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Calculate IBW and adjusted weight for drug dosing. Updated 2026-08.
Calculate IBW and adjusted weight for drug dosing
Enter your values above to see the result.
For education and screening only — not a substitute for professional medical assessment. Results should be interpreted by your healthcare provider.
Use actual body weight for most dosing unless the label specifies IBW.
For clearance-based dosing (e.g., aminoglycosides, some anticoagulants), adjusted body weight is commonly used: IBW + 40% of the excess.
Use actual (lower) weight for dosing — or the label's specified weight.
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This content is a general reference, not medical advice, a diagnosis, or a treatment plan. Do not change your diet, fluids, medicines, or dialysis plan without your nephrologist or renal dietitian. Individual recommendations depend on your labs, medications, conditions, and care plan.