PPM Calculator

Convert between parts-per-million and mass of solute / solution

What do you know?

1 ppm = 1 part solute per 1,000,000 parts solution (≈ mg/L for dilute aqueous solutions).

For dilute aqueous solutions, 1 mL ≈ 1 g.

Quick Reminders

  • For water-based solutions, ppm ≈ mg of solute per liter of solution.
  • Always use the same units for solute and solution mass before taking the ratio.
  • For gases, ppm often refers to volumes; this tool assumes masses/liquids.