⚖️ Adjusted Body Weight
Calculate adjusted body weight for drug dosing in obesity.
Clinical takeaway
The correct dosing weight is drug-specific.
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When to use
Dose drugs that use adjusted body weight (e.g. aminoglycosides).
How it works
AdjBW = IBW + 0.4 × (actual − IBW); IBW from the Devine formula.
Key points
- The correct dosing weight is drug-specific.
- IBW uses height and sex (Devine).
- Verify against each drug's reference.
References
Decision support for licensed clinicians only; not a substitute for clinical judgement, diagnosis or local protocols.
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Height | 175 cm |
|---|---|
| Actual body weight | 100 kg |
| Sex | Male |
→Adjusted body weight82.3kg
- Ideal body weight：70.5 kg (Devine)
- Formula：IBW + 0.4 × (actual − IBW)
| Height | 175 cm |
|---|---|
| Actual body weight | 100 kg |
| Sex | Female |
→Adjusted body weight79.6kg
- Ideal body weight：66.0 kg (Devine)
- Formula：IBW + 0.4 × (actual − IBW)
Frequently asked questions
- What is Adjusted Body Weight?
- Calculate adjusted body weight for drug dosing in obesity.
- How is Adjusted Body Weight calculated? What is the core formula?
- AdjBW = IBW + 0.4 × (actual − IBW); IBW from the Devine formula.
- When is Adjusted Body Weight used?
- Dose drugs that use adjusted body weight (e.g. aminoglycosides).
- What are the key clinical points for Adjusted Body Weight?
- The correct dosing weight is drug-specific. IBW uses height and sex (Devine). Verify against each drug's reference.
- What are the limits and cautions when using Adjusted Body Weight?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- How is Adjusted Body Weight calculated in practice? Can you show a worked example?
- Inputs: Height 175 cm, Actual body weight 100 kg, Sex Male → Result: Adjusted body weight 82.3 kg（Ideal body weight: 70.5 kg (Devine), Formula: IBW + 0.4 × (actual − IBW)） Inputs: Height 175 cm, Actual body weight 100 kg, Sex Female → Result: Adjusted body weight 79.6 kg（Ideal body weight: 66.0 kg (Devine), Formula: IBW + 0.4 × (actual − IBW)）