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Molarity Calculator

Solve M = n/V for molarity, amount of solute, or final solution volume, with mol/mmol and L/mL conversions.

Introductory chemistry

Enter your values

Use a decimal point or scientific notation (1e-3). Choose units before calculating.

Choose the unknown quantity. Its number field is hidden; its unit selector remains available for the result.
Enter a positive amount of dissolved solute, not its mass.
Use the total final volume of the solution, not the solvent volume alone.
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Calculations run on your device. No account, name or email is required.

Your result

Enter your values and press Calculate to see your answer and all five solution steps.

M = n / V; n = M × V; V = n / M

Common Mistakes

  • Do not divide by a volume in mL without converting it to L (or use a matching mmol/mL-style unit deliberately).
  • Use the final total solution volume, not the volume of solvent added before dissolution.
  • Molarity (mol/L) is not molality (mol/kg of solvent).

Assumptions and limitations

  • This calculator accepts only positive known quantities. Zero moles, zero molarity, and zero volume are rejected because the requested concentration relation is undefined or uninformative for this tool.
  • It calculates the direct definition M = n/V only; it does not determine moles from mass or a chemical formula.

M = n / V; n = M × V; V = n / M

Learn More

Connect the calculation to your chemistry course and try a related tool.

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Scientific references

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