mg/L to PPM Converter
Convert a concentration in milligrams per liter to parts per million using the converter below.
Parts per Million:
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How to Convert mg/L to PPM
Milligrams per liter (mg/L) and parts per million (ppm) measure the concentration of a substance in a solution or mixture.
Milligrams per liter expresses the concentration as a ratio of the mass of the substance to the volume of solution, while parts per million expresses the concentration as a ratio of the number of particles of substance to the particles of solution.
To convert a concentration in mg/L to ppm, you’ll need the density of the solute and the formula below.
mg/L to PPM Formula
The formula to convert milligrams per liter to parts per million is:
ppm = mg/L ÷ ρg/mL
Thus, to convert a concentration in milligrams per liter to parts per million, divide the concentration in mg/L by the density ρ of the solute in grams per milliliter. You can multiply the concentration by the density to convert ppm to mg/L.
For example, let’s convert 25 mg/L of a substance in isopropanol, which has a density of 0.785 g/mL, to parts per million. Substitute 25 mg/L and 0.785 g/mL in the formula above to solve.
25 mg/L ÷ 0.7845 g/mL = 31.847 ppm
Thus, a concentration of 25 mg/L ppm of a substance in isopropanol is equivalent to 31.847 ppm.
You might also like our ppm converter to convert concentrations in parts per million to other measurements.