1 cubic inch = 0.004329 (US) gallons, approx.
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It is 7.83 gallons per inch. .785x4x4x1=12.56 cubic feet. 12.56 cubic feet x 7.48 gallons per cubic foot=93.9 gallons per foot 93.9 gallons per foot / 12 inches per foot =7.83 gallons per inch.
Let's calculate cubic feet first, then convert to gallons. Volume=pir2h=3.14159x0.252x3=0.59 cubic feet 0.59 cubic feetx7.48 gallons/cubic foot=4.4 gallons
To calculate barrels per inch, you need to know the volume of the barrel in gallons and the dimensions of the barrel in inches. First, convert the barrel volume to cubic inches (1 barrel = 31.5 gallons = 3,785.41 cubic inches). Then, divide the total volume of the barrel by the height of the barrel in inches. The formula is: Barrels per inch = (Volume of the barrel in cubic inches) / (Height of the barrel in inches).
231 cubic inches. So 0.832674 Gallons.
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.