Ideal Body Weight Formulas Compared: 4 at Once
Calculate your ideal body weight from height and sex with four classic formulas — Devine, Robinson, Miller and Hamwi — plus the healthy BMI range, right in your browser.
Processed entirely in your browser — nothing you enter here is ever uploaded.
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About this tool
This page opens the ideal weight calculator with all four classic formulas front and center: Devine (1974), the standard still used for drug-dosing calculations in medicine; Hamwi (1964), the original quick clinical rule of thumb it was built to refine; and Robinson (1983) and Miller (1983), two later re-fits of the same idea using different reference data.
All four share the same structure — a base weight at 5 feet plus a fixed number of kilograms per inch above that — but the constants differ enough that the four results for one height can spread across several kilograms. Seeing them side by side, rather than picking whichever formula a random source quoted, makes clear that 'ideal body weight' was never a single settled number, only a family of similar estimates.
Enter your height and sex to generate all four results at once, alongside the healthy BMI weight range (18.5–24.9) for that height as an independent cross-check. When the formulas and the BMI range roughly agree, that overlap is the most defensible reference point; when they diverge, especially for very short or very tall heights where the classic equations were never validated, the BMI range is the more robust guide.
Example. A height of 177.8 cm for male sex returns a Devine weight of 73.0 kg.
Limit. Height must be from 100 cm to 250 cm, and the four formulas are omitted when the height is under 5 feet.