How many litr for 1 gallon?

There are approximately 3.78541 liters in one gallon. This conversion is based on the international standard for the gallon, known as the US liquid gallon, which is equivalent to 3.78541 liters. It is important to note that there are different types of gallons, such as the US dry gallon and the UK gallon, which have slightly different conversions to liters.