Convert Gallons to Cubic Feet

Enter the volume in gallons below to get the value converted to cubic feet.

Results in Cubic Feet:
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1 gal = 0.133681 ft³

How to Convert Gallons to Cubic Feet

Calculators can be used to convert measurements from one unit to another

To convert a gallon measurement to a cubic foot measurement, multiply the volume by the conversion ratio. One gallon is equal to 0.133681 cubic feet, so use this simple formula to convert:

cubic feet = gallons × 0.133681

The volume in cubic feet is equal to the gallons multiplied by 0.133681.

For example, here's how to convert 5 gallons to cubic feet using the formula above.
5 gal = (5 × 0.133681) = 0.668403 ft³

Gallons and cubic feet are both units used to measure volume. Keep reading to learn more about each unit of measure.


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. Gallons can be abbreviated as gal, for example 1 gallon can be written as 1 gal.

Cubic Feet

The cubic foot is a unit of volume that is equal to the space consumed by a cube having sides one foot on each edge.

The cubic foot is a US customary and imperial unit of volume. A cubic foot is sometimes also referred to as a cubic ft. Cubic feet can be abbreviated as ft³, and are also sometimes abbreviated as cu foot, cu ft, or CF. For example, 1 cubic foot can be written as 1 ft³, 1 cu foot, 1 cu ft, or 1 CF.

Try our cubic footage calculator to calculate the volume of a space.

Gallon Measurements and Equivalent Cubic Foot Conversions

Common gallon values converted to the equivalent cubic foot value
Gallons Cubic Feet
1 gal 0.133681 ft³
2 gal 0.267361 ft³
3 gal 0.401042 ft³
4 gal 0.534722 ft³
5 gal 0.668403 ft³
6 gal 0.802083 ft³
7 gal 0.935764 ft³
8 gal 1.0694 ft³
9 gal 1.2031 ft³
10 gal 1.3368 ft³
11 gal 1.4705 ft³
12 gal 1.6042 ft³
13 gal 1.7378 ft³
14 gal 1.8715 ft³
15 gal 2.0052 ft³
16 gal 2.1389 ft³
17 gal 2.2726 ft³
18 gal 2.4063 ft³
19 gal 2.5399 ft³
20 gal 2.6736 ft³
21 gal 2.8073 ft³
22 gal 2.941 ft³
23 gal 3.0747 ft³
24 gal 3.2083 ft³
25 gal 3.342 ft³
26 gal 3.4757 ft³
27 gal 3.6094 ft³
28 gal 3.7431 ft³
29 gal 3.8767 ft³
30 gal 4.0104 ft³
31 gal 4.1441 ft³
32 gal 4.2778 ft³
33 gal 4.4115 ft³
34 gal 4.5451 ft³
35 gal 4.6788 ft³
36 gal 4.8125 ft³
37 gal 4.9462 ft³
38 gal 5.0799 ft³
39 gal 5.2135 ft³
40 gal 5.3472 ft³

More Gallon Volume Conversions

US Liquid
Convert to Quarts
1 gal is equal to 4 quarts
Convert to Pints
1 gal is equal to 8 pints
Convert to Fluid Ounces
1 gal is equal to 128 fluid ounces
US Cooking
Convert to Cups
1 gal is equal to 16 cups
Convert to Tablespoons
1 gal is equal to 256 tablespoons
Convert to Teaspoons
1 gal is equal to 768 teaspoons
US Customary Volume
Convert to Cubic Inches
1 gal is equal to 231 cubic inches
Convert to Cubic Yards
1 gal is equal to 0.004951 cubic yards
Metric Volume
Convert to Liters
1 gal is equal to 3.785412 liters
Convert to Milliliters
1 gal is equal to 3,785.41 milliliters
Convert to Cubic Centimeters
1 gal is equal to 3,785.41 cubic centimeters
Convert to Cubic Meters
1 gal is equal to 0.003785 cubic meters