⭐ Starlight Tools / Molarity Calculator

Free Molarity Calculator - Instant Results

Quick & Easy: Enter any 3 values, get the 4th instantly. No signup required.

In case you were looking for a: Molecular Weight calculator or Dilution Calculator.

=
×
×

*When preparing stock solutions always use the back of the bottle and Certificate of Analysis (CoA) for M. Wt.

Result will appear here...

Mass (g) = Concentration (mol/L) × Volume (L) × Molecular Weight (g/mol)

Understanding Molarity

Molarity (M) expresses the amount of solute (in moles) per litre of solution and is the concentration unit most commonly used in analytical chemistry [1].

The core relationship is mass (g) = M (mol L-1) × volume (L) × molecular weight (g mol-1), which lets you move cleanly between mass, molarity and volume [2].

Laboratory suppliers such as Sigma-Aldrich provide preparation guides and calculators that align with these definitions and serve as an external cross-check [3].

References

  1. Harris, D. C. & Lucy, C. A. Quantitative Chemical Analysis, 10th ed., W. H. Freeman, 2019. ISBN 978-1319164300.
  2. Oxtoby, D. W., Gillis, H. P. & Butler, L. J. Principles of Modern Chemistry, 8th ed., Cengage Learning, 2016. ISBN 978-1305079113.
  3. MilliporeSigma. “Mass & Molarity Calculator.” Sigma-Aldrich website. Accessed 28 July 2025.