About this calculator
Adjusted body weight is sometimes used for medication dosing when actual body weight is substantially above ideal body weight. The correct dosing weight depends on the drug, indication, kidney function, and local protocol.
Uses the common adjusted body weight equation: AdjBW = IBW + correction factor × (actual body weight − IBW). A 0.4 correction factor is often used, but medication-specific protocols vary.
Source-mapped educational formula
Educational estimate only; not a diagnosis, prescription, or treatment plan.
Formula and method
Adjusted body weight = ideal body weight + correction factor × (actual body weight − ideal body weight). This calculator uses Devine IBW from height and formula sex.
Limitations and when not to rely on this result
- Educational estimate only; not a diagnosis, prescription, or treatment plan.
- Result depends on accurate inputs and may not apply to complex medical situations.
- Use clinician judgment, local guidance, and urgent care pathways when symptoms are severe.
Frequently asked questions
When is adjusted body weight used? +
It may be used for some medication dosing in people whose actual weight is substantially above ideal body weight.
Is 0.4 always the right correction factor? +
No. 0.4 is common, but the correct factor depends on the medication and protocol.
What if actual weight is below IBW? +
Adjusted body weight is usually not needed; actual or ideal body weight may be used depending on the clinical context.
Can this dose a medication by itself? +
No. Always follow the drug-specific dosing guideline and clinician/pharmacist advice.
Is this for children? +
No. Pediatric dosing weights require pediatric methods.