Dilution (C1V1 = C2V2) calculator

How it works

Enter three of the four values to find the missing one.

The formula

C₁V₁ = C₂V₂, so V₁ = C₂V₂ ÷ C₁.

Worked example

To make 250 mL of 0.2 M from a 1.0 M stock: V₁ = 0.2 × 250 ÷ 1.0 = 50 mL of stock, topped up with water to 250 mL.

Good to know

• Use the same volume units on both sides.
• Add acid to water, never water to acid.