How Many Liters in a Gallon of Water

1 US gallon = 3.7854118 liters

1 Imperial gallon = 4.54609 liters

also 1 Liter = 0.26417 Gallons

The gallon is a common unit of liquid measure though it can also be used to determine volume of some dry substances. The literis a unit of volume from the metric system. This difference may cause problems in converting gallons to liters and vice versa. There are several definitions of the gallon. But if we mean US liquid gallons, the answer to the question, “How many liters are there in one gallon?” is following:

  • One US gallon consists of 3.785 liters.

US liquid gallons are mostly spread in the USA, though they are also used for measuring fuel in many other countries, like Colombia, Ecuador, Haiti, Panama, Nicaragua, Peru, etc. The US dry gallon is rarely used and has about 4.404 liters.

Differences between US Gallons and Imperial Gallons

But don’t forget that there is also the imperial (European, UK) gallon, which differs from the US variant. It is a part of the Standard system of measures, which is used in several countries for a long time. The imperial gallon is defined as 4.546 liters, which is more than the US gallon has. This definition comes from the volume of ten pounds of water measures at the temperature of 62°farehnheit. From 2000, it is not a legal measurement unit anymore in the UK.

Converting Gallons and Liters


As stated above, one US gallon consists of about 3.785 liters. It means that to convert metric liters to US liquid gallons, you should multiply liters by 0,264. If you want to know how many liters are in some number of gallons, you need to multiply gallons by 3.785.

See also  How Many Centimeters Are in a Meter

The table below will help you to convert gallons and liters to other units of volume. Remember that we are discussing liquid measures accepted in the USA.

Tea-spoons Table-spoons Fluid Ounces Cups Pints Quarts
One US Gallon 768 256 128 16 8 4
One Liter 202.88 67.62 33.81 4.22 2.11 1.05


  1. The Gallon is a volume measurement unit accepted in many countries. The US liquid gallon equals approximately 3.785 liters, the imperial gallon has about 4.546 liters, and the US dry gallon consists of 4.404 liters. Gallons (imperial and US) are common for many English speaking countries and can also be found in Latin America.
  2. The Liter (British English: litre; abbr. L or l) is the basic volume measurement unit in the metric system. It equals to one cubic decimeter (dm3), or one thousand cubic centimeters (cm3). One liter of pure cold water weighs approximately one kilogram. It comes from the year of 1795, when 1 gram was defined as 1 cm3 of water.