Molarity & Dilution Calculator

Find molarity from moles and volume, or solve a dilution with the C₁V₁ = C₂V₂ relationship. Calculates in your browser.

Enter any two.

Moles-
Volume-
Molarity-

Show the math

Molarity is moles of solute per litre; dilution conserves the amount of solute:

M = mol ÷ L  ·  C₁V₁ = C₂V₂

In dilution mode the volume units just need to match, the result is in the same unit you entered. All math runs in your browser.

What this does

A molarity & dilution calculator finds molarity from moles and volume, or solves a dilution with the C₁V₁ = C₂V₂ relationship.

How to use it

  1. Choose molarity or dilution.
  2. Enter the known values.
  3. Read the missing quantity.
  4. Keep volume units consistent.

How it works

Molarity is moles of solute per litre. Diluting conserves the solute, so the concentration-volume product stays equal before and after.

M = mol ÷ L; C₁V₁ = C₂V₂

Understanding your result

The dilution relationship works because the amount of solute does not change when you add solvent, only the concentration does, so the concentration-times-volume product stays equal before and after. Always add concentrated solution to water rather than the reverse for safety with strong acids, and remember molarity shifts slightly with temperature as the volume expands.

Example

Diluting 10 mL of 1 M to 100 mL gives 0.1 M.

Sources & methodology

Last updated .

Frequently asked questions

What is molarity?

Molarity is moles of solute per litre of solution: M = mol ÷ L. Enter any two of the three to get the third.

How does the dilution formula work?

Diluting conserves the amount of solute, so C₁V₁ = C₂V₂. The volume units only need to match each other.

Is my data stored?

No. Everything is calculated locally in your browser.