# Pool-Calculator — Pool chemistry made easy! > Pool and hot tub chemistry calculator for easy water maintenance. (iPhone/iPad app by Pool and Spa Resources, LLC.) - Source: https://appshunter.io/ios/app/pool-calculator/id412876581 (this page in markdown: same URL + `.md`) - Developer: [Pool and Spa Resources, LLC](https://appshunter.io/developer/1358030201) - Category: Lifestyle, Utilities - Price: $4.99 - Rating: 4.20/5 from 629 App Store ratings · 101 written reviews indexed - Age rating: 4+ - Requires: iOS 15.1 · 17 MB - Languages: American English - Released: 2011-01-07 - Data updated: 2026-08-29 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/pool-calculator/id412876581/reviews.md ## What is Pool? 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! ## Key features - Chemical dosage calculations - Pool volume calculation - Chemical effects analysis - Customizable chemical ranges - Offline functionality ## What do users think of Pool? Overall sentiment: neutral **Pros** - 💡 Useful pool chemistry calculator - 🚀 Makes pool maintenance easy - 👍 Provides chemical dosage recommendations - 🔍 Helpful 'Effects' tool to understand chemical impacts **Cons** - 🐛 Accuracy issues with certain chemical calculations - 🔍 Confusing or outdated chemical names - 🔍 Limited customization options - 🐛 Crashes and compatibility issues with newer iOS versions **Commonly reported bugs** - App crashes on launch for many users - Keyboard issues preventing data entry - Incorrect chemical effect information (e.g. soda ash) - Volume calculation not updating properly **Most requested features** - Ability to save and track test history - Support for multiple pools/spas - Metric-only unit support - More detailed chemical dosage information (e.g. weight-based) ## Recent user reviews (10 of 101) All indexed reviews: https://appshunter.io/ios/app/pool-calculator/id412876581/reviews.md ### 1/5 — Scam *2025-08-03, version 5.0.1* Do not I mean do not give your credit card information especially from your apple wallet!!!!!! This has no contact information ### 5/5 — Super useful *2025-06-18, version 5.0.1* A pool mai te ande essential for me. ### 5/5 — Great app *2025-04-25, version 5.0.1* Has been a great teaching tool for me ### 3/5 — Don’t have the chemicals I use. *2024-09-05* Bummer. I really loved this app at first, but now I’m confused and cannot find a way to contact the company to ask for help. Doesn’t feel good to pay for an app and then not be able to get support. When using the calculator, it has certain options in a drop down menu to choose from so you know what amounts to add. But my chemicals aren’t in the list and there’s no help I can see to convert. One example: my ph up is liquid potassium carbonate. But what is on the list for raising ph is washing soda, soda ash, and borax. I google and can’t find any link between what I have and what they’re listing. So I’m stuck. Not cool. ### 4/5 — App suggestion *2024-07-14* App is great but I have a suggestion. Can you put a page in that allows us to change our tested amounts all at once without having to back in and out of each item? When I’m testing I do all my tests and then go back to read results so it’s a pain to have to constantly switch pages Otherwise the app is great! ### 1/5 — Sad Trombone *2024-05-04* As I recall this app used to be da bomb. But now it doesn’t work well on iPad or iPhone. Same failure scenario, can’t do a test without it crashing, or can set a parameter and then not be able to change it. Using the back button brings you to a blank page and have to force quit if you have any suggestions I’d be happy to try it, but I’ve had to resort to one of those other offerings that are simply not as user friendly (well, crashing is not user friendly but I remember when it used to work. I think it was a web app at the time ) ### 5/5 — Works Well and now saves settings *2023-11-17* The app did the job for me. Pool type volume etc are saved and loaded each time I restart the app. Would be good to be able to enable/display and disable/hide the chemical settings that are not of interest. Also name them at full name rather than the abbreviation I.e Total Alkalinity rather than TA. It works well and now saves the settings from one session to the next even across devices if you create an account. Thanks for a very useful app. ### 2/5 — DO NOT BUY! *2023-11-01* Waste of money. Company is in Nigeria. Wonder how much experience they have with pools - and with pools in our latitude. Paid $5 for this app. - It does not allow addition of a second pool or spa even though the one added is called “first pool.” If you have two units, the size must be reentered for each one if a different one is tested next. - And there is no tracking of history. Each test is entered separately with treatment suggestions given for that one instance. No way to know what I did last week or last month. -Have two stars because it does calculate pool size and gives suggestions based on the chemicals you buy (assuming “washing soda” is the same as sodium bicarbonate or baking soda). ### 5/5 — Lifesaver *2023-09-27* Moved to the country and built a pool. No one wants to come out and service it because the round trip is too long. This has been an incredible tool. First time pool owner. I have a sparkling blue pool all summer long!! Highly recommend!!! ### 1/5 — Fair but lots of room for improvement *2023-07-26, version 5.0.1* I am not sure how this app beats a piece of paper. I use an Excel spreadsheet to track my testing results and chemicals to be added to the pool. My objective is to develop charts to show the apparent interaction over time between chemical changes Ph, Cl, ALK etc. This app doesn’t appear to keep any records to compare one week vs the next. So I ask, why not us s piece of paper. This is junk. ## Frequently asked questions about Pool ### What does the Pool Calculator app do? The Pool Calculator app simplifies swimming pool and hot tub chemistry maintenance. It performs all the necessary calculations for chemical testing and treatment, telling you exactly how much of each chemical to add to keep your water balanced and clear. It eliminates the need to decipher complicated charts and formulas. ### What are the key features of the Pool Calculator app? Key features include a Chemical Calculator for various pool chemicals like chlorine, pH, and alkalinity, a Pool Volume Calculator for accurate water volume measurement, and a Chemical Effects Calculator for 'what-if' analysis on chemical additions. It also offers customizable chemical ranges and works both online and offline. ### Is the Pool Calculator app free to use? Yes, the Pool Calculator app is available for free. There are no in-app purchases or advertisements mentioned, indicating a completely free experience for users. ### What devices is the Pool Calculator app compatible with? The app is designed to be used on iPhones and iPads, allowing users to access all the chemical information and calculations they need right at their fingertips by the pool. ### How does the Pool Volume Calculator work? The Pool Volume Calculator is crucial for accurate chemical balancing. It allows you to calculate the volume of your pool or hot tub in both metric (liters) and imperial (gallons) units. It supports calculations for rectangular, oval, and round pools and hot tubs. ## Version history (last 5 releases) ### 6.0.1 — 2025-10-06 - Fixed a bug related to setting a pool's volume - Fixed chemical dropdown height in the Effects tab ### 6.0.0 — 2025-09-01 - Redesigned app - Now usable offline, with cloud syncing when connected - Users can now share pools with others ### 5.0.1 — 2023-03-29 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! ### 5.0.0 — 2023-01-03 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. ### 4.2.0 — 2021-02-05 Updated for iOS 14. 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User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-29.*