PPM to Molarity Calculator

Convert parts per million (ppm) to molarity (mol/L) — and back. Enter your values below for instant results.

PPM → Molarity
ppm
g/mol
Common Substances
↓
— mol/L
Formula: Molarity (mol/L) = PPM ÷ (Molar Mass × 1000)
Where PPM is in mg/L and Molar Mass is in g/mol
OR
Molarity → PPM
mol/L
g/mol
Common Substances
↓
— ppm (mg/L)
Formula: PPM = Molarity × Molar Mass × 1000
Result is in mg/L (equivalent to ppm in aqueous solution)

PPM to Molarity Reference Table — NaCl (Molar Mass: 58.44 g/mol)

PPM (mg/L) Molarity (mol/L) Millimolar (mmol/L)
1 ppm0.00001711 mol/L0.01711 mmol/L
5 ppm0.00008556 mol/L0.08556 mmol/L
10 ppm0.00017112 mol/L0.17112 mmol/L
50 ppm0.00085558 mol/L0.85558 mmol/L
100 ppm0.00171116 mol/L1.71116 mmol/L
250 ppm0.00427789 mol/L4.27789 mmol/L
500 ppm0.00855578 mol/L8.55578 mmol/L
1,000 ppm0.01711157 mol/L17.11157 mmol/L
2,000 ppm0.03422313 mol/L34.22313 mmol/L
5,000 ppm0.08555784 mol/L85.55784 mmol/L
10,000 ppm0.17111567 mol/L171.11567 mmol/L
50,000 ppm0.85557837 mol/L855.57837 mmol/L
ⓘ Important: PPM to Molarity conversion always requires the molar mass of the dissolved substance. Without it, the calculation is not possible. PPM (parts per million) in aqueous solutions equals mg/L. Molarity is mol/L — the number of moles of solute per litre of solution.
PPM to Molarity Conversion Calculator