Calculate dilution

Solve one missing concentration or volume in a conserved-solute dilution.

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ToolDilution Calculator
Input
Output
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Preview

How it works

The identity C₁V₁ = C₂V₂ relates concentration and volume in compatible units. Three supplied values determine the missing concentration or volume by rearrangement.

  • No stock strength or vessel size is assumed.
  • Exactly one blank field identifies the unknown.

Worked example

Diluting a stock solution
How much 2M stock is needed to make 500mL of 0.5M, final volume left blank
Input
											C1: 2
V1: 100
C2: 0.5
Output
												C1: 2
V1: 100
C2: 0.5
V2: 400

When to use this

Laboratories prepare working solutions, clinicians calculate dose dilutions, and chemistry classes check serial dilution.

Edge cases

  • Mixing millilitres with litres changes the result by 1,000.
  • A target above stock is not a dilution under the conserved-solute model.
  • Two blank fields are underdetermined and rejected.