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Dilution and Concentration Calculator

Work out dilutions, mass percent and ppm concentrations.

  • Free
  • No sign-up
  • Nothing is sent or stored
Formula
mol/L
mL
mL

Result

Stock concentration
2.5 mol/L
Final concentration (C₂)
0.5 mol/L
Final volume (V₂)
250 mL
Stock volume to use (V₁)
50 mL
How it was calculated
  1. C₁ = C₂ × V₂ ÷ V₁
  2. C₁ = 2.5 mol/L
Use any consistent units: if both volumes are in mL, the result's volume is in mL too.

The calculation happens instantly in your browser. The numbers you enter are not sent to our servers or saved.

How to use the Dilution & Concentration Calculator

  1. Choose dilution, mass percent or ppm.
  2. Pick what to solve for.
  3. Enter the values in consistent units.

What does this tool do?

When you dilute a solution, the amount of solute stays the same, so C₁V₁ = C₂V₂. To make 250 mL of 0.5 M from a 2.5 M stock, you need 50 mL of stock topped up to 250 mL.

Mass percent and parts per million express concentration as a share of the total mass — ppm is common for trace amounts in water and air.

Why use it?

  • Three concentration formulas.
  • Solve for any variable.
  • Any consistent units.

The formula

C₁V₁ = C₂V₂
% w/w = solute ÷ solution × 100
ppm = solute ÷ solution × 10⁶

Privacy

The calculation happens instantly in your browser. The numbers you enter are not sent to our servers or saved. There's no account to create and nothing to install.

Last reviewed by the M2Toolkit team.

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