Back to Home How to use FAQ

Molarity Calculator

Single-solute mode in this free online molarity calculator handles mass, molarity, final-volume and g/L calculations, and liquid acid stocks; protein mode adds kDa-based protein molarity conversions, while multi-solute mode builds lab recipes and stock-multiplier amounts.

Molarity calculator inputs
Calculator mode
Calculation mode
Liquid acid stock
% w/w
g/mL

Offline compound search includes 0 common salts, buffers, sugars, and reagents. Confirm the exact salt, hydrate, and molecular weight against your bottle label.

g/mol

References

References for molarity calculator logic: amount concentration, molecular weight, mass-to-molarity conversions, protein molarity conversions, PubChem compound data checks, and liquid acid stock assay/density defaults. Mol Biology Tools implementation code is original.

  1. Molarity, amount concentration, and unit terminology: IUPAC Green Book.
  2. Molecular formula and molecular-weight checks: PubChem Compound database.
  3. PubChem database citation: Kim et al. (2016), PubChem Substance and Compound databases.
  4. Liquid-acid assay and density defaults: NIOSH Pocket Guide / PubChem and supplier SDS values.