# PPM to mg/L Converter

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

## Milligrams per Liter:

## 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 × ρ_{g/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.