Estimate ideal body weight using the Devine equation and calculate adjusted body weight with a selected correction factor.
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Adjusted body weight
Using the selected 0.40 correction factor
| Devine ideal body weight | 75.0 kg |
|---|---|
| Actual weight | 100.0 kg |
| Actual ÷ ideal weight | 133.3% |
| Amount above ideal weight | 25.0 kg |
Adjusted weight is a clinical size descriptor. It is not a goal weight and must not be used to choose a medication dose without a clinician or pharmacist.
How adjusted body weight is calculated
The commonly cited equation is AdjBW = IBW + factor × (actual weight − IBW). The default factor is 0.40. This page estimates IBW using the Devine formula: 50 kg for males or 45.5 kg for females at 5 feet, plus 2.3 kg per inch above 5 feet.
Adjusted body weight is sometimes used as a size descriptor in clinical pharmacology because actual weight and ideal weight may each be unsuitable for particular medicines or calculations. The appropriate weight definition and factor depend on the specific clinical protocol.
Why the result is not a dosing recommendation
Different medicines have different distribution and clearance characteristics. Some use actual weight, some ideal or lean weight, some adjusted weight, and some fixed dosing with monitoring. Only follow the instructions of a qualified prescriber, pharmacist, or validated institutional protocol.
Frequently asked questions
Is adjusted body weight a healthy target weight?
No. It is a calculation used in certain professional contexts, not a personal weight target.
Why is 0.40 the default factor?
It is a commonly cited correction factor, but other factors may appear in specific protocols.
What if actual weight is below ideal weight?
The calculator flags that adjusted weight is generally not the intended descriptor in that situation. A professional may use actual weight or another measure depending on the purpose.
Can I calculate a medicine dose here?
No. This page does not recommend or calculate medication doses.
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Medical disclaimer: This educational calculator does not prescribe treatment or establish a medication dose. Confirm all clinical calculations with a qualified healthcare professional.