Dilution Calculator

How the dilution calculator works

Diluting a stock solution conserves the amount of solute, so the product of concentration and volume is the same before and after. That single relationship, C1V1 = C2V2, answers every standard dilution question once you choose which term is unknown.

For accurate work, make up to the final volume in a volumetric flask rather than adding a calculated volume of diluent, since volumes are not perfectly additive.

Frequently asked questions

How do you calculate a dilution?

Rearrange C1V1 = C2V2. To find the stock volume needed, V1 = C2V2 ÷ C1. The diluent to add is the final volume minus that stock volume.

What is a dilution factor?

The ratio of final volume to stock volume. Taking 5 mL of stock up to 100 mL is a 1:20 dilution, which reduces the concentration twentyfold.

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