How Do I Convert Cubic Inches To Gallons?


3 Answers

Oddman Profile
Oddman answered
There are exactly 231 cubic inches in a US liquid gallon. To convert from cubic inches to gallons, multiply by (1 gallon/(231 in3)). The conversion factor is different for other definitions of gallon.

1 ft3 = (12 in)3 = 1728 in3
  = (1728 in3)*(1 gal/(231 in3)) = (1728/231) gal
  = 7.480519 gal    (the underlined digits repeat indefinitely)
  = 7 37/77 gal
thanked the writer.
Anonymous commented
But hoe did you get the 231 for a gallon? What formula?
Anonymous commented
How do you get 231 for a gallon?
Oddman commented
That a gallon is 231 in^3 is a matter of US law.
Anonymous Profile
Anonymous answered
For liquid measurements there are 231 cubic inches in a gallon.
For dry measurements there are 268.8 cubic inches in a gallon.

Your formula would then be to divide your number of cubic inches by 231 for liquid gallons and 268.8 for dry gallons.
Anonymous Profile
Anonymous answered
1357.16 cubic inches to gallons

Answer Question