Healthy Weight Calculator

BMI is kg / m², so weight is BMI × height in metres squared. This page plugs in the two adult WHO edges: 18.5 for the floor and 24.9 for the ceiling. At 1.75 m, 18.5 × 3.0625 ≈ 56.66 kg and 24.9 × 3.0625 ≈ 76.26 kg. US height is converted to metres first; the displayed range follows the unit system you picked.

A band is not a goalpost in the middle. WHO published cut-offs for screening populations, not a kilogram you “should” weigh. Someone with a lot of muscle can sit above 24.9 and be metabolically fine; someone inside the band can still need clinical care. The calculator does not know any of that.

Child and adolescent ranges use age-and-sex centiles. Those are not applied here. Pregnancy, oedema and amputation also sit outside a simple BMI rearrange. The fitness disclaimer is there because a range can look more authoritative than it is.

Devine ideal weight is a different object: one number from height and a 1974 intercept, originally for dosing references. Boer lean mass uses current weight as well as height. Neither is this band. The BMI page is the same algebra in the other direction — you supply weight and get an index and a category.

Not medical advice. If a clinician gave you a different target range, that instruction wins over a website identity. Feet-and-inches height is combined before the square: 5 ft 9 in is 69 inches, about 1.75 m, so the band is nearly the same as the 175 cm example. Empty inches count as zero. The page will not apply a “plus or minus 10%” fudge; 18.5 and 24.9 are the only edges.