Molarity Calculator
Solve for molarity, mass or volume of a solution.
Assumptions used in this calculation
- Volume is total solution, not solvent: Volume refers to the final total solution volume after the solute is dissolved and topped up, not the volume of solvent added before mixing, consistent with the standard molarity definition (mol/L of solution).
- Complete dissolution at room temperature: Assumes the solute fully dissolves and the solution is measured near 25°C; molarity of a fixed mass will change with temperature because liquid volume expands or contracts.
About this calculator
Preparing a solution of a specific concentration in a lab means juggling three related quantities, how much solute to weigh out, how much solvent to dilute it in, and the resulting concentration, and getting any one wrong by even a small amount can throw off a titration, a buffer, or an experimental result downstream. This calculator solves the molarity relationship (molarity = moles of solute ÷ litres of solution, where moles = mass ÷ molar mass) for whichever value you need: find the molarity of a solution from a known mass and volume, calculate how much solute to weigh out for a target molarity and volume, or determine what volume a given mass will produce at a target concentration. It's built for chemistry students and lab technicians preparing reagents, standardizing solutions, or checking a recipe before mixing, saving the manual algebra of rearranging the formula and converting mass to moles by hand each time.
Worked example
58.44g NaCl in 1L
Result: 1 mol/L
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