mg/L to ppm converter

Convert mass per volume to mass-based ppm using the solution’s density.

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Concentration

Direction

Solution density (kg/L)

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More options and calculation details

The density sample is an arithmetic example, not a measured property of water or another liquid. Use density for the solution at the relevant temperature.

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Updated 2026-09-19

How this conversion works

Mass-based ppm means milligrams of solute per kilogram of solution. mg/L instead divides by solution volume.

Divide mg/L by solution density in kg/L to get ppm by mass. Multiply ppm by density to get mg/L. The familiar one-to-one relationship applies only when density is 1 kg/L.

Next: PPM converter

A worked example

10 mg/L ÷ 1.2 kg/L = about 8.333333333 ppm by mass.

Next: Density converter

Before you use the result

This is mass fraction, not mole fraction, gas ppm by volume or a dosing recommendation. The density must describe the whole solution. Nonzero numeric inputs for these compound calculations are limited to 1e-40 through 1e40.

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ToolOctopus. “mg/L to ppm converter.” Updated 2026-09-19. https://tooloctopus.com/mgl-ppm-converter.

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