# VoltForge — Field Calculator & NEC Ref.

> Field Calculator & NEC Ref. (iPhone/iPad app by Clark Allen.)

- Source: https://appshunter.io/ios/app/voltforge/id6762475628 (this page in markdown: same URL + `.md`)
- Developer: [Clark Allen](https://appshunter.io/developer/1888902287)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.1 · 47 MB
- Languages: English
- Released: 2026-04-20
- Data updated: 2026-07-08
- User reviews in markdown: https://appshunter.io/ios/app/voltforge/id6762475628/reviews.md

## What is VoltForge?

Copy

Built for the field, not the classroom.
 
VoltForge puts precision calculators, NEC 2023 code references, and a professional job estimator in your pocket. Built for journeymen, master electricians, and apprentices who need fast, accurate answers on the job site.
 
Launch pad home screen. Light and dark mode. Large tap targets. Fully offline. No ads. No subscriptions.
 
FREE TOOLS
 
OHM'S LAW & VOLTAGE DROP
Solve for any value from any two inputs. Voltage drop supports 1-phase and 3-phase, copper and aluminum, 14 AWG to 500 kcmil, 120V to 600V. Auto-suggests correct wire size when over NEC 3% limit. Includes 3-phase kVA, kW, kVAR, and HP calculator.
 
FRACTION CALCULATOR
Tap-style keyboard with denominators from halves to 64ths. Add, subtract, multiply, and divide. Displays fraction and decimal simultaneously.
 
WIRE AMPACITY TABLE
NEC Table 310.15(B) for copper and aluminum, 14 AWG through 1000 kcmil. Includes derating calculator for conductor count and temperature correction table.
 
PRO TOOLS - One-time $4.99, yours forever
 
CONDUIT BENDING CALCULATOR
All six bend types: 90 Stub, Back-to-Back, Offset, 3-Point Saddle, 4-Point Saddle, Rolling Offset. Enter measurements in feet and inches. Marks display in feet and fractions to the nearest 1/8". EMT 1/2" through 4".
 
CONDUIT FILL CALCULATOR
EMT, IMC, RMC, PVC 40/80, HDPE, LFMC up to 4". THHN/THWN, XHHW, RHH/RHW-2, THW/THHW up to 1000 kcmil. Shows fill %, jam ratio per NEC Ch.9, and ampacity derating warning for 4+ conductors.
 
WIRE PULL TENSION CALCULATOR
Build your pull route segment by segment. Calculates cumulative tension through straights and bends. Flags sidewall pressure violations. Pass/fail result with remedies when over limit.
 
TRANSFORMER WIRING DIAGRAMS
7 configurations with schematic diagrams and field notes: 1-Phase 120/240V, 1-Phase 480V Step-Down, Delta-Wye, Wye-Delta, Delta-Delta, Wye-Wye, and Open Delta. Terminal reference and NEC field notes for each.
 
NEC QUICK REFERENCE
20 searchable NEC 2023 sections: Working Clearances, Box Fill, GFCI, AFCI, Breaker Sizing, Feeder Sizing, Grounding, Service Entrance, Conduit Fill, Load Calculations, Motor Calculations, Panelboard Rules, Transformers, Torque Specs, and more.
 
JOB ESTIMATOR + PDF EXPORT
Material list with markup, labor, permit fee, and tax. Generates a professional PDF with company info, customer details, scope of work, line items, and signature blocks. Share via email, AirDrop, or any iOS share sheet.
 
WHY VOLTFORGE
- NEC 2023 - current code, not years-old data
- Light and dark mode - tap to switch on the home screen
- Fully offline - works anywhere, no signal needed
- Fraction and feet/inches input - built for how electricians measure
- No ads, no subscription - Pro is one purchase, forever
- Large tap targets for gloved hands
 
All calculations are for planning purposes. Always verify with your local AHJ.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| VoltForge Pro | $4.99 | one-time |



## Version history (last 2 releases)

### 2.0 — 2026-05-16

Key changes from v1 description:

Added "Launch pad home screen. Light and dark mode." to the opening features line
Added Transformer Wiring Diagrams as its own Pro section
Added "Light and dark mode — tap to switch on the home screen" to the Why VoltForge list

### 1.0 — 2026-04-21

No release notes.

## More apps by Clark Allen

- [What's the Call?](https://appshunter.io/ios/app/whats-the-call/id6761323772)
- [What's the Call? Softball](https://appshunter.io/ios/app/whats-the-call-softball/id6761590742)
- [What's the Call? Flag Football](https://appshunter.io/ios/app/whats-the-call-flag-football/id6761696510)
- [What's the Call? Fast Pitch](https://appshunter.io/ios/app/whats-the-call-fast-pitch/id6762152590)
- [Trace Privacy](https://appshunter.io/ios/app/trace-privacy/id6762682869)

All apps by Clark Allen: https://appshunter.io/developer/1888902287

## Related topics

[field bend](https://appshunter.io/ios/topics/field-bend)

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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 2026-07-08.*