# DO Calcs Buddy > Firefighter hoseline calculation and training tool with customizable settings. (iPhone/iPad app by Max McCoy.) - Source: https://appshunter.io/ios/app/do-calcs-buddy/id6749918102 (this page in markdown: same URL + `.md`) - Developer: [Max McCoy](https://appshunter.io/developer/1832824815) - Category: Education, Utilities - Price: Free - Rating: 4.80/5 from 4 App Store ratings · 1 written reviews indexed - Age rating: 4+ - Requires: iOS 15.0 · 69 MB - Released: 2025-08-19 - Data updated: 2026-08-25 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/do-calcs-buddy/id6749918102/reviews.md ## What is DO Calcs Buddy? DO Calcs Buddy is a customizable Driver/Operator pumping toolkit. Practice hoseline calculations, build hydraulic layouts, review essential concepts, and test your knowledge—all through a clean, visual interface designed for classroom study and non-emergency training. FEATURES: Visual Hydraulic Calculator / Simulator Build custom training layouts using engines, attack engines, hose segments, fog and smoothbore nozzles, wyes, manifolds, siamese connections, standpipes, foam eductors, monitors, hydrants, and master streams. Calculate required pump pressures while accounting for friction loss, appliance loss, elevation, flow, and nozzle pressure. Connect to a hydrant and watch the pressure gauges update in real-time to see how much you can theoretically flow in a situation. Pump Charts Create and organize your own quick-reference pump charts. Import and export individual charts as CSV files, or share complete chart collections using QR codes. Several ready-to-use default charts are also included. Custom Profiles Create apparatus- or department-specific profiles containing your own hoses, nozzles, appliances, coefficients, and preferred values. Save multiple profiles and quickly switch between department, apparatus, or training configurations. Easy QR Code Sharing Share profiles with students, instructors, and colleagues using QR codes. Scan a compatible QR code to import a profile without manually entering every setting. Interactive Study Mode Generate randomized multiple-choice questions using values from your selected profile. Choose one topic or combine multiple categories, including: • Handlines and master streams • Reduced hoselines • Fog and smoothbore nozzle reaction • Smoothbore GPM • Hydrant-flow methods • Relay pumping • Equal and unequal wye layouts • Manifolds and siamese connections • Deck-gun flow calculations Visual diagrams help you interpret each layout, and answer explanations reinforce the formulas and concepts behind the solution. Jump directly to a related reference topic when additional review is needed. Custom Charts Built-In Reference Library Review commonly taught Driver/Operator topics such as friction loss, hose coefficients, elevation pressure, smoothbore flow, nozzle reaction, hydrant flow, relay pumping, LDH, standpipes, siamese appliances, wyes, and manifolds. Offline Ready This app is designed as an offline educational tool. It is completely free, does not collect data, and does not request any permissions other than those necessary for functions like QR scanning. All core app features are completely functional without internet. Designed by a fire service Engineer and Driver/Operator Instructor as a flexible teaching, study, and classroom-training aid. ## Key features - Hoseline Calculator with custom segments - Friction loss, PDP, GPM, Nozzle Reaction - Customizable hose and nozzle settings - Interactive study mode with randomized questions - Offline functionality - Quick reference field topics ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/do-calcs-buddy/id6749918102/reviews.md ### 4/5 — Works *2025-12-13* It works but I’m having issues editing custom sizes and whatnot - the keyboard won’t drop and I can’t hit the save button. iPhone 11 **Developer response:** Hello, Thank you for the detailed feedback! I believe version 1.1.2 released on Jan 6, 2026 may have fixed all of the navigation issues on iOS. Please let me know if you continue to experience issues or have any other suggestions and I will address them promptly. Thank you for your support! ## Frequently asked questions about DO Calcs Buddy ### What is DO Calcs Buddy used for? DO Calcs Buddy is a training and reference tool for firefighters and driver/operators. It helps perform accurate hoseline calculations, covering topics like friction loss, pump discharge pressure, and nozzle reaction. ### Can I customize DO Calcs Buddy for my department? Yes, DO Calcs Buddy is highly customizable. You can set up specific hoses, nozzles, and appliances to match your department's equipment and share these settings with colleagues. ### Does DO Calcs Buddy require an internet connection? No, DO Calcs Buddy is offline ready. Once installed, you do not need an internet connection to use its features, making it convenient for use in various training environments. ### What kind of study features does DO Calcs Buddy offer? DO Calcs Buddy includes an interactive study mode with randomized D.O. questions on key topics like friction loss and relay pumping. The app breaks down the math step-by-step to aid learning. ### Is DO Calcs Buddy suitable for actual emergency operations? No, DO Calcs Buddy is intended solely as a training and reference tool. It does not replace formal training or department-approved procedures during actual emergency operations. ### What devices is DO Calcs Buddy available on? DO Calcs Buddy is available on iPhone, iPad, and iPod. It is designed for iOS devices. ### How often is DO Calcs Buddy updated? The latest version of DO Calcs Buddy is 1.1.2, and it was last updated on January 6, 2026. This indicates regular updates to maintain functionality and content. ### What is the age rating for DO Calcs Buddy? DO Calcs Buddy has an age rating of 4+. This suggests it is suitable for a wide range of users, including younger individuals learning about the subject matter. ## Version history (last 5 releases) ### 2.0.0 — 2026-08-24 • Finished the visual hydraulic calculator • Build custom layouts with hoses, nozzles, appliances, hydrants, standpipes, and multiple pumpers • New customizable pump charts • Share and import customizations using QR codes • Redesigned Study Mode with visual diagrams and better visual explanations • Improved profile and preset management • Refreshed resources, navigation, interface, and app icon • Performance improvements and bug fixes Thank you for using DO Calcs Buddy! ### 1.1.2 — 2026-01-06 -Complete User-Interface overhaul -Updated and improved study interface questions -Improved the Calculator -General overall functionality improvements, especially on iOS ### 1.0.8 — 2025-10-14 Added resource topics for standpipes, FDC's, and Phoenix Method. Updated iOS keyboard to be more user friendly on the calculator. ### 1.0.6 — 2025-08-31 Fixed appliance FL Added Foam & Standpipe support to Calculator Generally improved information contained in the Resources Tab ### 1.0.4 — 2025-08-22 Added "Done" button to keyboard on iOS to make the calculator easier to use. Also fixed some PSI / GPM defaults. ## Apps similar to DO Calcs Buddy | App | Rating | Price | Category | | --- | --- | --- | --- | | [IFSTA Driver/Operator 4](https://appshunter.io/ios/app/ifsta-driveroperator-4/id6748807805) | 2.0 (9) | Free | Education | | [IFSTA Instructor 9](https://appshunter.io/ios/app/ifsta-instructor-9/id1604765850) | 3.2 (17) | Free | Education | | [IFSTA Driver/Operator 3](https://appshunter.io/ios/app/ifsta-driveroperator-3/id6444622325) | 2.8 (24) | Free | Education | | [IFSTA Company Officer 6](https://appshunter.io/ios/app/ifsta-company-officer-6/id1584832170) | 2.0 (29) | Free | Education | | [IFSTA HazMat First Responder 6](https://appshunter.io/ios/app/ifsta-hazmat-first-responder-6/id6469591173) | 2.6 (14) | Free | Education | | [IFSTA ResourceOne](https://appshunter.io/ios/app/ifsta-resourceone/id6749885476) | — | Free | Education | --- *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 2026-08-25.*