Gallons to Cubic Feet Conversion (gal to ft³)

Gallons to Cubic Feet Converter

Enter the volume in gallons below to convert it to cubic feet.

Result in Cubic Feet:

1 gal = 0.133681 ft³

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

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

References

National Institute of Standards and Technology, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices, Handbook 44 - 2019 Edition, https://nvlpubs.nist.gov/nistpubs/hb/2019/NIST.HB.44-2019.pdf