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PPM to Molarity Conversion Calculator
Parts per million (ppm) and molarity are two units of measurement used to describe the concentration
of a chemical solution.
PPM represents the number of molecules of solute per million parts of a solution. It is calculated as the
ratio of the mass of the solute to the mass of the solution, multiplied by one million. It is usually
expressed in units of mg/L or μg/mL.
Molarity is a measure of the number of molecules or ions of the solute present in a given volume of the
solution. The molarity of a solution is calculated by dividing the number of moles of solute by the
volume of the solution in liters. In chemistry, molarity is commonly used to prepare solutions of specific
concentrations for various reactions and experiments. It is expressed in units of mol/L or M.
In some cases, it may be necessary to convert between PPM and molarity in order to compare different
types of solutions or to carry out calculations in chemical reactions.
Equation
parts per million (mg/L)
=
molarity (mol/L)
×molar mass (g/mol)
×1000
Inputs
| parts per million (mg/L): | |
| molarity (mol/L): | |
| molar mass (g/mol): |
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References
This online resource may be cited as follows
MLA | "Quest Calculate™ PPM to Molarity Conversion Calculator." AAT Bioquest, Inc., 15 Sep. 2026, https://www.aatbio.com/tools/solve-equation-calculator/ppm-to-molarity. | |
APA | AAT Bioquest, Inc. (2026, September 15). Quest Calculate™ PPM to Molarity Conversion Calculator. AAT Bioquest. https://www.aatbio.com/tools/solve-equation-calculator/ppm-to-molarity. | |
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