Plumber Prep: Pipe Size Calc
Pass IPC & UPC Exam First Try
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
NEW: IPC 2024 code questions added. Calculate DFU pipe sizing instantly — the tool every plumber uses on the job.
Calculate minimum pipe diameter in seconds. The DFU Pipe Sizing Calculator lets you tap to add fixtures — water closets, lavatories, showers, tubs — and instantly see the minimum drain pipe size per IPC Table 710.1.
This is the tool you'll keep using after you pass the exam.
500+ PRACTICE QUESTIONS
Covering drainage systems, DFU calculations, venting requirements, trap seals, water supply sizing, backflow prevention, gas piping (IFGC), and storm drainage. Every question includes a detailed explanation referencing the actual code section.
COMPLETE CODE COVERAGE
- IPC 2021 & IPC 2024 — International Plumbing Code
- UPC 2021 — Uniform Plumbing Code (California & western states)
PIPE SIZE REFERENCE
Quick lookup tables for drain pipe sizing by DFU, vent pipe sizing by trap size, water supply sizing, and slope requirements.
STUDY OFFLINE
Every question and tool works without internet. Study on the job site, on the commute, or during downtime.
PROGRESS TRACKING
See your scores by category. Focus on weak areas. Know when you're ready to sit for the exam.
SUBSCRIPTION INFORMATION
Plumber Prep Pro Monthly: $3.99/month
- Unlimited practice questions
- Full pipe sizing calculator
- All reference materials
- Auto-renews monthly
Payment will be charged to your Apple ID account. Subscription automatically renews unless canceled at least 24 hours before the end of the current period. Manage subscriptions in Settings > Apple ID > Subscriptions.
Download now. Pass your plumber licensing exam the first time.
Privacy Policy: https://www.voltexam.com/privacy
Terms & Conditions: https://www.voltexam.com/terms
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
Fresh look, same powerful tools.
- Updated to VoltExam brand identity
- Improved DFU calculator interface
- Added monthly subscription option alongside lifetime purchase
- Performance improvements
The developer, Deeun Inc., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Deeun Inc.
- Size
- 6.9 MB
- Category
- Education
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Pro — Lifetime Access $17.99
- Plumber Prep Pro Monthly $6.99
- Copyright
- © 2026 Deeun Inc.