How many gallons of water are in your pool, and why does it matter?

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How many gallons of water are in your pool, and why does it matter?

How to measure pool volume

“How many gallons of water are in your pool?”  If you are one of those brave souls who wishes to take care of your pool on your own, this is a question you will need to answer. You will hear this question if you take a water sample to your local pool store for testing.  In order to come to a conclusion, there are several factors that come into play.

Unless you are a school teacher who specializes in mathematics or chemistry, you will probably not remember how to calculate the volume of a liquid, much less the volume of water in your pool.  If you’re like me, I don’t even want to know how.  That’s why I use a handy little “App” on my phone to do the math.  All I have to do is plug in the numbers and hit “calculate volume”, and I have the answer.  You do not need to install an App on your phone for this, however, because you are only going to calculate it once for your own pool.

To begin, measure the length and width of your pool.  This gives you the water’s surface area.  This can be helpful if you ever decide to purchase a pool cover.  Next, you need to know the average depth of your pool.  Many pools have a deep end and a shallow end. Also for many pools, the shallow end is about 3 feet in depth.  And they have a deep end that is 6 to 8 feet deep, unless there is a diving board involved.

For this example, let’s use 3 feet for the shallow end and 6 feet for the deep end.  Add 3 plus 6, and you get 9.  Divide 9 by 2, and you get 4.5.  This is your average depth.  Next, take your surface area and multiply by 4.5.  Then take that number and multiply by 7.5, which is approximately the number of gallons per cubic foot.

To make it easy, let’s say your pool is 12 feet wide by 20 feet long.  Here is the calculation you will make:

(12 x 20) x 4.5 x 7.5

So,  the final numbers are: 240 x 4.5 x 7.5 = 8,100 gallons

Now you are prepared when you hear the question, “How many gallons of water are in your pool?”

Happy Swimming!

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