Unit Conversion

Convert numbers between two units quickly and precisely

Mass Concentration Converter

Unit Conversion

Convert mass concentration: g/l, mg/l, and ppm

Mass concentration states how much mass of a dissolved substance is contained in a given volume of solution. It's stated in grams, milligrams, or micrograms per liter, milliliter, or microliter, supplemented by parts per million (ppm) and percent for dilute aqueous solutions.

Note: The conversion between mass figures, ppm, and percent is exact only for aqueous solutions with a density of about 1 kg/l. For other liquids, it depends on the specific density.

Key conversion factors:

  • 1 gram per liter (g/l) = 1,000 milligrams per liter (mg/l)
  • 1 mg/l ≈ 1 ppm (aqueous solutions only)
  • 1% = 10 g/l ≈ 10,000 ppm (aqueous solutions only)

Applications:

  • Analytical chemistry: concentration figures for solutions and reagents
  • Water analysis: pollutant concentration in mg/l or ppm, drinking water quality
  • Pharmaceuticals: active ingredient concentration in infusion solutions
  • Environmental analysis: air and soil pollutants in µg/l and ppm

The mass concentration converter supports interpreting lab values and assessing water quality. For dilution calculations using c₁·V₁ = c₂·V₂, use the dilution calculator; for molar rather than mass concentration, the molar concentration converter.

Frequently asked questions about converting mass concentration

Approximately yes, but only for aqueous solutions with a density of about 1 kg/l – in that case, 1 mg/l roughly equals 1 ppm. For liquids with a different density (e.g. oil), this equivalence no longer holds exactly.

1% equals 10,000 ppm (parts per million), since "percent" means 1 part in 100 and "ppm" means 1 part in 1,000,000. For aqueous solutions, that equals about 10 g/l.

Mass concentration (g/l) is practical when you're weighing a substance and don't know or don't need its molar mass – for example in environmental measurements or nutrient figures. Molar concentration (mol/l), on the other hand, is needed for stoichiometric calculations where the number of particles matters.