Cups in a gallon

There are 16 cups (C) in 1 gallon (gal) in the US customary and imperial systems of measurement.

Cup to gallon converter

The following converter can be used to convert from cups to gallons or gallons to cups. Just enter a value in either cups or gallons to convert between the two.


Convert cups to gallons

To convert between cups to gallons, divide a value in cups by 16. To convert a value in gallons to cups, multiply by 16. Note that this conversion works for cups and gallons within the same system of measurement. 1 US gallon is not equal to 16 imperial cups. If we were trying to convert these, we would need to convert the US cup to an imperial cup before applying the conversion above.

How many cups in a gallon

There are 16 cups in 1 gallon in both the US customary and imperial systems of measurement. Below are some cups to gallons and gallons to cups conversion examples.


1. Convert 12 cups to gallons:

12 C ÷ 16 = 0.75 gal

2. Convert 2.3 gallons to cups:

2.3 gal × 16 = 36.8 cups

What is a cup

A cup is a measurement of volume in the US customary and imperial systems of measurement that is equal to 1/16 of a gallon. Note that since each system has a different definition of a gallon, even though a cup is 1/16 of a gallon in both systems, the actual volume of 16 cups in either system is different. On top of US customary and imperial cups, the US has an additional definition of a cup called a US legal cup.

US customary cup

A US customary cup has the following relationships.

1 US customary cup = gallon
  = quart
  = pints
  = 8 fl oz
  = 236.5882365 mL
  = imperial cups
  = 16.65348369 imperial fluid ounces

US Legal cup

The US legal cup varies slightly in measurement from the US customary cup. This definition is used in the US specifically for nutrition labeling. Unlike the imperial cup and the US customary cup which are based on each system's definition of the gallon, the US legal cup is used as a unit on its own, and "US legal gallons" for example, are not used. A US legal cup has the following relationships:

1 US legal cup = 240 mL
  = 8 US customary fl oz
  = 8.45 imperial fl oz

In relation to the US gallon, there are 15.7725 US legal cups in 1 US gallon.

Imperial cup

An imperial cup has the following relationships.

1 imperial cup = gallon
  = quart
  = pints
  = 10 imperial fl oz
  = 284.131 mL
  = 1.20095 US cups
  = 9.6076 US customary fluid ounces

What is a gallon

A gallon is a measurement of volume in the US customary and imperial systems of measurement. While the relationships between the units within each system are the same, since the definition of the gallon is different, their values are different. The relationships between gallons, quarts, pints, and cups are shown in the table below:

1 cup ½ pint ¼ quart gallon
1 pint 2 cups ½ quart ⅛ gallon
1 quart 4 cups 2 pints ¼ gallon
1 gallon 4 quarts 8 pints 16 cups

Gallon usage

The gallon is mostly used in countries like the United States as well as some other countries in Latin and South America. In these countries, the gallon is commonly used to measure gasoline. The imperial gallon is used in countries like the UK, Canada, Ireland, Australia, and some Caribbean countries.

US gallon vs imperial gallon

The US gallon and the imperial gallon have different measurements, as described below.

US customary gallon

There are two definitions of the gallon in the US customary system: the liquid gallon and the dry gallon.

Liquid gallon

The US liquid gallon is equal to 3.785411784 liters.

Dry gallon

The US dry gallon is equal to 4.40488377086 liters.

Imperial gallon

The imperial gallon only has one definition. There is no distinction between liquid and dry gallons. The imperial gallon is equal to 4.54609 liters, which is larger than the US gallon.

Cups to gallons conversion chart

The table below shows some cups to gallons conversions.

Cup Gallon
0.01 cups 0.000625
0.1 0.00625
1 0.0625
2 0.125
3 0.1875
5 0.3125
10 0.625
20 1.25
50 3.125
100 6.25
1000 62.5