Cubic Feet to Gallons (US) Calculator

This calculator converts cubic feet (ft³) to US gallons (gal). Enter a value in cubic feet to get the equivalent in gallons.

Cubic Feet (ft³)

Result:

0 US gallons

Conversion Formula:

To convert from cubic feet to US gallons, use the following formula:

US Gallons = Cubic Feet × 7.48052

This is because 1 cubic foot equals exactly 7.48052 US gallons.

Interactive Visualization

1 Cubic Foot

→

7.48052 US Gallons

Use this handy reference table for quick conversions from cubic feet to US gallons:

Cubic Feet (ft³)	US Gallons (gal)

Understanding cubic feet to gallons conversion is useful in many real-world scenarios:

Water tanks are often rated in gallons, but dimensions might be given in feet. For example, a rectangular tank with dimensions 4 ft × 3 ft × 2 ft:

Volume in cubic feet = 4 × 3 × 2 = 24 ft³

Volume in US gallons = 24 × 7.48052 = 179.53 gallons

When filling a swimming pool, you need to know how many gallons of water are required. If a pool measures 16 ft × 32 ft with an average depth of 5 ft:

Volume in cubic feet = 16 × 32 × 5 = 2,560 ft³

Volume in US gallons = 2,560 × 7.48052 = 19,150 gallons

Aquariums are commonly rated in gallons. If you have measurements in inches, convert to feet first, then to gallons:

An aquarium measuring 48″ × 24″ × 24″

In feet: 4 ft × 2 ft × 2 ft = 16 ft³

In US gallons = 16 × 7.48052 = 119.69 gallons

Fuel tanks often have their capacity listed in gallons, but the physical dimensions might be in feet:

A cylindrical fuel tank with radius 1.5 ft and height 6 ft:

Volume in cubic feet = π × (1.5)² × 6 = 42.41 ft³

Volume in US gallons = 42.41 × 7.48052 = 317.26 gallons

Cubic Foot (ft³)

A cubic foot is a unit of volume in the imperial and US customary systems. It represents the space occupied by a cube with sides of 1 foot in length.

1 cubic foot = 1,728 cubic inches
1 cubic foot = 0.037037 cubic yards
1 cubic foot = 28.3168 liters
1 cubic foot = 7.48052 US gallons

US Gallon (gal)

A US gallon is a unit of volume used primarily in the United States. It’s commonly used for measuring liquid volumes like water, fuel, and milk.

1 US gallon = 231 cubic inches
1 US gallon = 0.133681 cubic feet
1 US gallon = 3.78541 liters
1 US gallon = 0.83267 imperial gallons

Important Notes

US gallons are different from UK (imperial) gallons. A UK gallon equals 1.2 US gallons.
Water utilities often charge by units of 100 cubic feet (748.052 gallons), also known as a “CCF”.
Temperature can affect the volume of liquids, especially when high precision is required.
For most practical purposes, rounding to 7.48 gallons per cubic foot is accurate enough.

How many gallons is exactly 1 cubic foot?

Exactly 1 cubic foot equals 7.48052 US gallons.

Why is the conversion from cubic feet to gallons important?

This conversion is essential for various applications such as water storage, fuel tanks, aquariums, swimming pools, and many engineering and construction projects where volumes need to be calculated.

How do I convert gallons to cubic feet?

To convert from US gallons to cubic feet, divide the volume in gallons by 7.48052, or multiply by 0.133681.

Is a US gallon the same as a UK gallon?

No, they are different. A US gallon is equal to 3.78541 liters, while a UK (imperial) gallon is equal to 4.54609 liters. This means that 1 cubic foot equals 6.22884 UK gallons.

How can I visualize 1 cubic foot of water?

A cubic foot of water is approximately 7.5 gallons. Imagine a box that is 12 inches on each side, filled with water. That’s about 7.5 milk gallons.

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