Ideal Body Weight Calculator

Calculate ideal body weight (IBW) by height and sex using the Devine, Robinson, Miller, and Hamwi formulas.

For educational and clinical reference. Not a substitute for medical judgment.
Devine
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Robinson
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Miller
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Hamwi
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References

  1. Devine BJ. Gentamicin therapy. Drug Intell Clin Pharm. 1974;8:650-655.
  2. Robinson JD, Lupkiewicz SM, Palenik L, et al. Determination of ideal body weight for drug dosage calculations. Am J Hosp Pharm. 1983;40(6):1016-1019.
  3. Miller DR, Carlson JD, Loyd BJ, Day BJ. Determining ideal body weight (and mass). Am J Hosp Pharm. 1983;40(10):1622.
  4. Hamwi GJ. Therapy: changing dietary concepts. In: Danowski TS, ed. Diabetes Mellitus: Diagnosis and Treatment. New York: ADA; 1964.

How to use

  1. Enter height in centimeters.
  2. Select biological sex.
  3. All four formulas update instantly.

Frequently asked questions

What is the Devine formula?

Men: IBW (kg) = 50 + 2.3 × (height in inches − 60). Women: IBW (kg) = 45.5 + 2.3 × (height in inches − 60). Most commonly used for drug dosing.

Why are there multiple IBW formulas?

Different formulas were derived for different populations and clinical use cases. Devine is the most widely used in pharmacy, Robinson and Miller produce slightly different estimates, and Hamwi is the oldest of the four.

Is IBW the same as healthy weight?

No. IBW is a mathematical estimate used primarily for drug dosing. BMI is more commonly used to assess healthy weight ranges.

What is the minimum height for these formulas?

Defined for height > 60 inches (152.4 cm). Below that, results are not meaningful.

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