Adjusted body weight calculator helps clinicians, pharmacy students, and healthcare users estimate ideal body weight and adjusted body weight from sex, height, and actual body weight. This tool is useful when total body weight may overestimate dosing weight in larger patients. Users enter sex, choose a height unit, add actual body weight, and get IBW, AjBW, and a step-by-step formula breakdown.
Adjusted Body Weight (AjBW) Calculator
Robinson IBW + 0.4× adjusted body weight formula
Inputs
cm
Changing units clears only this field so you can enter the new value.
ft
in
Changing units clears only this field so you can enter the new value.
kg
Changing units clears only this field so you can enter the new value.
Results
Ideal body weight (IBW)
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Adjusted body weight (AjBW)
—
IBW (Robinson)
—
AjBW
—
Step-by-step derivation
Enter sex, height, and weight, then click Calculate.
Quick summary
- Sex: —
- Height: —
- Actual body weight (ABW): —
- Ideal body weight (IBW): —
- Adjusted body weight (AjBW): —
Reference table & notes
| Sex | Robinson IBW (kg) | Note |
|---|---|---|
| Male | 52 + 1.9 × (in − 60) |
Uses inches above 5 ft baseline |
| Female | 49 + 1.7 × (in − 60) |
Uses inches above 5 ft baseline |
Adjusted weight:
AjBW = IBW + 0.4 × (ABW − IBW)
Informational calculator only. It is not a substitute for professional medical judgment.