Ideal Weight Calculator
Three formulas, three answers. The range between them is the honest output.
Devine
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Robinson
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Miller
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Healthy BMI 18.5–24.9 range
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Worked example
At 175 cm, the three male formulas give 65.2, 65.4 and 65.5 kg — close together here, but they diverge by several kilograms at the extremes of height.
These formulas were built for drug dosing, not for setting personal targets. They assume a specific body composition and were derived from mid-twentieth-century insurance data, which is why three of them disagree by a few kilograms on the same person.
Use the range
The healthy BMI band for your height is a wider and more defensible target than any single formula. If your weight sits inside it and your measurements are stable, the precise "ideal" number adds nothing.