# Fixture Unit Calc Plumb — DFU & WSFU Calculator

> DFU & WSFU Calculator (iPhone/iPad app by Rizvan Adzhoian.)

- Source: https://appshunter.io/ios/app/fixture-unit-calc-plumb/id6765783513 (this page in markdown: same URL + `.md`)
- Developer: [Rizvan Adzhoian](https://appshunter.io/developer/1891746079)
- Category: Utilities, Business
- Price: $0.99 with in-app purchases
- Age rating: 17+
- Requires: iOS 13.0 · 33 MB
- Languages: English
- Released: 2026-05-04
- Data updated: 2026-06-25
- User reviews in markdown: https://appshunter.io/ios/app/fixture-unit-calc-plumb/id6765783513/reviews.md

## What is Fixture Unit Calc Plumb?

Fixture Unit Calculator helps you calculate Water Supply Fixture Units (WSFU) and Drainage Fixture Units (DFU) per the printed IPC tables — DFU per Table 709.1 and WSFU per Appendix E Table E103.3(2). Instantly determine total fixture load for any residential or commercial plumbing system to size water supply and drainage pipes correctly. Works 100% offline on the job site. Calculate fixture units in seconds instead of manually referencing code tables - reduce errors, speed up designs, ensure full code compliance.

FEATURES
- 26 Fixture Rows straight from the printed tables: bathroom groups (flush tank and flushometer), water closets (private/public, tank/valve), lavatories (private/public), bathtubs, showers (private/public), urinals (tank and 3/4" flushometer), kitchen/bar/service sinks, mop basins, laundry trays, clothes washers (private/public), dishwashers, bidets, drinking fountains, floor drains, and hose bibbs
- Dual Fixture Units: Calculate both WSFU (water supply) and DFU (drainage) simultaneously
- Printed Code Values: DFU per IPC Table 709.1; WSFU (total hot+cold) per Appendix E Table E103.3(2) with occupancy and supply control called out in every row
- Increment/Decrement Counters: Easily add or remove fixtures one at a time with plus/minus buttons
- Real-Time Totals: See total WSFU and DFU update instantly as you add fixtures
- Fixture Icons: Visual identification of fixture types for quick navigation
- Quick Input: Enter quantities directly or use counters for fast calculations

HOW IT WORKS
1. Browse the 26 fixture rows (bathroom groups, toilets, sinks, showers, urinals, etc.)
2. Use counters to add the quantity of each fixture in your project
3. App instantly calculates total WSFU and DFU values
4. Use WSFU for water supply pipe sizing calculations
5. Use DFU for drainage pipe sizing calculations

PERFECT FOR
- Plumbers sizing supply and drainage systems for new construction
- Journeyman plumbers and apprentices learning fixture units
- Plumbing contractors and estimators calculating material requirements
- Remodel plumbers adding fixtures to existing systems
- Mechanical estimators and engineers
- Plumbing inspectors verifying system design

OPTIONAL PRO UPGRADE — $2.99 ONE-TIME IN-APP PURCHASE
The following features require a separate one-time in-app purchase. They are not required to use the calculator:
• Unlimited saved calculation history
• PDF export of results
• Dark theme
• Ad-free experience

STANDARDS & COMPLIANCE
DFU values follow the printed IPC Table 709.1; WSFU values follow the printed IPC Appendix E Table E103.3(2) (total hot+cold, by occupancy and supply control). Values are identical across IPC 2018/2021/2024. Fixtures not listed in the printed tables (hose bibb, bar sink) are assigned by comparison as the code note instructs. Always confirm with your local code official.

PERFECT FOR
- Professional plumbers and contractors
- Journeyman and apprentice plumbers
- Mechanical engineers and estimators
- Plumbing inspectors
- Building contractors
- Plumbing educators and students

OFFLINE & PRIVACY
- Works 100% offline - calculate fixture units anywhere on the job site
- No account required - immediate access without signup
- No data collection - all calculations stored locally
- No internet dependency or cloud sync

Part of PlumbTools Suite - professional plumbing calculators and code reference tools. Calculate fixture units accurately, size systems faster, and ensure full IPC 2024 compliance with instant fixture unit calculations.

## Pricing and in-app purchases

Base price: $0.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Pro Unlock | $2.99 | one-time |



## Version history (last 3 releases)

### 1.0.5 — 2026-06-12

What's new:
- All fixture unit values now match the printed IPC tables: DFU per Table 709.1, WSFU per Appendix E Table E103.3(2)
- Occupancy and supply control named in every row
- Catalog extended to 26 rows: bathroom groups, public water closets, public shower

### 1.0.4 — 2026-05-18

What's new:
- Updated metadata for clarity per App Store guidelines
- Optional Pro upgrade is a separate one-time in-app purchase (not required for calculator features)

### 1.0.3 — 2026-05-04

No release notes.

## More apps by Rizvan Adzhoian

- [Conduit Fill Calculator-NEC](https://appshunter.io/ios/app/conduit-fill-calculator-nec/id6761846849)
- [Electrical Load Calc NEC](https://appshunter.io/ios/app/electrical-load-calc-nec/id6763250945)
- [Transformer Calc NEC](https://appshunter.io/ios/app/transformer-calc-nec/id6763311943)
- [Voltage Drop Calc NEC](https://appshunter.io/ios/app/voltage-drop-calc-nec/id6763312448)
- [Grounding Size Calc NEC](https://appshunter.io/ios/app/grounding-size-calc-nec/id6763312724)
- [Breaker Size Calc NEC](https://appshunter.io/ios/app/breaker-size-calc-nec/id6763312865)

All apps by Rizvan Adzhoian: https://appshunter.io/developer/1891746079

---

*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 2026-06-25.*