Milligram per Liter (mg/L)
The milligram per litre (mg/L) is a mass concentration, 0.001 kg/m³. In dilute water solutions it is roughly equal to parts per million (ppm) by mass.
Symbol: mg/L
Quantity: density (mass per unit volume) and mass concentration
SI relation: 1 mg/L = 0.001 kg/m³ (exact)
Derivation: 1 mg/L = 10⁻⁶ kg ÷ 10⁻³ m³ = 10⁻³ kg/m³
Exact: yes, by definition
Typical uses
- Water quality (dissolved oxygen, nitrate, chlorine)
- Drug and blood concentrations
- Wastewater and effluent limits
Convert milligrams per liter to other units
| Conversion | 1 mg/L equals | Reverse |
|---|---|---|
| milligram per liter to kilogram per cubic meter | 0.001 kg/m³ | kilogram per cubic meter to milligram per liter |
| milligram per liter to gram per cubic centimeter | 0.000001 g/cm³ | gram per cubic centimeter to milligram per liter |
| milligram per liter to pound per cubic foot | 0.00006242796058 lb/ft³ | pound per cubic foot to milligram per liter |
| milligram per liter to pound per gallon | 0.000008345404452 lb/gal | pound per gallon to milligram per liter |
| milligram per liter to kilogram per liter | 0.000001 kg/L | kilogram per liter to milligram per liter |
| milligram per liter to gram per liter | 0.001 g/L | gram per liter to milligram per liter |
| milligram per liter to pound per cubic inch | 3.6127292 × 10⁻⁸ lb/in³ | pound per cubic inch to milligram per liter |
Open the Density Converter to convert any value between all units.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 8 (litre) with SI prefix milli.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Milligram per Liter (mg/L). Retrieved October 17, 2026, from https://scientificconverters.com/units/milligram-per-liter/
IEEE
Scientific Converters, "Milligram per Liter (mg/L)," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/units/milligram-per-liter/