What is bigger than a gallon?
The liquid quart should not be confused with the dry quart (US) or the imperial quart, which are different units. The quart is a US customary unit of volume. Quarts can be abbreviated as qt; for example, 1 quart can be written as 1 qt.
The US liquid gallon is a unit of fluid volume equal to four quarts, eight pints, or sixteen cups.  The US liquid gallon should not be confused with the US dry gallon or the imperial gallon, which are different units of measure. The gallon is a US customary unit of volume.
A U.S. quart is equal to 32 U.S. fluid ounces, 1/4th of a gallon, or 2 pints. It should not be confused with the Imperial quart, which is about 20% larger. A U.S. gallon is a unit of volume equal to 128 U.S. fluid ounces, or about 3.785 liters.
One gallon is equal to 4 quarts, so use this simple formula to convert: The volume in quarts is equal to the gallons multiplied by 4. For example, here’s how to convert 5 gallons to quarts using the formula above. Gallons and quarts are both units used to measure volume.
The unit conversion between (American) gallons and liters is 1 gallon = 3.785 liters. British and American gallons are not the same. The American gallon is a smaller unit of volume and has a different conversion factor. There are about four liters per gallon.
A gallon is a unit of measurement that is larger than a quart, pint, and cup. With some assistance they can pour 4 quarts into the gallon container to understand that 4 quarts are equal to 1 gallon. Since there are 2 pints in a quart, there are 8 pints in a gallon.
Using your measuring cup, your mathematical knowledge, and your cooperation skills, please create a complete class conversion chart on the board from the smallest measure we will use today, the fluid ounce, all the way up to our largest measure, which will be 1 gallon.
The Americans had adopted a system where a gallon was comprised of 231 cubic inches of water. As a result, the U.S. gallon is 83.3 per cent of the Imperial gallon; put it another way, the Imperial gallon is about one-fifth or 20 per cent greater in volume than the American gallon.
Answer: 4 quarts constitute for 1 gallon.
One gallon (gal) is the basic unit of liquid measure. A barrel is equal to 31.5 gallons, and a hogshead is 63 gallons (or two barrels).