Compare adult ideal-body-weight estimates from the Devine, Robinson, Miller, and Hamwi formulas, alongside a separate BMI healthy-weight reference range.
Ideal body weight formulas are height- and sex-based rules originally used in clinical and nutrition contexts. They do not measure body composition, fitness, or health, and their different constants produce different answers for the same person.
CalcRocket displays all four estimates and their arithmetic average without selecting a preferred formula. Treat the values as broad informational references, not a prescribed target.
Devine proposed the equation for estimating drug clearance and dosing weight. It later became one of the most frequently cited ideal-body-weight equations.
Male: 50 kg + 2.3 kg × inches over 5 ft · Female: 45.5 kg + 2.3 kg × inches over 5 ftRobinson and colleagues derived revised linear equations from height-and-weight reference data.
Male: 52 kg + 1.9 kg × inches over 5 ft · Female: 49 kg + 1.7 kg × inches over 5 ftMiller and colleagues published another revision using a higher five-foot base and smaller per-inch increments.
Male: 56.2 kg + 1.41 kg × inches over 5 ft · Female: 53.1 kg + 1.36 kg × inches over 5 ftHamwi introduced a quick height-based rule used in nutrition practice. Published versions may also discuss body-frame adjustments; this calculator does not apply them.
Male: 48 kg + 2.7 kg × inches over 5 ft · Female: 45.5 kg + 2.2 kg × inches over 5 ftHeight is in meters and weights are kilograms. This adult BMI screening range is calculated independently from the four formula estimates.
Minimum = 18.5 × height² · Maximum = 24.9 × height²The implementation keeps full precision and rounds only for display.
180 cm equals 70.866… inches, or 10.866… inches above 5 feet. Devine gives 74.99 kg, Robinson 72.65 kg, Miller 71.52 kg, and Hamwi 77.34 kg.
The four-formula average is 74.13 kg. At 1.8 m, the separate BMI 18.5–24.9 reference range is 59.94–80.68 kg.
Look at the spread across formulas rather than treating one method as correct or best.
The BMI range uses height squared and measures a different concept from the linear ideal-weight formulas.
Muscle mass, bone structure, and fat distribution can make a person's current weight differ substantially from these estimates.
The equations were created at different times from different reference assumptions. Their five-foot baselines and per-inch increments vary, so disagreement is expected rather than an error.
The four formulas increase weight linearly for each inch above five feet and use sex-specific constants. The BMI range increases with height squared and does not use sex. Neither approach directly measures fat, muscle, bone, or metabolic health.
The published equations describe inches over five feet and are unreliable at height extremes. For a height below five feet, this calculator consistently uses each formula's five-foot base (zero inches over five feet) instead of extrapolating into implausible or negative results. The BMI range still uses the entered height.
These formulas do not account for age, body frame, ethnicity, pregnancy, disability, edema, or body composition. Athletes and muscular people may differ substantially. No single formula defines a healthy weight, and personal health questions belong with a qualified clinician.
It is a formula-based reference estimate derived mainly from height and sex. It is not a direct measurement of health or body composition.
No one formula is best for every person or use. The calculator shows all four because their assumptions and estimates differ.
Each uses a different five-foot starting weight and a different amount added per inch, reflecting different historical derivations.
They provide different kinds of context. BMI relates weight to height squared, while these ideal-weight formulas are linear height-based estimates. Neither is diagnostic.
They can view the estimates, but greater muscle mass can make the comparison less representative. The formulas do not measure body composition.
Yes. The four published methods use separate male and female constants.
Age may affect health and body composition, but it is not an input in these four formulas.
BMI is a screening measure and does not distinguish muscle from fat or capture every individual factor. Discuss personal concerns with a qualified health professional.
Formula constants, history, and BMI context sources.