What Is the Gallons to Cubic Feet Calculator?
This tool converts a volume measured in US liquid gallons into cubic feet (ft³). Both units measure volume, but gallons are common for liquids while cubic feet are widely used in construction, HVAC sizing, water-tank capacity, and natural gas billing. One cubic foot holds approximately 7.48052 US gallons, so the conversion is a simple division.
How to Use It
Enter the number of US gallons you want to convert and the calculator instantly returns the equivalent volume in cubic feet. It accepts whole numbers and decimals, making it useful for everything from aquarium volumes to industrial tank capacities.
The Formula Explained
The relationship is defined by the exact factor that one cubic foot equals 7.48052 US gallons:
$$\text{cubic feet} = \frac{\text{gallons}}{7.48052}$$
Because you are dividing by a number larger than one, the cubic-foot value is always smaller than the gallon value.
Worked Example
Suppose you have a 100-gallon water tank. Divide 100 by 7.48052: $$100 \div 7.48052 = 13.3681 \text{ cubic feet}$$ So a 100-gallon tank holds about \(13.37\) ft³ of water.
FAQ
Does this use US or Imperial gallons? It uses US liquid gallons. One US gallon \(\approx 0.13368\) ft³, while one Imperial (UK) gallon \(\approx 0.16054\) ft³.
How do I convert cubic feet back to gallons? Multiply the cubic feet by 7.48052. For example, \(5 \text{ ft}^3 \times 7.48052 = 37.4\) gallons.
Is the result exact? The factor 7.48052 is accurate to five decimal places and is sufficient for nearly all practical purposes.
