Use this formula: cubic inches x 0.004329 = gallons
1 gallons US = 231 cubic inches
10 gallons US x 231 = 2310 cubic inches
To convert cubic inches to gallons, divide cubic inches by 231:Cubic inches / 231 = US gallons
Conversion: cubic inches x 0.003605 = Imperial gallons
One cubic inch is equal to 0.004329004 gallons. (cubic inches) * 0.004329004 = gallons
0.004329
First calculate the cubic inches, then convert to gallons. Volume=pir2h=3.1416x32X120=3393 cubic inches 3393 cubic inchesx0.00433 gallons/cubic inch=14.7 gallons
3.69 gallons is 852.39 cubic inches.
231 cubic inches == (presumed that you meant cubic inches, which like gallons is a measure of volume, rather than square inches, which is a measure of area) 1 US gallon = 231 Cubic inches (presuming you meant cubic inches, which like gallons is a measure of volume, rather than square inches, which is a measure of area)
=There are 1,605.12 gallons in 481,536 cubic inches.==There are 1,605.12 gallons in 481,536 cubic inches.=
Assuming it is round, (1) convert all measurements to feet. (2) Use the formula for the volume of a cylinder to get the volume in cubic feet. (3) Convert from cubic feet to gallons. As an alternative, you can also convert all measurements to inches, and in the final step, convert from cubic inches to gallons.
(cu in) / 231 = gallons 1 cubic inch = 0.004 329 004 329 gallon [US, liquid]
For me I would convert to cubic feet and then to gallons. 30" : 2.5 ft 18" : 1.5 ft 6". : 0.5 ft Multiply all to get 1.875 cubic feet volume water is 7.48 gallons per cubic foot volume so 7.48 x 1.875 is 14.025 gallons
There are 25.71 gallons of water in 5,940 cubic inches.