Concentration Calculator
Convert between molarity, molality, mass percent, and mole fraction.
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Enter the molarity of your solution, the molar mass of the solute, and the density of the solution. The calculator converts to mass percent, molality, and mole fraction using standard conversion formulas.
About the Concentration Calculator
Chemistry uses several concentration units depending on the context. Molarity (mol/L) is most common for lab work, molality (mol/kg) for colligative properties, mass percent for industrial formulations, and mole fraction for thermodynamic calculations. This tool converts between them using the solution density as a bridge.
Frequently Asked Questions
Why do I need solution density for conversion?
Molarity is volume-based while molality and mass percent are mass-based. Density bridges the gap between volume and mass, making conversion possible.
What solvent does this calculator assume?
This calculator assumes water (molar mass 18.015 g/mol) as the solvent for mole fraction calculations. For other solvents, the mole fraction result would differ.
How accurate are these conversions?
The conversions are mathematically exact given the input values. Accuracy depends on knowing the correct solution density, which varies with concentration and temperature.