Pool-Calculator6.0.1

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
CHEMICAL CALCULATORS
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)

RECOMMENDED CHEMICAL RANGES- USE OURS OR DECIDE YOUR OWN
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.

POOL VOLUME CALCULATOR
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

CHEMICAL EFFECTS CALCULATOR
“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!

Version History - Fixed a bug related to setting a pool's volume
- Fixed chemical dropdown height in the Effects tab 6.0.1 10/06/2025 - Redesigned app
- Now usable offline, with cloud syncing when connected
- Users can now share pools with others 6.0.0 09/01/2025 Fixed:
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! 5.0.1 03/29/2023 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. 5.0.0 01/03/2023 Updated for iOS 14. General bug fixes 4.2.0 02/05/2021 We've updated the app to use the native iOS selection capabilities rather than using a separate page for selections. This simplifies and improves the user experience.

We've also updated the logo and splash screen to reflect the fun we hope you have with your pool or hot tub this summer! 3.0.1 06/15/2019 Major updates! New features include simplification of user interface by removing login requirements, reports history, and ability to set multiple pools, ranges, and tests. Data is now stored locally to keep user inputs saved. 3.0.0 10/26/2018 Bug fixes for the 2.4.5 settings savings 2.5.1 09/02/2018 Bug fixes to ensure inputs are saved. 2.4.5 08/29/2018 Improved calculator save test workflow and addition of suggested chlorine levels. 2.4.4 06/15/2018 Major UI improvements, addition of logging capabilities, and major bug fixes to conversion capabilities 2.4.3 06/13/2018 Critical bug fixes to saving of pool information and calculator malfunctions as a result. Addition of ability to log chemical usage 2.3.2 06/06/2018 Minor fixes to navigation between tabs, bug fixes to "Save Test" functionality, and bug fixes to creating and saving pools in settings 2.3.1 05/30/2018 Major bug fixes to the calculator logic and settings functionality, UI improvements, and addition of icon navigation 2.2.1 05/29/2018 Major bug fixes including settings configuration and calculator logic. 2.1.1 05/28/2018 Major bug fixes that include account creation not working and select inputs not providing "Done" button. 2.1.0 05/27/2018 Brand new app for 2018! We've taken all the great things about Pool Calculator and reimagined what we can do to make pool care easy for pool owners and pool professionals. 2.0.0 05/24/2018 1.1.5 01/06/2011