“Ideal weight” formulas give a rough target based on height and sex. They're simple clinical estimates — useful as a ballpark, not a precise goal, since they don't account for build, muscle, or age.
The Devine formula
This calculator uses the Devine formula, originally created for medication dosing: a base weight at five feet of height, plus 2.3 kg for each additional inch. Other formulas (Robinson, Miller, Hamwi) give slightly different numbers.
A healthy weight is a range, not a single figure. Body composition and overall health matter more than hitting an exact number — talk to a clinician for personalized guidance.