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Adjusted Body Weight

Professional clinical tool for calculating IBW and AjBW for medical dosing.

Patient Data

Adjusted Body Weight

0 lbs

Ideal Body Weight (IBW)0 lbs
Dosing RecommendationUse Actual Weight
Actual weight is within normal range of IBW. Adjustments may not be necessary.

What is Adjusted Body Weight (AjBW)?

Adjusted Body Weight is a measure used by healthcare professionals to determine medication dosages (such as aminoglycosides or heparin) and nutritional requirements in patients who are overweight or obese. It provides a middle ground between Actual Body Weight and Ideal Body Weight.

The Formulas Used

Our calculator first determines your Ideal Body Weight (IBW) using the standard Devine Formula:

  • Males: 50 kg + 2.3 kg for each inch over 5 feet.
  • Females: 45.5 kg + 2.3 kg for each inch over 5 feet.

Then, the Adjusted Body Weight is calculated as:

AjBW = IBW + 0.4 × (Actual Weight - IBW)

When to Use Adjusted Body Weight

Clinicians typically use Adjusted Body Weight when a patient's actual weight is more than 20% to 30% above their ideal body weight. In these cases, using actual weight might lead to over-dosing, while using ideal weight might lead to under-dosing.

Note on Accuracy

This tool is intended for educational and informational purposes. Always consult with a licensed medical professional or pharmacist for clinical dosing decisions.