There are exactly 231 cubic inches in a US liquid gallon. To convert from cubic inches to gallons, multiply by (1 gallon/(231 in

Example

1 ft

= (1728 in

= 7.480519 gal (the underlined digits repeat indefinitely)

= 7 37/77 gal

^{3})). The conversion factor is different for other definitions of gallon.Example

1 ft

^{3}= (12 in)^{3}= 1728 in^{3}= (1728 in

^{3})*(1 gal/(231 in^{3})) = (1728/231) gal= 7.480519 gal (the underlined digits repeat indefinitely)

= 7 37/77 gal