale scores them identically, while central fat, the storage pattern most tied to health risk, hides in the difference. Waist-to-height ratio sees it. UK NHS guidance is simple: try to keep your waist below half your height.

It is also the number that keeps moving when the scale goes flat: in body recomposition — muscle up, fat down, weight unchanged — the waist quietly shrinks through the "plateau".

Measuring it honestly

Tape at the navel, after a normal exhale, without pulling tight. Same conditions every time — the trend across weeks is the signal, a single reading is just a data point.