🧪Concentration Converter

Enter the solute's molar mass and solution density, then a concentration in any unit, to convert to the rest.

Solute Molar Mass (g/mol)

Solution Density (g/mL)

Concentration Value

Unit

Free Concentration Converter

This concentration converter switches between the four most common ways chemists express concentration: molarity (mol/L), molality (mol/kg solvent), mass percent (%), and parts per million (ppm). Because these units measure different physical quantities, converting between them requires the solute's molar mass and — for molarity — the solution's density.

Enter your known concentration in any one unit, along with molar mass and density, and the calculator computes the equivalent value in all three other units simultaneously. All conversions route through mass percent as a common intermediate.

Useful for lab work, solution prep, and coursework switching between concentration conventions. Free, runs entirely in your browser.