“What should I weigh?” is one of the most common health questions, and the honest answer is: a range, not a number. The old formulas that spit out a single “ideal weight” are useful context — as long as you understand what they are and are not telling you.
TL;DR — Enter your height in the ideal weight calculator to see a healthy weight range plus a formula-based target.
Where the formulas come from
Equations like the Devine formula were originally created decades ago to help with medication dosing, not to set personal goals. They estimate a weight from your height and sex. They are reasonable rough guides, but they were never meant to define a perfect body.
Why a range is better
People of the same height come in very different builds. Someone with more muscle or a larger frame will naturally sit higher on the scale while being perfectly healthy. That is why this calculator shows the weight range matching a healthy BMI (18.5–24.9) rather than insisting on one figure — a band you can sit anywhere within.
Use it as a guidepost
Treat an ideal-weight figure as a loose guidepost, not a destination. How you feel, how you move, your body composition and your clinician’s input all matter more than hitting an exact number. Run your height through the ideal weight calculator for a sensible range to aim toward.