PPM ↔ Molarity Calculator

PPM ↔ Molarity Conversion

PPM (parts per million) and molarity (mol/L) are both units of concentration. PPM expresses concentration as milligrams of solute per liter of solution (mg/L), while molarity expresses it as moles of solute per liter of solution.

Formulas

PPM to Molarity: Molarity (M) = (PPM × Density) / (Molecular Weight × 1000)
- Where:
  - Density is typically 1 g/mL for aqueous solutions.
  - Molecular Weight is in g/mol.
Molarity to PPM: PPM = (Molarity × Molecular Weight × 1000) / Density

Calculations

For Aqueous Solutions (Density ≈ 1 g/mL):
- PPM to Molarity: M = PPM / Molecular Weight / 1000
- Molarity to PPM: PPM = M × Molecular Weight × 1000

Examples

Sodium Chloride (NaCl, Molecular Weight ≈ 58.44 g/mol):
- 1000 PPM NaCl to Molarity:
  - M = 1000 / 58.44 / 1000 ≈ 0.0171 M
- 0.1 M NaCl to PPM:
  - PPM = 0.1 * 58.44 * 1000 = 5844 PPM
Glucose (C6H12O6, Molecular Weight ≈ 180.16 g/mol):
- 500 PPM Glucose to Molarity:
  - M = 500 / 180.16 / 1000 ≈ 0.00277 M
- 0.05 M Glucose to PPM:
  - PPM = 0.05 * 180.16 * 1000 = 9008 PPM