Dilution Calculator (C₁V₁ = C₂V₂)
How much stock solution to take to reach a target concentration and volume.
Result
Stock volume to take (V₁)
100.00
Solvent to add
400.00
How it works
V₁ = C₂ × V₂ ÷ C₁
To dilute, take a small volume of concentrated stock and top up with solvent. The formula C₁V₁ = C₂V₂ gives exactly how much stock to use.
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Frequently asked questions
How much solvent do I add?
The final volume minus the stock volume taken — shown as the second result.
Do the units have to match?
Concentrations must share a unit, and so must the volumes; the result is in the volume unit you used.
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