How many 2 liters in a half gallon?

1 US gallon = 3.78541178 liters.

1 UK (Imperial) gallon = 4.54609118 liters.

3.78541178 liters / 2 liters = 1.89

4.54609118 liters / 2 liters = 2.27

There are 1.89 - 2 liters in a US half gallon and 2.27 - 2 liters in an imperial half gallon.