Ideal Weight Calculator

About this calculator

The Devine formula estimates ideal body weight from height: 50 kg for men or 45.5 kg for women at 5 feet, plus 2.3 kg for every inch of height above that. Originally derived for drug dosing in the 1970s, it remains the most widely used ideal-weight rule of thumb.

A healthy weight is a range, not a single number — frame size, muscle mass and age all shift it. Clinicians often treat Devine ± 10% as the useful band, and the BMI calculator's healthy range (18.5–25) gives an independent cross-check that is often wider.

Treat the result as a reference point for conversation, not a target. For heights below 5 feet the formula's baseline applies without the per-inch addition.