Ideal Body Weight Calculator — educational

Estimate your ideal body weight from your height and sex using four peer-reviewed formulas: Devine (1974), Robinson (1983), Miller (1983), and Hamwi (1964). Type an optional current weight to see the 50/50 adjusted body weight that clinical drug-dose formulas use. The headline is the unweighted mean of the four predictions. All math runs in your browser. Nothing is uploaded.

Units
Sex
Between 120 cm (4'0") and 220 cm (7'3").
kg
When provided, the page computes ABW = IBW + 0.5 × (actual − IBW) for each formula.
Consensus IBW (unweighted mean of the four formulas)
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kg
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All four formulas at a glance

Each formula is its own validated model; the predictions are not interchangeable. The headline above is the unweighted mean. The table below shows each formula's prediction side by side, plus its adjusted body weight when you provide your current weight.

IBW by height — quick reference

Devine (1974) values for the current sex, across the adult height range. Use the form above to see the other three formulas.

Height Devine IBW

About the formulas

  • Devine (1974) — derived from insurance actuarial tables; the most-cited in clinical practice. Hospitals use it for drug-dose adjustments in overweight patients (Cockcroft–Gault creatinine clearance, most weight-based chemotherapy, etc.).
  • Robinson (1983) — re-derived from a 1983 sample of working adults. Predicts a slightly lower IBW than Devine, especially for women.
  • Miller (1983) — the highest of the three 1983 re-derivations for adult men. Most useful as an upper bound in clinical contexts.
  • Hamwi (1964) — the oldest of the four, often used as a quick mental shortcut ("106 lb at 5 ft, plus 6 lb per inch over" for men).

All four formulas were derived on non-Hispanic white populations in the 1950s–80s. They systematically over-predict in some Asian and African populations and under-predict in very tall people. BMI is a better population-level tool; IBW is useful as a clinical dose-weight target. Nothing here is medical advice — talk to a doctor or registered dietitian for personal health guidance.