Gallons to Cubic Feet Converter

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


Result in Cubic Feet:

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1 gal = 0.133681 ft³

Do you want to convert cubic feet to gallons?

How to Convert Gallons to Cubic Feet

To convert a measurement in gallons to a measurement in cubic feet, multiply the volume by the following conversion ratio: 0.133681 cubic feet/gallon.

Since one gallon is equal to 0.133681 cubic feet, you can use this simple formula to convert:

cubic feet = gallons × 0.133681

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

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

How Many Cubic Feet Are in a Gallon?

There are 0.133681 cubic feet in a gallon, which is why we use this value in the formula above.

1 gal = 0.133681 ft³

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

What Is a Gallon?

The US liquid gallon is a unit of fluid volume equal to four quarts, eight pints, or sixteen cups.[1] 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.

Learn more about gallons.

What Is a Cubic Foot?

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.

You can calculate volume using a cubic footage calculator if you have the dimensions of a space or object.

Learn more about cubic feet.

Gallon to Cubic Foot Conversion Table

Table showing various gallon measurements converted to cubic feet.
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


  1. National Institute of Standards and Technology, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices, Handbook 44 - 2019 Edition,

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