# Thread: Size of my pool calculation

1. ## Size of my pool calculation

Various calculators estimate my pool size to be between 18,000 to 22,000 gallons. However, when I pour in 1 jug of GV 6% bleach (182 oz) I get 5.5 ppm increase in ch. That puts my pool size at around 16,000 gal.

What do you think?

2. ## Re: Size of my pool calculation

Sounds like you have a 16,000 gallon pool.

My calculation for mine came to 47,000 gallons, but like you I found it wasn't accurate. I use 44,000 gallons because when I add chemicals, it works out correctly.

3. ## Re: Size of my pool calculation

Most calculations do not consider steps and/or other feature that might reduce the gallons. You may be correct around 16000 - 18000 gallons

4. ## Re: Size of my pool calculation

You can't count on bleach being exactly 6%. If it came from the factory recently it might be higher, and if it has been sitting around for a while it might be lower, anywhere from 3% to 8% in extreme cases. To adjust your pool size estimate you need to watch several different chemical additions over a period of time. If they are all consistently coming out higher than expected then the pool is smaller than you think.

Estimating the pool size is tricky. Fortunately you only need to be within 10 or 20 percent, as that is good enough. For now I would go with 18,000 gallons, and then adjust that over time if you are seeing a consistent pattern.

5. ## Re: Size of my pool calculation

It is easy to calculate the size of a square (rectangle). Just get in the water and measure various 'blocks' and then add those 'blocks' together. We are all about taking charge of our pool. Why are you relying on someone else to 'estimate' the size of YOUR pool. Get wet!

6. ## Re: Size of my pool calculation

chemical sizing is fairly accurate if verified over several additions of several different chems.

Pool Calculators are not very accurate because they don't have enough parameters entered (slopes, curves, radius', steps, etc.) and because most people tend to put the depth of the pool in and not the actual water depth.

Pool Stores like to exaggerate the size of your pool because their software figures doses (and therefore chem sales) based on the entered size. I have one PS that says my pool holds almost 16,000 gallons and it doesn't even hold quite 13,000 gallons.

7. ## Re: Size of my pool calculation

Originally Posted by Voodoo_Pool
It is easy to calculate the size of a square (rectangle). Just get in the water and measure various 'blocks' and then add those 'blocks' together. We are all about taking charge of our pool. Why are you relying on someone else to 'estimate' the size of YOUR pool. Get wet!

I wish my pool was rectangular, then I can easily put a cover. Also, calculating 'blocks' would be easier.

8. ## Re: Size of my pool calculation

YES! Make your pool a bunch of 'blocks' and add them together. This is 'simple' high school calculus.

9. ## Re: Size of my pool calculation

Originally Posted by Voodoo_Pool
This is 'simple' high school calculus.
Not everyone knows how to do intregal calculus

Coming within a couple thousand gallons on an estimate will get one close.

10. ## Re: Size of my pool calculation

Originally Posted by bk406
Originally Posted by Voodoo_Pool
This is 'simple' high school calculus.
Not everyone knows how to do intregal calculus

Coming within a couple thousand gallons on an estimate will get one close.
Oh, so it is like nuclear weapons. Close enough. Or government work.

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