IV Solution Reconstitution Calculator
Calculate volume of stock solution needed to prepare a target concentration (C₁V₁ = C₂V₂).
Understanding this tool
Why nurses use it
Bedside and ward nurses preparing admixtures use C₁V₁ = C₂V₂ proportional math to determine how much stock solution to add to reach a target concentration — always alongside pharmacy guidance.
When to use it
Use for dilution calculations when preparing a specific final concentration and volume — verify compatibility, stability, and route with pharmacy or the product monograph.
Calculate
How to use this calculator
- Enter stock concentration, target concentration, and final volume needed.
- Calculate stock volume required and diluent to add.
- Label clearly and verify before administration.
How the calculation works
Stock volume = (Target concentration × Target volume) ÷ Stock concentration. Remaining volume is diluent to reach final volume.
Formula used by this tool — verify units before applying at the bedside.
Worked example
Limitations & clinical notes
- Does not account for drug volume displacement in all products.
- Compatibility and stability must be verified before admixture.
- Follow your local pharmacy aseptic preparation policy and injectable medicines guide.
References
Key sources: Product monograph / SmPC; Local pharmacy IV guide / aseptic preparation policy.
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Disclaimer: This calculator is for educational and bedside double-check purposes only. It does not replace institutional protocols, prescriber orders, pharmacist verification, or clinical judgment. Always follow your local policies — especially for high-risk medications, infusions, pediatrics, and critical care. If the patient is acutely unwell, escalate immediately rather than relying on any calculator output.