Math challenged-gallons in 12' round pool?

Belfrybat · #1 06/29/10, 11:13 AM

I'm thinking about purchasing an above ground pool for water storage. I've found a good price on a 12' x 39" pool. How do I compute the gallons it will hold? Or if someone would compute it for me?

tinknal · #2 06/29/10, 11:22 AM

Will you bake me a Pi if I tell you?

Wisconsin Ann · #3 06/29/10, 11:53 AM

cylinder volume: (Pi x cylinder radius ' squared x cylinder height ') will give you cubic inches. then multiply by 7.48051945 for gallons.

so....3.14159 x 36 x 3.25 = 367.56603 cubic feet. x 7.48051945 = 2749.58 gallons.

NOW, that being said, your pool may or may not be a straight sided cylinder. but..this is a good place to start.

or you can go HERE and input the info for various cubes, cylinders, pyramids, cones, etc. and then multiply by numbers for gallons

watcher · #4 06/29/10, 12:10 PM

One quick thing. IIRC the 39" measurement is to the top of the side wall so if you need a fairly accurate measurement you'll need to take 2 or 3 inches off the height.

Using Ann's equation and 3 feet of water we get. . .2538.08 gallons. So if you are adding chemicals you need enough for 2500 gallons not 2700.

beewench · #5 06/29/10, 12:14 PM

Pi r not square! Cornbread r square!

-=Sarah
www.beewench.blogspot.com

Sawmill Jim · #6 06/29/10, 01:50 PM

I just type in size of pool along with gals and a pool chart will pop up .

radiofish · #7 06/29/10, 08:15 PM

Quote:

Originally Posted by Wisconsin Ann

cylinder volume: (Pi x cylinder radius ' squared x cylinder height ') will give you cubic inches. then multiply by 7.48051945 for gallons.

so....3.14159 x 36 x 3.25 = 367.56603 cubic feet. x 7.48051945 = 2749.58 gallons.

NOW, that being said, your pool may or may not be a straight sided cylinder. but..this is a good place to start.

or you can go HERE and input the info for various cubes, cylinders, pyramids, cones, etc. and then multiply by numbers for gallons

Ann - I didn't see a link that you referred too in your post..

You beat me to posting the answer (Pi X 'R squared' X height).
I could not show off my college/ university fisheries education, on how I had to measure the volume of different fish rearing ponds/ raceways at several different fish hatcheries.

Plus for weight, a gallon of water is 8.3 pounds..

Math Can Be Fun....

Belfrybat · #8 06/29/10, 09:16 PM

Thank you, thank you, thank you!!!

And yes, I will bake all of you a pi.

That is more capacity than I thought. I can buy a swimming pool for around $150.00, whereas a regular water storage tank holding 2500 gallons is $1100.00. Big difference. Anyone know how many years I could expect the pool to last if I keep it covered? BTW, it's a steel framed pool, not those blow up kind.

KIT.S · #9 06/30/10, 10:46 AM

I purchased a big 21 ft diameter 5 ft deep steel sided pool second hand - about 10,000 gallons. It was many years old - more than 10, I believe. We replaced the liner (around $250 including postage) and the "new" liner was 5 years old when we moved and still in excellent shape. We've really thought about getting another for raising tilapia, but we have so much going already...
Kit

jross · #10 06/30/10, 02:36 PM

I can tell you that a 16'x24', 4 ft deep pool will hold 11500 gallons. I can also tell you that the "Lifetime" Kayak pool we got in 1986 lasted much longer than the Kayak co, did.