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01262012, 10:14 AM  #1 
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Join Date: Jan 2012
Location: Orlando fl
Posts: 15

Volume of water in pool
Recently i moved into a house with a pool. The size of the pool is;
30ft long x 20 feet wide. the deepest part is 6ft and the shallow part is 3ft. Can someone please help me on how to calculate the volume of water. 
01262012, 10:23 AM  #2 
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Join Date: Nov 2010
Posts: 288

Volume of water in pool
30x20x6=3600 cubic ft
30x20x3=1800 cubic ft If your pool is half shallow end and half deep end your volume would be 2700 ft^3. 
The Following User Says Thank You to michaelcherr For This Useful Post:  florida56 (01262012) 
01262012, 10:25 AM  #3 
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Location: SW Suburbs of Chicago
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Volume of water in pool
I think to be more exact, we'd need to know how much of the pool is deep, how much is shallow, and if the shallow end slopes to the deep end, how long is that slope?
To add to the above post, 2700 cubic feet is about 20,200 gallons. 
01262012, 10:33 AM  #4 
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Join Date: Jan 2012
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Volume of water in pool
Thanks for your help. What i really wanted to know is how to do the math.

01262012, 10:41 AM  #5 
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Volume of water in pool
Oh. Well, like michaelcherr pointed out, you just calculate the volume (LxWxH). If you have only 2 squared off areas (no slope), then you would do like he did in his calculations.
If there is a slope between the two areas, you'll need to calculate it out in a couple of parts (The 3' area, the 6' area, and the area above the slope) then add these areas together. Any of these will show a result in cubic feet. 1 cubic foot is equal to about 7.48 gallons of water. So, you then multiply your total cubic feet by 7.48 to get the number of gallons. If you want to be very exact, 1 cuft = 7.48051948 gallons (Google). 
01262012, 10:50 AM  #6 
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Volume of water in pool
I'll go one step further, here is a diagram.
Assuming the 3' deep and 6' parts are both 10' wide, and the sloped part is also 10' wide, here is what you have. Calculate up the square foot areas of each of these sections: 6x10 = 60 10x3 = 30 10x3 = 30 10*3/2 = 15 (triangle = base x height / 2) Add them together: 60+30+30+15 = 135 square feet. Multiply 135 x 20 (the width of the pool) = 2700 cubic feet  the same as if there was no sloped area in this case (since the deep and shallow parts are equally sized). 2700 cubic feet x 7.48 gallons per foot = 20,196 gallons. 
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