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General MedicineIBW & AjBW40

Ideal Body Weight (IBW) & Adjusted Body Weight Calculator

Calculate adult ideal body weight (IBW) with the Devine formula from height and optionally derive fixed adjusted body weight (AjBW40) from actual weight.

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QuickMedCalc is developed and maintained by an independent developer. Medical content is not independently reviewed by a physician.

Formula and medical content are based on the references listed on this page. See sources, About, and Sources and Review Process.

Changing units clears height values rather than relabeling them.

Devine domain: 152.4–274.32 cm.

Explicit model coefficient; never inferred from another field.

Optional adjusted body weight (AjBW40)

Optional. Use the actual weight appropriate to the external workflow; leave blank for Devine IBW only.

Unit for actual weight.

Changing the actual-weight unit clears the entered weight instead of relabeling the same number.

Results

Enter height and an explicit Devine coefficient. Actual weight is optional and unlocks AjBW40 only.

About

This Ideal Body Weight (IBW) and Adjusted Body Weight calculator uses standing height and an explicitly selected published coefficient to calculate the historical adult Devine reference weight. If actual weight is also entered, it passes the raw Devine result directly into the fixed AjBW40 arithmetic. [1, 2, 3]

“Ideal” and “adjusted” are model names, not personalized healthy-weight targets. The calculator does not infer a coefficient, obesity, a universal 120% threshold, medication applicability, a dose, creatinine clearance, or ventilator predicted body weight.

Formula

Devine adult reference: 50 kg (published male coefficient) or 45.5 kg (published female coefficient) at 60 inches, plus 2.3 kg per inch above 60. [1, 2]
AjBW40 = Devine IBW + 0.4 × (actual body weight − Devine IBW). The fixed 0.4 arithmetic does not establish clinical applicability. [3, 4]

Interpretation

Devine is a historical height-based reference equation, not a personalized healthy-weight goal.

Mathematical availability does not establish medication, renal, dosing, or other clinical applicability.

References

  1. McCarron MM, Devine BJ. Clinical Pharmacy: Case Studies: Case Number 25 Gentamicin Therapy. Drug Intelligence & Clinical Pharmacy. 1974;8(11):650–655. doi:10.1177/106002807400801104.
  2. Pai MP, Paloucek FP. The origin of the ‘ideal’ body weight equations. Ann Pharmacother. 2000;34(9):1066–1069. PMID 10981254.
  3. Traynor AM, Nafziger AN, Bertino JS Jr. Aminoglycoside dosing weight correction factors for patients of various body sizes. Antimicrob Agents Chemother. 1995;39(2):545–548. PMID 7726530.
  4. Pai MP. Drug dosing based on weight and body surface area: mathematical assumptions and limitations in obese adults. Pharmacotherapy. 2012;32(9):856–868. PMID 22711238.

FAQ

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Disclaimer

Educational and informational reference only. Not intended to replace professional medical advice, diagnosis, treatment, or independent verification.