Milligram per liter (mg/L)

One milligram per liter: exactly 0.001 kg/m³. Used for water quality. In dilute water solutions it is close to 1 ppm.

What is a milligram per liter?

Symbol: mg/L
Quantity: Solution Concentration
Unit system: SI-accepted
Definition: One milligram per liter: exactly 0.001 kg/m³. Used for water quality. In dilute water solutions it is close to 1 ppm.
Exact: Yes, the value is exact by definition
Source: SI Brochure, 9th edition (BIPM, 2019)

Used in water quality reports for minerals, nitrate, chlorine and dissolved oxygen.

Milligram per liter in other units
Milligram per liter	Microgram per liter	Milligram per deciliter	Percent weight per volume
1 mg/L	= 1000 µg/L	= 0.1 mg/dL	= 0.0001 % w/v
10 mg/L	= 10000 µg/L	= 1 mg/dL	= 0.001 % w/v
100 mg/L	= 100000 µg/L	= 10 mg/dL	= 0.01 % w/v
1000 mg/L	= 1000000 µg/L	= 100 mg/dL	= 0.1 % w/v

The next smaller solution concentration unit is the microgram per liter (µg/L). 1 mg/L = 1000 µg/L, and 1 µg/L = 0.001 mg/L.

The next larger solution concentration unit is the milligram per deciliter (mg/dL). 1 mg/L = 0.1 mg/dL, and 1 mg/dL = 10 mg/L.

How many micrograms per liter are in one milligram per liter?: One milligram per liter = 1000 µg/L (micrograms per liter).
How many milligrams per deciliter are in one milligram per liter?: One milligram per liter = 0.1 mg/dL (milligrams per deciliter).
How many percent weight per volume are in one milligram per liter?: One milligram per liter = 0.0001 % w/v (percent weight per volume).