# Water Flow Calculators > Calculates water flow using friction loss, nozzle, NFA, and Iowa formulas. (iPhone/iPad app by Waterous.) - Source: https://appshunter.io/ios/app/water-flow-calculators/id1096155801 (this page in markdown: same URL + `.md`) - Developer: [Waterous](https://appshunter.io/developer/1096155800) - Category: Education - Price: Free - Rating: 4.60/5 from 5 App Store ratings · 10 written reviews indexed - Age rating: 4+ - Requires: iOS 9.1 · 41 MB - Languages: American English - Released: 2016-03-29 - Data updated: 2026-06-01 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/water-flow-calculators/id1096155801/reviews.md ## What is Water Flow Calculators? Waterous Friction Loss / Smooth Nozzle / NFA and Iowa Formulas ## Key features - Friction loss calculations - Smooth nozzle calculations - NFA formula support - Iowa formula support - Fluid dynamics computations ## Recent user reviews (10 of 10) All indexed reviews: https://appshunter.io/ios/app/water-flow-calculators/id1096155801/reviews.md ### 5/5 — Great tool *2022-01-03* Every truck operator should use this as a backup plan for brain shutdown :) ### 2/5 — Needs improvement *2017-05-11, version 1.1.3* Good but pretty basic. Needs metric conversions for Canadian standards, and allow to calculate friction loss given diameter, lengths of hose and added fittings (wye, nozzle, etc) ### 3/5 — Where's the 2" hose? *2016-12-01* Slick app, missing 2" hose for fl calculations. ### 4/5 — Good idea but need some refinement *2016-11-25, version 1.1.2* Quick but basic flow calculations. Would like to see options for metric, KPA, Litres per min and metric hose sizes. Optional hose lengths etc. ### 4/5 — Great.. But needs a little more work. *2016-11-25* App is very easy to use, easy to read, and took no time to figure out. However there need to be additional tip sizes such as the 15/16" & 1 1/8" (both of which are very widely used in the fire service) as well as adding provisions for 2" hose with 2.5" couplings (rapidly gaining popularity & use in the fire service). Stuck between 3 & 4 stars, but went with 4. ### 3/5 — Good, fast, not great *2016-06-20, version 1.1.1* And pretty much useless in Canada. Yes, it does measure flow in liters but measures pressure in bar, not kPa. All tip sizes are in inches, not millimeters. For these reasons, I don't recommend this for Canadian firefighters until all measurements can quickly and easily be converted to SI measurements. ### 4/5 — Good app *2016-05-24* I really like how simple this app is along with the look and feel. All of this makes it very useful. If the developers could consider the following: Add a third option that assists firefighters in determining true coefficients or true friction loss based on their actual flows. For example most hose is not actually true 1.75. If I perform a flow test I find it takes 30 psi per 100' to get 161gpm or 50 at the 7/8 tip. If I could input that 30 psi into the app and have it tell me the coefficient is 11.5 not 15.5 that would be extremely useful for firefighters. ### 5/5 — Need another tip size! *2016-05-13* The 1-3/16" tip known as the "missing tip" that departments are purchasing all over America needs to be added! Great app though. ### 4/5 — Add stuff *2016-05-08* Add 15/16" 1 1/8" 2" hose w 2 1/2" couplings ### 1/5 — Someone forget something? *2016-05-05* 15/16" tip 2" hose line ## Frequently asked questions about Water Flow Calculators ### What formulas does Water Flow Calculators use? Water Flow Calculators utilizes the Waterous Friction Loss, Smooth Nozzle, NFA, and Iowa formulas for water flow calculations. ### Is Water Flow Calculators free to use? Yes, Water Flow Calculators is available for free, with no cost to download or use its calculation features. ### What devices support Water Flow Calculators? Water Flow Calculators is compatible with iPhone, iPad, and iPod devices. ### How often is Water Flow Calculators updated? The latest version of Water Flow Calculators was released on May 30, 2018. It has not received updates since then. ### What is the age rating for Water Flow Calculators? Water Flow Calculators has an age rating of 4+, making it suitable for a wide range of users. ### What is the user sentiment for Water Flow Calculators? Based on the limited data, users have a very positive sentiment, reflected in its 4.6-star rating from 5 reviews. ### Does Water Flow Calculators have ads? No, Water Flow Calculators does not contain advertisements. ## Version history (last 5 releases) ### 1.1.8 — 2018-05-30 This app has been updated by Apple to display the Apple Watch app icon. Adjust friction loss calculator's coefficient for 3" and 5" hoses Fix scaling for 2:1 aspect ratio devices ### 1.1.6 — 2018-04-25 iPhone X layout fix ### 1.1.5 — 2018-04-23 New fire flow requirement calculators, both NFA and IOWA. ### 1.1.4 — 2017-07-24 Added 2" hose diameter to the friction loss calculator ### 1.1.3 — 2016-11-28 Added 15/16, 1-1/8, 1-3/16, 1-7/8 to the Discharge Calculator's nozzle diameter selection ## Apps similar to Water Flow Calculators | App | Rating | Price | Category | | --- | --- | --- | --- | | [IFSTA eLibrary](https://appshunter.io/ios/app/ifsta-elibrary/id1625106484) | 3.2 (6) | Free | Education | | [IFSTA Essentials 7](https://appshunter.io/ios/app/ifsta-essentials-7/id1441449622) | 4.6 (1,807) | Free | Education | | [IFSTA Instructor 9](https://appshunter.io/ios/app/ifsta-instructor-9/id1604765850) | 3.2 (17) | Free | Education | | [IFSTA Company Officer 6](https://appshunter.io/ios/app/ifsta-company-officer-6/id1584832170) | 2.0 (27) | Free | Education | | [IFSTA Driver/Operator 3](https://appshunter.io/ios/app/ifsta-driveroperator-3/id6444622325) | 2.8 (24) | Free | Education | ## More apps by Waterous - [Waterous Connect](https://appshunter.io/ios/app/waterous-connect/id1451737271) All apps by Waterous: https://appshunter.io/developer/1096155800 ## Related topics [water flow calculators](https://appshunter.io/ios/topics/water-flow-calculators) · [friction loss calculator](https://appshunter.io/ios/topics/friction-loss-calculator) · [friction loss calc](https://appshunter.io/ios/topics/friction-loss-calc) · [waterous tech tool](https://appshunter.io/ios/topics/waterous-tech-tool) · [water tech tool](https://appshunter.io/ios/topics/water-tech-tool) · [tech tool](https://appshunter.io/ios/topics/tech-tool) · [elkhart brass](https://appshunter.io/ios/topics/elkhart-brass) · [pvc flow](https://appshunter.io/ios/topics/pvc-flow) · [flow en luberon](https://appshunter.io/ios/topics/flow-en-luberon) · [tech tools](https://appshunter.io/ios/topics/tech-tools) · [tube master flow](https://appshunter.io/ios/topics/tube-master-flow) · [brilionxflow](https://appshunter.io/ios/topics/brilionxflow) · [cowlitz water flow](https://appshunter.io/ios/topics/cowlitz-water-flow) · [cvcp max](https://appshunter.io/ios/topics/cvcp-max) · [cmwr 2022](https://appshunter.io/ios/topics/cmwr-2022) · [stakely flow](https://appshunter.io/ios/topics/stakely-flow) · [fluiddensityflow](https://appshunter.io/ios/topics/fluiddensityflow) · [worksight flow](https://appshunter.io/ios/topics/worksight-flow) · [air flow conversion calculator](https://appshunter.io/ios/topics/air-flow-conversion-calculator) · [brass flows](https://appshunter.io/ios/topics/brass-flows) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-01.*