Molarity Calculator
Calculate molar concentration from mass, volume and molar mass, and plan dilutions with the C1V1 = C2V2 formula. Free, instant and browser-based.
關於 Molarity Calculator
The Molarity & Dilution Calculator handles the two calculations that dominate solution preparation. The first converts a mass of solute, its molar mass and a solution volume into molar concentration, along with the number of moles and the mass concentration in grams per litre. The second solves the dilution equation C₁V₁ = C₂V₂.
Molarity is moles of solute per litre of solution, and moles are mass divided by molar mass — so dissolving 58.44 g of sodium chloride (molar mass 58.44 g/mol) in one litre gives exactly 1 mol/L. If you need the molar mass of a compound first, work it out with the Molar Mass Calculator and bring the number back here.
The dilution section answers the everyday bench question: how much stock do I take, and how much solvent do I add, to reach a target concentration? It returns the final volume, the solvent to add and the dilution factor. Volumes are assumed additive, which holds well for dilute aqueous solutions.
如何使用 Molarity Calculator
- Choose whether to calculate molarity from mass, or to plan a dilution.
- For molarity: enter the mass of solute, its molar mass in g/mol and the solution volume in mL.
- Read the molarity, the number of moles and the mass concentration.
- For a dilution: enter the stock concentration, the stock volume and the target concentration.
- Read the final volume, the solvent to add and the dilution factor.