Pool-Calculator 4+

Pool chemistry made easy‪!‬

Pool and Spa Resources, LLC

    • $4.99



Looking for help with calculations for your swimming pool or hot tub chemistry maintenance? The Pool Calculator does all the math for you, making chemical testing and treating your pool or hot tub a breeze.

Pool Calculator is easy to use, and tells you exactly how much of each chemical to add to keep your water in balance and crystal clear. No more puzzling over complicated charts and formulas.

Bring your iPhone or iPad out to the pool and have all the chemical information and calculations you need right at your fingertips.

Pool Calculator works offline and online, so if you have poor internet reception by your pool, you’re still able to get test results.

Pool Calculator provides a complete tool kit to make pool care easy. You get:
• Chemical Calculator
• Pool Volume Calculator
• Chemical Effects (What-if) Calculator

You can use whichever test strip or test kit you prefer for testing your pool or hot tub. Pool Calculator provides calculations for:
- Chlorine (FCl)
- Raising pH
- Lowering pH
- Total alkalinity (TA)
- Calcium hardness (CH)
- Stabilizer (CYA or cyanuric acid)
- Salt
- Borate (Borax)
- Calcium saturation index (CSI, similar to LSI)

With Pool Calculator, the recommended ranges for your chemicals are based upon whether you have a pool or hot tub, and the surface material (plaster, vinyl or fiberglass) of your pool or hot tub. You can choose from several pre-defined ranges or customize based on your or your pool pro’s preferences.

To keep your swimming pool or hot tub at its best, it’s important that you accurately calculate your water volume. All of the chemical balancing recommendations you receive from the Pool Calculator are based on it. You can calculate the volume of your pool in metric units (liters) or in imperial units (gallons). The Pool Volume Calculator can be used for:
• Rectangular Pools and Hot Tubs
• Oval Pools and Hot Tubs
• Round Pools and Hot Tubs

“What if” analysis for adding chemicals to your pool or hot tub! Ever want to know the impact of adding a given amount of Chemical has on your swimming pool or hot tub chemistry?

The Chemical Effects Calculator calculates the impact adding a specific amount of chemical has on your pool chemistry. It does this not only for the primary purpose of the chemical, but also on the other important measurements for your pool. For example, adding Trichlor not only raises your Free Chlorine, it also increases your Cyanuric Acid, lowers your pH and increases your Salt. Adding Cal Hypo raises Free Chlorine, and also raises Calcium Hardness (CH) and Salt.

With the Chemical Effects Calculator, you can measure the effects on pool chemistry of adding a given dose of:
• Bleach
• Trichlor
• Dichlor
• Cal-hypo
• Lithium Hypochlorite
• Chlorine gas
• Muriatic Acid
• Dry Acid
• Washing soda
• Soda Ash
• Borax
• Sodium Tetraborate Pentahydrate
• Boric Acid
• Caustic Acid (lye)
• Baking Soda
• Calcium Chloride
• Calcium Chloride dihydrate
• Stabilizer
• Liquid Stabilizer
• Salt

PoolCalculator can be used for in ground or above ground pools, spas and hot tubs, chlorine or salt pools, and a broad range of surfaces.
Running into problems? Let us know at support@poolcalculator.com!

What’s New

Version 5.0.1

1. App crashes at start on iOS 12
2. Keyboard gets stuck in Volume Calculator on some devices
3. Borate not showing app in tests (make sure goals are set for Borate)
4. Range not showing correctly on some devices
Running into problems? Let us know at support@poolcalculator.com!

Ratings and Reviews

4.1 out of 5
536 Ratings

536 Ratings

FF Ranch ,

Finally crystal clear water!!

Love this app! This app coupled with the HTH 6-way test kit (liquid set - not the paper strips which expire) tells me exactly how much of what chemical to add to get my pool balanced. I struggled for months with info from the Internet until I found the pool calculator website and downloaded the app. Just plug in the results from the test kit and follow the advice from the app. Works perfectly for us. This is the best $5 I have spent all year! Thank you for helping me make our pool beautiful to swim in!

Grrrrrrrrreg ,

Need to fix Soda Ash effect info. (Otherwise good app)

Soda Ash Effect says it “lowers pH and TA” but it actually raises. I’ve been using the online app for a while and decided to buy the app for ease of use. I’m happy with it, and like the “effects” function for more details, but the soda ash effect is wrong. It makes me question the accuracy of the rest of the chemicals and calculators. I cannot find a feedback or contact function on the app or online, so I figured leaving a review might make it back to the developer. All of the effects should be double checked. Other than those two issues, I’m very happy with the ease of use and clarity of info.

NvHunter ,

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!👍

App Privacy

The developer, Pool and Spa Resources, LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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