1800 (cubic feet) = 13 464.9351 US gallons
For future reference, Google can convert this measurement by typing the following string:
1800 cubic feet in US Gallons
The tricky part is to remember that there are more than one type of Gallon, so you need to specify that it's a US gallon that you are looking for.
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1 gallon = 231 cubic inches
1,720 cubic inches = 1 cubic foot
1,800 gallons = 240.625 cubic feet