Introducing the new Pool Calculator for 2018! Pool Calculator has been completely re-designed to be easier and faster to use for pool and spa owners and pool professionals.

Looking for help with calculations while you're adjusting your swimming pool or spa chemistry? The Pool Calculator does all the math for you, telling you exactly how much of each chemical to add to keep your water in balance.

No more puzzling over complicated charts and formulas. Get the exact answer in one step. Bring your iPhone out to the pool and have all the chemical information and calculations you need right at your fingertips! Also includes useful basic pool chemistry information!

Available calculations include:
- Chlorine (FC)
- Raising and lowering pH
- Total alkalinity (TA)
- Calcium hardness (CH)
- Stabilizer (CYA or cyanuric acid)
- Salt
- Borate (Borax)
- Calcium saturation index (CSI, similar to LSI)
- Recommended ranges for each chemical level
- Volume
US, metric, and Imperial units available.

Simply enter your swimming pool volume, current test results and preferred chemicals, and the Pool Calculator will calculate exactly how much of each chemical you need to add to get your water into perfect balance.

What's New

Version 2.5.1

Bug fixes for the 2.4.5 settings savings

Ratings and Reviews

3.8 out of 5
22 Ratings
22 Ratings

Good app but could be better

I like the app and use it everyday. It really helps keep track of my chems. The only thing I can think of to make it better would be a box to add notes for the test. E.g. I like to check my total chlorine and my phosphates. There are no fields for those. I'm sure if you put every test possible the app would not be reasonable to use but if there was a field to add a quick note, that would make it easier to keep track of other values. But it's a great app!👍



I paid $5 for this app. For that it asks me every time I open the app if I like the app and then asks me to rate it even though I gave it a 4 star rating. It even asks in the middle of using the app to rate it. If you can’t even check if we have already rated the app stop asking the question. That is why I gave the app a 1 star rating.


Don't waste your money

It used to be a very user friendly and reliable app to calculate my pool Chems when it was version 1.5.

Now that they have updated it to version 2.x it just lags, hangs up and gui is not user friendly.

So don't waste your time and money.


Pool and Spa Resources, LLC
24 MB
Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© Copyright 2018, Pool and Spa Resources, LLC


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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