# mg/L to PPM Converter

Convert a concentration in milligrams per liter to parts per million using the converter below.

## Parts per Million:

## 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 ÷ ρ_{g/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.