Adjusted Body Weight Calculator
Calculate Adjusted Body Weight (AdjBW) for clinical dosing in obese patients.
Enter Values
Result
Enter values above and click Calculate to see your result.
AI Assistant
Ask about this calculator
I can help you understand the adjusted body weight calculator formula, interpret your results, and answer follow-up questions.
Try asking
Formula
Adjusts weight to account for the slower distribution of certain drugs in fat tissue.
Worked Example
Adjusted Body Weight (AdjBW)
- Formula: AdjBW (kg) = IBW + 0.4 × (Actual Weight - IBW)
- It is typically used when Actual Weight is >20-30% above Ideal Body Weight
- The 0.4 factor (40%) represents the estimated volume of distribution in adipose tissue for specific drugs
- Ideal Body Weight (Devine) is used as the baseline for the calculation
AdjBW is a pharmacology-specific metric. Dosage adjustments should always follow established clinical guidelines for each specific medication.
You can also calculate changes using our Ideal Weight Calculator or Creatinine Clearance Calculator.
Frequently Asked Questions
When is AdjBW used?
It is used for dosing certain hydrophilic medications in obese patients to prevent toxicity that might occur if actual body weight were used.
Why the 0.4 factor?
Research suggests that for many drugs, only about 40% of excess body weight (fat tissue) contributes to the drug's volume of distribution compared to lean tissue.
Is AdjBW the same as Lean Body Mass?
No. Lean Body Mass is an estimate of total non-fat tissue, while Adjusted Body Weight is a calculated weight used specifically for pharmacokinetics.
AI Assistant
Ask about this calculator
I can help you understand the adjusted body weight calculator formula, interpret your results, and answer follow-up questions.
Try asking
Related Calculators
Secure and Private
All calculations run locally. Your data never leaves your browser.
Precise Calculations Powered by Calculory AI