DO Calcs Buddy

DO Calcs Buddy is your ultimate pump operator's toolkit — designed for firefighters, engineers, and driver/operators to perform accurate and efficient hoseline calculations in classroom and training environments.

Whether you're on the fireground or studying for your D.O. certification, DO Calcs Buddy provides friction loss, pump discharge pressure (PDP), GPM, Nozzle Reaction, and many more topics — all in one clean, intuitive interface.

Best of all — this app is completely customizable to use your department's specific hoses, nozzles, and appliances. Custom coefficients? Take the time to set it up and share the settings with your colleagues easily. Or take advantage of a handful of preset settings to choose from.

Features: Hoseline Calculator: Customize hose layouts with multiple segments, wyes, and siamese connections in seconds. Account for elevation and any custom nozzles or hoses.

Resource Topics: Quick reference field topics for Driver/Operators like the hand method, standpipes, and many more.

Profile-Based Settings: Save and switch between different department or training configurations for Quiz and Reference Topics

Interactive Study Mode: Sharpen your knowledge with randomized D.O. questions on FL, GPM, nozzle reaction, relay pumping, and more - with all numbers randomly generated from the profiles that you customize. Pick any topic you'd like, and watch the app break down the math for you piece-by-piece as you learn how to solve any fire-ground hose-lay.

Offline Ready: No internet connection required after install.

Designed by a fire service Engineer and Driver/Operator Instructor to assist in teaching and as a handy reference tool for any pump operator's pocket.

DISCLAIMER: This app is intended solely as a training and reference tool. Always follow your department’s standard operating procedures (SOPs), manufacturer guidelines, pump charts, and local policies during actual emergency operations.

Furthermore, this app is not affiliated with, endorsed by, sponsored by, or approved by any fire apparatus manufacturer, hose or nozzle manufacturer, trade organization, certification body, training institution, or government agency. While all attempts are made to prevent any branding or trademarks from being included in the app, any product names, trademarks, and registered trademarks that may appear or be referenced by users within the app are the property of their respective owners and are used for educational and identification purposes only.

Use of this app does not replace formal training, certification, or department-approved procedures. The developer assumes no responsibility for decisions or actions taken during real-world operations.