Adjusted Body Weight Calculator
Ideal, adjusted and lean body weight for drug dosing.
Enter your values to see the result.
Ideal body weight uses Devine (1974); adjusted body weight = IBW + factor × (actual − IBW); lean body weight uses Janmahasatian (2005). Which weight to dose with depends on the drug, so follow its monograph. For education and clinical decision support only. Results do not replace professional judgment, local protocols or the product information, so always verify doses and values before acting on them.
Continue your work
- Ideal Body Weight Calculator — Compare other ideal weight formulas.
- Creatinine Clearance Calculator — Use the weight in Cockcroft–Gault.
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Clear instructions
Find steps, examples and limitations below.
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How to use the Adjusted Body Weight Calculator
Ideal, adjusted and lean body weight for drug dosing.
- 1 Choose sex and enter height and actual weight.
- 2 Pick the adjustment factor (0.4 is most common).
- 3 Read the ideal, adjusted and lean body weights.
Example and practical tips
A man 175 cm tall weighing 110 kg has an ideal body weight of 70.5 kg and an adjusted body weight of 86.3 kg.
Frequently asked questions
When is adjusted body weight used?
For drugs that distribute partly into fat, such as aminoglycosides, and for Cockcroft–Gault in obesity. Follow each drug’s guidance.
What is lean body weight?
The weight without fat, estimated with the Janmahasatian formula. It is used for some anesthetic drugs.
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