Adjusted Body Weight (AjBW) Calculator
Robinson IBW + 0.4× rule
Height unit
cm
ft
in
Weight unit
kg
Ideal body weight (IBW) — Robinson
kg
Uses Robinson’s formula:
Men: 52 + 1.9×(in − 60),
Women: 49 + 1.7×(in − 60) (kg).
Adjusted body weight (AjBW)
kg
Formula:
AjBW = IBW + 0.4 × (ABW − IBW)
Step-by-step derivation
Enter sex, height, and weight to see the algebra here…
Quick summary
- Sex: —
- Height: —
- Actual body weight (ABW): —
- Ideal body weight (IBW): —
- Adjusted body weight (AjBW): —
Reference table & sources
| Sex | Robinson IBW (kg) | Note |
|---|---|---|
| Male | 52 + 1.9 × (in − 60) |
Height in inches (in) over 5 ft |
| Female | 49 + 1.7 × (in − 60) |
Height in inches (in) over 5 ft |
Adjusted weight:
AjBW = IBW + 0.4 × (ABW − IBW)
Sources: Robinson JD et al., Am J Health-Syst Pharm (1983);
Winter MA et al., Pharmacotherapy (2012). Informational use only.