Works
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
Free
About
This app helps firefighters and engineers perform hoseline calculations for training and certification. It offers customizable settings for specific departments and includes interactive study modes for various pump operator topics. The tool is designed for offline use and provides quick reference field topics.
✓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
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What's New in DO Calcs Buddy
1.1.2
January 6, 2026
-Complete User-Interface overhaul -Updated and improved study interface questions -Improved the Calculator -General overall functionality improvements, especially on iOS
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FAQ
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.