PPM to mg/L Converter
Convert a concentration in parts per million to milligrams per liter using the converter below.
Milligrams per Liter:
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How to Convert PPM to mg/L
Parts per million (ppm) and milligrams per liter (mg/L) are units that measure the concentration of a substance in a solution or mixture.
Parts per million is an expression of the concentration as a ratio of the number of particles of substance to the particles of solution, while milligrams per liter is an expression of the concentration as a ratio of the mass of the substance to the volume of solution.
To convert a concentration in ppm to mg/L, you need the density of the solute and a simple formula.
PPM to mg/L Formula
The formula to convert parts per million to milligrams per liter is:
mg/L = ppm × ρg/mL
So, to convert parts per million to milligrams per liter, multiply the concentration in ppm by the density ρ of the solute in grams per milliliter. You can divide the concentration by the density to convert mg/L to ppm.
For example, let’s convert 5 ppm of a substance in acetone, which has a density of 0.7845 g/mL, to milligrams per liter. Substitute 5 ppm in the formula above to solve.
5 ppm × 0.7845 g/mL = 3.9225 mg/L
Thus, a concentration of 5 ppm of a substance in acetone is equivalent to 3.9225 mg/L.
You might be interested in using our ppm converter to convert a concentration in parts per million to other measurements.