"Ideal weight" formulas have a long, genuinely flawed history in medicine — and this tool presents one such widely referenced estimate while being upfront about exactly what it can and can't tell you.
A concept with roots in life insurance actuarial tables, not clinical research
Much of the historical foundation for "ideal weight" estimates traces back to early 20th-century life insurance industry actuarial tables — most famously the Metropolitan Life Insurance Company's height-weight tables, first published in 1943 — which correlated policyholders' weight with mortality outcomes for the purpose of setting insurance premiums, not for individualized medical guidance. Later formulas like the Devine formula (1974), Robinson formula (1983) and Miller formula (1983) were developed primarily as practical tools for estimating appropriate medication dosing in clinical settings, based on a person's frame, not as authoritative statements about optimal individual health — a genuinely different original purpose than how these numbers are often popularly understood today.
What this calculation actually estimates
The tool applies one of these established height-based formulas to estimate a reference weight value based on your height and sex — a population-derived statistical reference point, not a personalized medical assessment accounting for your individual body composition, muscle mass, frame size or overall health context.
Where these formulas are actually used in practice
- Clinical medication dosing — several ideal weight formulas remain genuinely useful in modern medicine specifically for calculating appropriate drug dosages, since many medications need to be dosed relative to lean body mass rather than total body weight.
- General reference and self-education — some people find these formulas a useful, if limited, general reference point when thinking broadly about weight-related health goals.
- Historical and actuarial research — understanding how insurance and early clinical practice conceptualized "healthy" weight offers useful historical context for how modern body weight metrics evolved.
- Starting point for a broader health conversation — these numbers can serve as one small input among many when discussing weight-related goals with a healthcare provider, rather than a standalone target.
Frequently asked questions
Is there one universally agreed "ideal weight" formula? No — several different formulas exist (Devine, Robinson, Miller, Hamwi, among others), each producing somewhat different results for the same height, and none is considered a definitive, universally superior standard, since they were each derived from different populations and for somewhat different original purposes.
Do these formulas account for muscle mass or body frame? Generally no, or only very crudely — these formulas are based primarily on height (and sometimes a rough frame-size adjustment), meaning a muscular, athletic individual and a sedentary individual of the identical height would receive the same "ideal weight" estimate despite potentially very different, and both entirely healthy, actual body compositions.
Should I use this number as a personal weight goal? These formulas are best understood as one general historical reference point rather than a personalized target — a healthcare provider who can consider your full individual health context, body composition and goals is a far better source for meaningful, individualized weight-related guidance.
Further reading
Wikipedia — Human body weight — Overview of various ideal weight formulas and their actuarial and clinical origins.