Adjusted Body Weight Calculator

For medications dosing in patients with obesity

140 cm 182 cm 220 cm
182 cm
6’0″
Greater height between 5’8″ (175 cm) and 6’0″ (183 cm)
50 lbs 200 lbs 500 lbs
200 pounds
91 kg
Greater weight between 50 lbs and 500 lbs

Ideal Body Weight (IBW)

68.4 lbs

Continent optimal weight for height

Adjusted Body Weight (ABW)

121.0 lbs

For medications dosing in obesity

Excess Body Weight

131.6 lbs

Weight above ideal

Clinical Application Notes

  • Use Adjusted Body Weight for dosing medications with poor fat distribution (e.g., aminoglycosides, vancomycin).
  • Use Actual Body Weight for medications that distribute well into adipose tissue.
  • For patients > 1.20% of IBW, consider using ABW for hydrophilic drugs.
  • Always combine with clinical judgment and therapeutic drug monitoring.

Formula

ABW = IBW + 0.4 × (Actual Weight – IBW)

This tool uses the Devine formula for IBW calculation. Results are estimates for clinical reference.