Converting liters into kilometers is not possible, as liters are used to measure volume while kilometers are used to measure distance. Liters may be converted into other volume measurements such as gallons or cubic meters.
It is possible to convert liters into kiloliters since they are both units of volume measurement. "Kilo-" is an official SI prefix and modifies the base volume unit of a liter by a factor of 1,000. Therefore, 1 kiloliter equals 1,000 liters. Other SI prefixes modify base units of measure by different factors; 1 milliliter represents a thousandth of a liter. To illustrate the use of prefixes with distance measurements, 1,000 meters are equivalent to 1 kilometer.