Ideal Weight Calculator
Your ideal weight isn't a single number — compare four trusted formulas and a healthy BMI range at a glance.
Sex
These formulas are calibrated for average adult heights — treat the result as a rough estimate.
Ideal body weight
Estimates based on statistical formulas, not medical advice. Ideal body weight also depends on age, frame size and muscle mass.
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Devine, Robinson, Miller or Hamwi — which ideal-weight formula should I trust?
None of them is the single "true" answer. All four estimate ideal body weight from height and sex, but they were derived from different populations, so they disagree by a few kilograms — that spread is exactly why this ideal weight calculator shows them side by side. The Devine formula (1974) is the most widely used and was originally built for medication dosing; Robinson and Miller (both 1983) usually give slightly lower figures; Hamwi (1964) is the oldest quick rule of thumb. Read them as a range, not a target to the decimal.
Why show a healthy weight RANGE instead of one ideal number?
Because no single number fits every healthy body. The four formulas give point estimates, but real bodies differ in bone structure and muscle. The healthy weight range here comes from the WHO's healthy BMI band (18.5–24.9) applied to your height, so it answers "how much should I weigh" as a span rather than one figure. Sitting anywhere inside that range is generally considered a healthy weight for your height.
Why do men and women get different ideal weights at the same height?
On average, men carry more muscle and denser bone than women at the same height, so every one of these formulas sets a higher baseline for males. That is why the calculator asks for your sex before computing your ideal body weight. The healthy BMI range, by contrast, is identical for both sexes, because BMI itself does not separate by sex.
Ideal weight vs healthy weight vs BMI — what is the difference?
Ideal (body) weight is a single target figure from a formula like Devine or Hamwi. A healthy weight is a range you can sit anywhere within, taken here from a healthy BMI. BMI is the underlying number (weight ÷ height²) used to define that band. This tool shows all three at once: four ideal-weight figures, the healthy weight range, and — if you add your current weight — where you fall relative to it.
Is my height and weight sent to a server?
No. Every calculation in this ideal weight calculator runs entirely in your browser; your height, sex and weight never leave your device. Your last entry is saved only in your browser's localStorage for convenience on your next visit, and you can clear it anytime.