# Plumber Prep: Pipe Size Calc — Pass IPC & UPC Exam First Try

> Plumbing exam prep and pipe sizing calculator with practice questions and code references. (iPhone/iPad app by Deeun Inc..)

- Source: https://appshunter.io/ios/app/plumber-prep-pipe-size-calc/id6758053564 (this page in markdown: same URL + `.md`)
- Developer: [Deeun Inc.](https://appshunter.io/developer/1691824695)
- Category: Education, Utilities
- Price: Free with in-app purchases
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 17.0 · 7 MB
- Languages: American English
- Released: 2026-01-20
- Data updated: 2026-08-20
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/plumber-prep-pipe-size-calc/id6758053564/reviews.md

## What is Plumber Prep?

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/

## Key features

- Pipe diameter calculation
- 500+ practice questions
- IPC & UPC code coverage
- Offline study mode
- Progress tracking
- Reference tables

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Plumber Prep Pro Monthly | $6.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Pro — Lifetime Access | $17.99 | one-time |



## Frequently asked questions about Plumber Prep

### 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.

## Version history (last 2 releases)

### 1.1 — 2026-02-25

Fresh look, same powerful tools.
- Updated to VoltExam brand identity
- Improved DFU calculator interface
- Added monthly subscription option alongside lifetime purchase
- Performance improvements

### 1.0 — 2026-01-21

No release notes.

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All apps by Deeun Inc.: https://appshunter.io/developer/1691824695

## Related topics

[pipes plumber](https://appshunter.io/ios/topics/pipes-plumber) · [water pipe sizing plumb](https://appshunter.io/ios/topics/water-pipe-sizing-plumb)

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*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 2026-08-20.*