PPM to Milligrams Per Liter Converter

PPM to Milligrams per Liter Converter

This converter translates parts per million (ppm) into milligrams per liter (mg/L) and molarity (mol/L). PPM is widely used for dilute solution concentrations, while mg/L is common in water quality and environmental testing. Molarity is essential for stoichiometry and lab work.

Conversion Formulas

For a solute with density $\rho$ in kg/m³, ppm converts to mg/L as:

$$ \text{mg/L} = \frac{\text{ppm} \times \rho}{1000} $$

To find molarity from mg/L, divide by molar mass and 1,000:

$$ M = \frac{\text{mg/L}}{MM \times 1000} $$

where $MM$ is molar mass in g/mol. For dilute aqueous solutions where density is about 1,000 kg/m³, 1 ppm is approximately 1 mg/L. For other solutes like oil or salt, density affects the mg/L result.

Using Solute Presets

Select a preset solute (water, sodium chloride, oil, ethanol) or enter custom density and molar mass. The tool calculates mg/L and molarity together so you can compare mass-based and mole-based concentrations.

For broader unit conversions between percent, ppm, ppb, and ppt, use the PPM Calculator.