Convert part per million (ppm) to milligram per liter instantly. Type in either field — results update live.
Selected ppm values converted to mg/L using the exact factor from this tool.
| ppm | mg/L |
|---|---|
| 0.01 | 0.01 |
| 0.1 | 0.1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 5 | 5 |
| 10 | 10 |
| 20 | 20 |
| 50 | 50 |
| 100 | 100 |
| 1,000 | 1,000 |
Exact conversion factors in both directions, plus a worked example.
1 ppm = 1 mg/L
1 mg/L = 1 ppm
To convert part per million (ppm) to milligram per liter, multiply by 1.
To convert milligram per liter to part per million (ppm), multiply by 1.
Example: convert 10 ppm to mg/L
10 × 1 = 10 mg/L
Short background on the units used in this conversion.
Part per million (ppm) equals 10⁻⁶ kg/L by mass fraction. For dilute aqueous solutions with density approximately 1 kg/L, ppm equals mg/L.
Parts per million express trace contaminants in water, air, and food. The ppm = mg/L equivalence assumes near-unit density of the solvent.
Milligram per liter equals 10⁻⁶ kg/L — used for trace concentrations in water and environmental monitoring.
Milligrams per liter report drinking-water contaminants, dissolved metals, and low-level chemical concentrations.
mg/L = ppm × 1ppm = mg/L × 1, using the same exact factors as this converter.Jump to any concentration-solution conversion starting from part per million (ppm) — including the reverse direction and every other unit in our dataset.