Q&A for How to Calculate Gallons

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My pond is 12' wide, 15' long, 2' deep; how many gallons will it hold?

Donagan

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As there are 7.48 gallons in a cubic foot, multiply width by length by depth to find the volume in cubic feet, then multiply by 7.48.

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I have an air tank, 12" x 12" x 18", that says it is 10 gallons. Is that correct?

Donagan

Top Answerer

There are 231 cubic inches in a gallon. The tank contains 2,592 cubic inches. 2592 ÷ 231 = 11.22 gallons.

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18" H x 13" W x 60" L. How many gallons of water?

Donagan

Top Answerer

Multiply height by width by length. That gives the volume in cubic inches. Then divide by 231. That gives the volume in gallons.

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How many gallons are in an oil tank size is 44" height, 24" wide and 5' long?

Donagan

Top Answerer

Assuming a rectilinear tank, multiply 44" by 24" by 60" to get a volume of 63,360 cubic inches. As explained in Part 1 Step 1 above, divide cubic inches by 231 to get gallons. 63,360 ÷ 231 = 274.286 gallons.

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How many gallons in a peck?

Donagan

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1 imperial peck = 2 imperial gallons = 2.064 U.S. dry gallons. 1 U.S. peck = 2 U.S. dry gallons = 1.94 imperial gallons.

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I have a tank 38" diameter x 62" long, how many gallons will it hold?

Donagan

Top Answerer

Take half the diameter: that's the radius. Square the radius. Multiply by pi. That's the cross-sectional area of the tank. Multiply by the length. That's the volume in cubic inches. Use the conversion factor cited above: divide the volume by 231. That's how many gallons the tank holds.

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