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# gallonage equation

Last Updated: Feb 24, 2015

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For those who build their own fuel cells/airtanks here are some calculations to figure up your gallonage.

To calculate a square or box area you multiply the heightxwidthxlength to get your total cubic inches. There are 231 cubic inches in 1 gallon, so knowing this you divide your total cubic inches by 231 to get your total gallonage.

EXAMPLE. A fuel cell measuring 10'' wide by 10'' long by 10'' tall contains 1000 cubic inches. Divide that by 231 to get 4.32 gallons.

HxWxL/231= Gallons

To calculate a cylindrical shape such as a typical airtank you multiply PIxradius(squared)xheight.

Cylindrical Example

Tank

Length =30"

Width (diameter) =10"

So the formula is 3.14 x 5^2 x 30 = 2355 sq. Inches which =10.19 Gallons

Created By: **lofosho86**

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