This calculator runs four classic ideal-body-weight formulas and gives you a range, not a single number — because no formula is perfect.
Ideal Weight Calculator
Estimate your ideal body weight using Devine, Robinson, Miller and Hamwi formulas.
AU
Ideal weight in Australia
"Ideal weight" is a range, not a single number. Healthdirect Australia frames a healthy weight as the BMI 18.5–24.9 band plus a waist circumference under 94 cm (men) or 80 cm (women). The Devine, Robinson, Miller and Hamwi formulas used here originated in clinical dosing but are still widely cited in Australian dietetic practice as a quick reference range.
Australian sources: Healthdirect — Healthy weight
Frequently asked questions
Which ideal weight formula is most accurate? +
Devine and Miller agree for most adults; Hamwi runs lowest. Use the range, not a single number.
Is ideal weight the same as goal weight? +
Not necessarily. Ideal is a population estimate; goal weight is personal and depends on your goals and history.
Does ideal weight change with age? +
Slightly — frame size and muscle mass shift over time, but height-based formulas don't capture that.
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