200 reviews
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About this app

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

Pool Calculator 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 Android phone or tablet out to the pool and have all the chemical information and calculations you need right at your fingertips.

Pool Calculator provides a complete tool kit to make pool care easy. You get:
• Chemical Calculators
• Volume Calculator
• 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 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 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 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 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
Updated on
Aug 31, 2023

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Personal info and App activity
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

195 reviews
April 15, 2022
I purchased the app to support the developers a year or so ago. It's cumbersome. Have to hit the check box on the keyboard to save entries, which is non intuitive. Doesn't appear to be a way to save tests, so I went back to check the online version and now I guess there's a membership cost to actually save them. The data behind this app for on demand testing and balancing a pool/spa is very helpful, but the app design is certainly lacking and makes what should be very easy clumsy.
8 people found this review helpful
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A Google user
May 1, 2019
needs to have a working back button, or a prompt if your are sure you want to go back. no tracking only can update the most current figured. i do like the built in CYA shock chart that automatically changes, also like the "what if" analysis on the last tab.
7 people found this review helpful
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Pool and Spa Resources
May 26, 2019
WIll, We are rebuilding the Android app and plan to release it in mid-June. The new app will allow you to track your history. We would love for you to Beta test the new Android app before its release so you can provide feedback to ensure it meets your needs going forward. If interested, contact us at support@poolandsparesources.com. Thanks!
A Google user
November 17, 2019
Bad app for DIYs just learning. I have a spa. The app suggests that my total alkalinity should be between 50 and 80, this is erroneous. In the Effects part of the app it says that washing soda/sodium carbonate decreases pH and alkalinity which is totally erroneous. I have emailed the makers of this app with no response. Kind of a waste for a couple dollars!
6 people found this review helpful
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Pool and Spa Resources
November 25, 2019
J, The reason for having lower total alkalinity in spas than the recommended pool range of 80-120 is that the less alkaline the water is, the more effective free chlorine will be. Spas have much higher concentrations of contaminants than pools, which is why we recommend the trade-off between more stable pH and sanitizing power of free chlorine.

What's new

Users with accounts can now log in from the app and use the pool data they have set up online.
Calculated volumes can be saved to an existing pool setup.
The app now shows which volume is being used for tests.