Ideal Weight Calculator

See your ideal body weight from four popular reference formulas, side by side, plus the healthy weight range implied by BMI.

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Why four different formulas?

"Ideal body weight" formulas were originally developed to help estimate medication dosages, not to define a cosmetic target. Different researchers derived slightly different coefficients from their own study populations, which is why Robinson, Miller, Devine, and Hamwi don't quite agree — they're independent estimates of the same underlying idea, not four measurements of one true number.

What these formulas don't account for

Every formula here uses only height and gender. None of them factor in muscle mass, body frame size, or body composition — so a muscular, athletic person can easily fall "above" their formula weight while being perfectly healthy. Treat these as reference points, not targets to chase.

The Devine formula is the most widely used of the four in clinical settings today, largely because of its long history in dosage calculations — but no single formula is considered definitively "correct."

Common questions

Why doesn't age change the result?

These particular formulas were derived for adults and depend only on height and gender — age matters more for children and teens, whose healthy weight is usually assessed against CDC growth percentile charts instead.

Which number should I actually use?

None of them alone — use the spread across all four (and the healthy BMI range) as a rough band, not a single precise target. Body frame size, muscle mass, and overall health matter more than hitting an exact number.

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