What Is the Cubic Feet to Gallons Calculator?
This tool converts a volume measured in cubic feet (ft³) into US liquid gallons. One cubic foot holds exactly 7.48052 US gallons, so the conversion is a simple multiplication. It's handy for sizing water tanks, aquariums, pools, fuel containers, and any container where you know the volume in cubic feet but need gallons.
How to Use It
Enter the volume in cubic feet and read off the result in gallons. If you only have dimensions, first compute cubic feet by multiplying length × width × height (all in feet), then enter that value here.
The Formula Explained
The conversion uses \(\text{gal} = \text{ft}^3 \times 7.48052\). This factor comes from the fact that a US gallon is defined as 231 cubic inches, and one cubic foot equals 1,728 cubic inches. Dividing 1,728 by 231 gives approximately 7.48052 gallons per cubic foot.
Worked Example
Suppose you have a tank with a volume of 10 cubic feet. Multiply:
$$10 \times 7.48052 = 74.8052 \text{ gallons}$$So the tank holds about 74.81 US gallons.
FAQ
Is this US or Imperial gallons? This calculator uses US liquid gallons. One cubic foot equals about 6.2288 Imperial (UK) gallons instead.
How do I get cubic feet from inches? Divide cubic inches by 1,728, or divide a measurement in inches by 12 before multiplying the dimensions.
Does temperature matter? For everyday volume conversion, no — both units are pure volume measures and the factor 7.48052 is exact regardless of the liquid.
