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25,975 Posts

diameter X diameter X .7854 X length

If you do it in feet, the answer is cubic feet. One cubic foot = 7.48 gallons.

I would link you with a site, but seriously, you need to do the math.

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15,853 Posts

The area of a circle is PI (3.1416) X Radius-squared

Square the radius in inches. The radius is 1/2 of the tank's diameter or width. Multiply it by itself.

Now multiply that number by PI (3.1416) to determine the area in square inches.

Now, multiply this area of the circle by the length (in inches) of the tank

1 cubic foot = 1728 cubic inches so divide your total square inches by 1728 to determine your total square feet

1 cubic foot = 7.48051948 US gallons so multiply your total cubic feet by 7.48051948 to get the capacity of your tank in gallons.

If the tank has rounded ends, it gets much more complicated.

Personally, I fill the tank with liquid than pour it back into a gas can with measuring marks.

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750 Posts

why not just take the diameter and multiply by 3.14 and make the round flat. then divide that number by 4 and make it square. that will make it easier to figure out. or just call a nerd like i do and have them figure it out

Joined

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170 Posts

radius (Inches) x radius (inches) x pi (3.14285) x Depth/height (inches)

___________________________________________________________

231

or

r x r x Pi x d / 231= gallons

Joined

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170 Posts

why not just take the diameter and multiply by 3.14 and make the round flat. then divide that number by 4 and make it square. that will make it easier to figure out. or just call a nerd like i do and have them figure it out

8' dia x 8' h

48" x 48" x 3.14285 x 96" / 231 = 3009.2992 gals

96" x 3.14 / 4 75.36"......75.36 x 75.36 x 96 / 231 = 2360.1577 gals or

22% short, just sayin

Daniel

Mash on it

I'm trying to visualize a 12"X12"X12" (1 cubic ft) container holding 7 gallons??? When that container is made round, how can it hold 7 gallons??..... I see the math, but I also see what a 5 1/2 gallon jug looks like??? Looks much larger than a cubic ft, yet holds less....?? I could see 3/4 gallon, like .748, but, really 7 gallons???......I guess I'll have to build a sq foot and prove it to myself....

Ray

Joined

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170 Posts

12 x 12 x 12 = 1728 / 231 = 7.48 galsI'm trying to visualize a 12"X12"X12" (1 cubic ft) container holding 7 gallons??? When that container is made round, how can it hold 7 gallons??..... I see the math, but I also see what a 5 1/2 gallon jug looks like??? Looks much larger than a cubic ft, yet holds less....?? I could see 3/4 gallon, like .748, but, really 7 gallons???......

Ray

Jerry can appx 6 x 12.5 x 16 = 1200 / 231 = 5.19 gals

8" dia x 1" = 0.2176 gals per inch, so a 8 x 32 is appx 7 gals

12" dia. x 1" = 0.4897 gals per inch, so a 12 x 14.25" long tank = 7 gals ( fuel, plan on 90%, or 6.3 gals)

Daniel

mash on it

Oh I see it, I'm not disputing the math, just looking at this 5 1/2 gal jug and trying to figure where it is losing volume... The old "safety" cans with the spring loaded handle/cap, they were about 12-14" in diameter, and at least 14" tall, maybe 18" even, and they just held 5 gal.... I see the math, and math doesn't lie, no dispute there. It's just the practical application, the visual, that is misleading...Kinda like pouring measured amounts of water into a pan to figure how much will fit under the tray....12 x 12 x 12 = 1728 / 231 = 7.48 gals

Jerry can appx 6 x 12.5 x 16 = 1200 / 231 = 5.19 gals

8" dia x 1" = 0.2176 gals per inch, so a 8 x 32 is appx 7 gals

12" dia. x 1" = 0.4897 gals per inch, so a 12 x 14.25" long tank = 7 gals ( fuel, plan on 90%, or 6.3 gals)

Daniel

mash on it

Ray

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