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PPM ↔ mg/L Conversion Calculator

For dilute aqueous solutions ρ ≈ 1 g/mL, so 1 ppm ≈ 1 mg/L.

Convert between parts-per-million (ppm) by mass and mg/L for an aqueous solution of given density: mg/L = ppm · density_g_per_mL. For dilute solutions ρ ≈ 1.000 g/mL and the two scales are numerically equal.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

ppm
g/mL

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

mg/L = ppm · density_g_per_mL

In depth

Convert between parts-per-million (ppm) by mass and mg/L for an aqueous solution of given density: mg/L = ppm · density_g_per_mL. For dilute solutions ρ ≈ 1.000 g/mL and the two scales are numerically equal.