Knowing the amount of water in your pool is very important.  Not only do you need to know how many gallons your pool holds but, more importantly, you need to know how much water is in your pool so that you can properly calculate and apply pool chemicals.

As you probably all are aware, making a small error in your pool chemical measurements can equal a BIG problem with your pool water (not to mention a BIG headache for you to fix it).  Calculating pool volume is not difficult once you know how to do it.

So here is a simple quick guide on how to make it happen…

In order to figure out proper doses of chemicals for your pool, you need to determine how many gallons of water it holds. To do that, you need to know four different numbers: (1) the length, (2) the width, (3) the average depth, and (4) a multiplier that determines gallons.

In general, here is the formula to calculate the number of gallons your pool holds:

LENGTH x WIDTH x AVERAGE DEPTH x MULTIPLIER = GALLONS

There are also more specific formulas for calculating volume depending on what shape pool you have.  Here are those formulas:

Rectangular Or Square Swimming Pools:

Length (in feet) X Width (in feet) X Average Water Depth (in feet) X 7.5 = Pool Volume in Gallons (U.S.)

- or -

Length (Meters) X Width (Meters) X Average Water Depth (Meters) X 1000 = Pool Volume in Liters

Circular Swimming Pools:

Diameter (in feet) X Diameter (in feet) X Average Water Depth (in feet) X 5.9 = Pool Volume in Gallons (U.S.)

-  or -

Diameter (Meters) X Diameter (Meters) X Average Water Depth (Meters) X 785 = Pool Volume in Liters

Oval Swimming Pools:

Long Diameter (in feet) X Short Diameter (in feet) X Average Water Depth (in feet) X 5.9 = Pool Volume in Gallons (U.S.)

- or -

Long Diameter (Meters) X Short Diameter (Meters) X Average Water Depth (Meters) X 785 = Pool Volume in Meters

Here is how you determine the multiplier:

Rectangle, square, or free-form pool: multiplier = 7.5.

Round or Oval pool: multiplier = 5.9

Here is how you determine the average depth in a pool where the bottom slopes:

Measure the shallow end depth.

Measure the deep end depth.

Add those two measurements together.

Divide the sum by two (2).

For example, if your shallow end is 2′ deep and your deep end is 10′ deep, then your calculation would look like this:

2′ + 10′ = 12′; 12′/2 = 6′ Average Depth

There is also a little download at http://www.filebuzz.com/fileinfo/21142/Kool_Swimming_Pool_Tool.html

(may need to copy/paste this into a browser)

This will do the calculations for you!  Just plug in the parameters and let it go to work for you.  Simple and FREE.

Filed under: General Information, Misc Items