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How to Calculate Swimming Pool Volume in Gallons

Here is how to figure  out the Gallons in a swimming pool:

Measure the swimming pool. You will need the overall length, width and the depth in both the shallow end and deep end.

The formulas below assume you are measuring in feet, and want results in gallons.

For a Rectangle Pool:
(Deep End + Shallow End) / 2 = Average Depth
Average Depth x Length x Width x 7.48 = Volume in Gallons


For a Round Pool:
Depth x Diameter squared x 5.9 = Volume in Gallons


For a  Free Form Pool:
(Deep End + Shallow End) / 2 = Average Depth
(Width A + Width B + Width C + ...) / (number of measurements) = Average Width
Average Depth x Length x Average Width x 7.48 = Volume in Gallons


An Example for a Rectangular Pool:

    Average depth (3’ to 8’ deep)
        3 + 8 = 11
        11 / 2 = 5.5
    Rectangle:
        Depth as in the example above
        40 feet long, 20 feet wide
        5.5 x 40 x 20 x 7.5 = 33,000 gal.

Reference:
http://www.wikihow.com/Calculate-Swimming-Pool-Volume-in-Gallons