Ideal Weight (Robinson Formula) Calculator

About this calculator

The Robinson formula (1983) is one of several height-based ideal body weight equations used in clinical medicine, calculated separately for men and women from height above a base of 5 feet, with a fixed starting weight plus a per-inch increment added for each inch over that base height (e.g., roughly 52 kg + 1.9 kg per inch over 5 feet for men, with different constants for women). It's one of a family of similar formulas including Devine, Hamwi, and Miller, all developed mid-20th century primarily to standardize drug dosing calculations, not as a general fitness or beauty benchmark.

Clinicians and pharmacists still use Robinson and its sibling formulas today to estimate an ideal body weight for dosing certain medications by weight, and in some clinical nutrition calculations, though these formulas are population averages and don't account for individual differences in frame size, muscle mass, or body composition.

This calculator takes your height and sex and returns your ideal body weight using the Robinson formula.