Convert between mass, moles, and concentration, and calculate stock dilutions. Everything runs in your browser — nothing is sent anywhere. Leave one field blank to solve for it, or fill mass/MW/volume to compute concentration directly.
Mass ↔ Molarity
mass = concentration × volume × molecular weight
g/mol
Fill in molecular weight plus any two of concentration, volume, mass.
Leave exactly one of concentration / volume / mass blank and it will be solved for.
Stock Dilution (C₁V₁ = C₂V₂)
How much stock and diluent to make a solution
Enter stock conc., final conc., and final volume.
Concentration units must be compatible (molar with molar, or X with X).