Enter the ppm and the molar mass of a substance into the calculator to determine the molarity. This calculator can also convert molarity to PPM.

PPM to Molarity Calculator

Enter any 2 of: PPM, Molar Mass, Molarity to solve the 3rd. Choose the PPM basis; density is only used for mg/kg.

Calculator Operations Required Inputs
Convert Molarity and Molar Mass to PPM Molarity, Molar Mass
Convert PPM and Molar Mass to Molarity PPM, Molar Mass
Convert PPM and Molarity to Molar Mass PPM, Molarity

PPM to Molarity Formula

The following equation is used to convert PPM to molarity.

M = PPM/ mm / 1000
  • Where M is the molarity
  • mm is the molar mass (g/mol)
  • PPM is the parts

To calculate molarity from ppm, divide the PPM by the molar mas (g/mol), then divide the result by 1000.

PPM (mg/L) to Molarity Conversion Table — Sodium chloride (NaCl), MW = 58.443 g/mol; aqueous basis (ρ = 1.000 g/mL)
PPM (mg/L) Molarity (mmol/L)
0.10.002
0.50.009
10.017
20.034
50.086
100.171
250.428
500.856
751.283
1001.711
1502.567
2003.422
2504.278
3005.133
4006.844
5008.555
75012.833
100017.111
150025.666
200034.221
* Rounded to 3 decimals. Assumes NaCl (MW = 58.443 g/mol). For aqueous mg/L: mmol/L ≈ ppm ÷ 58.443; mol/L = mmol/L ÷ 1000.

PPM to Molarity Conversion

The conversion of PPM to molarity involves using the molar mass along with the equation above to calculate molarity.

PPM to Molarity Example

How to convert PPM to molarity?

  1. First, determine the PPM.

    Calculate the total parts per million of the solution or substance.

  2. Next, determine the molar mass.

    Measure or calculate the molar mass in g/mol.

  3. Finally, calculate the molarity.

    Calculate the molarity with the equation above.

FAQ

What is molar mass?

Molar mass is a measure of the total mass per mol of substance.