An ideal weight calculator estimates a target body weight range based on your height, sex, and body frame. Unlike BMI, which gives a single number, ideal weight formulas provide a weight range considered healthy for a given height. Multiple different formulas exist — developed independently by different medical researchers — and this calculator shows results from all of them for comparison.

The four most widely used formulas are: the Devine formula (1974, originally for drug dosing), the Robinson formula (1983), the Miller formula (1983), and the Hamwi formula (1964). Each was developed for slightly different clinical contexts and produces slightly different results. No single formula is universally accepted as the most accurate.

Important caveat: "ideal weight" is a statistical concept based on population averages, not an individual prescription. Muscle mass, bone density, body proportions, and ethnic background all affect what a healthy weight looks like for a specific person. Use this as a reference range, not a goal.