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Solutions · Chemistry

Molarity & Dilution Calculator

Calculate solution molarity or the final volume required for a dilution using transparent, classroom-ready formulas.

Formula shown Runs locally Reviewed Aug 11, 2026
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Equation guide

Solution concentration and dilution without solute loss

Molar concentration

M = n/V

Dilution relation

C₁V₁ = C₂V₂
Solution calculator

Choose a concentration problem

Use liters for molarity. In dilution mode, V₁ and V₂ must use the same volume unit; solute amount is assumed unchanged.

M

Your result will appear here.

Using the model

Symbols, assumptions and limitations

Interpretation notes

Molarity uses non-negative moles per liter of solution, so zero solute gives zero molarity. Dilution inputs remain positive, and volumes may use any unit provided V₁ and V₂ use the same one.

Worked examples

See the method in practice

01

Molarity example

0.50 mol dissolved to make 2.00 L produces a 0.25 M solution.

02

Dilution example

25 mL of 2.0 M stock diluted to 0.50 M requires a final volume of 100 mL.

Questions

Frequently asked

Is molarity the same as moles?

No. Molarity is the amount in moles divided by the total solution volume in liters.

Does C₁V₁ = C₂V₂ work for reactions?

It describes dilution without changing solute amount; it is not a general reaction-stoichiometry equation.

Sources & review

Equations and examples are checked against the references below. Results are educational and should be independently verified for safety-critical work.

IUPAC Gold Book — amount concentration

Written by the STEM Hub editorial team · Reviewed August 11, 2026 · Review methodology