Plumber Prep: Pipe Size Calc
Pass IPC & UPC Exam First Try
About
Calculate minimum pipe diameter and access over 500 practice questions for plumbing licensing exams. Study drainage, venting, and water supply systems offline with detailed code references. Track your progress to ensure exam readiness.
What's New in Plumber Prep
1.1
February 25, 2026
Fresh look, same powerful tools. - Updated to VoltExam brand identity - Improved DFU calculator interface - Added monthly subscription option alongside lifetime purchase - Performance improvements
MoreSubscription plans
Plumber Prep Pro Monthly
Full Access. Everything Unlocked.
In-App Purchases
$17.99
Pro — Lifetime Access
Unlimited questions, DFU calculator, IPC/UPC tools pro!
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FAQ
What is Plumber Prep's main function?
Plumber Prep's main function is to help users pass plumbing licensing exams by providing a pipe sizing calculator and over 500 practice questions. It covers drainage systems, DFU calculations, venting, and water supply, referencing actual code sections for detailed explanations.
Does Plumber Prep offer offline access?
Yes, Plumber Prep allows you to study offline. Every question and tool works without an internet connection, making it convenient for studying on job sites or during commutes.
What plumbing codes does Plumber Prep cover?
Plumber Prep covers the IPC 2021 & IPC 2024 (International Plumbing Code) and the UPC 2021 (Uniform Plumbing Code), which is used in California and western states.
How does Plumber Prep track user progress?
Plumber Prep tracks your scores by category, allowing you to identify and focus on your weak areas. This progress tracking helps you know when you are ready to take your licensing exam.
What are the subscription options for Plumber Prep Pro?
Plumber Prep Pro offers a monthly subscription for $3.99/month. This subscription provides unlimited practice questions, full access to the pipe sizing calculator, and all reference materials. It auto-renews monthly unless canceled.
How do I manage my Plumber Prep Pro subscription?
You can manage your subscription by going to Settings > Apple ID > Subscriptions on your device. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period.
What is the age rating for Plumber Prep?
Plumber Prep has an age rating of 4+, making it suitable for a wide range of users interested in plumbing education.
How often is Plumber Prep updated?
The latest version of Plumber Prep is 1.1, and it was last updated on February 25, 2026. This indicates a recent update, suggesting ongoing support and potential for future improvements.