Journeyman Field Pro Electric
Electrical & Low Voltage Calc
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Journeyman Field Pro puts electrical and low-voltage calculations, a plain-language code assistant, and field guides in one app — fast, accurate, and offline on the job.
ELECTRICAL — 9 CALCULATORS
- Voltage Drop (single & 3-phase, copper/aluminum)
- Wire Sizing (ampacity check with bundle derating)
- Conduit Fill (EMT, IMC, RMC, PVC)
- Ohm's Law (solve V, I, R, or P)
- Load Calculator (service sizing, 125% rule)
- Conduit Bending (offsets, saddles, 3-point, 4-point)
- Box Fill (NEC 314.16 volume method)
- Motor FLA (conductor & OCPD sizing)
- NEC Quick Reference
LOW VOLTAGE — 9 CALCULATORS
- Fire Alarm Voltage Drop (NFPA 72 NAC)
- Camera Power / Voltage Drop
- PoE Budget (IEEE 802.3 af/at/bt)
- DC Wire Sizing
- Battery Backup (standby + derate)
- Strobe / Candela Spacing
- Cable Pull Tension
- Speaker Line Loss (70V + low-impedance)
- LV Quick Reference
ASK THE CODE — AI ASSISTANT
Ask a question in plain English and get an answer with the exact NEC or NFPA 72 article reference. Pick your code edition. No more flipping through a codebook on a ladder.
FIELD GUIDES
Short, plain-language how-to guides written for working techs — voltage drop, wire sizing, motor circuits, PoE budgeting, grounding vs bonding, strobe placement, and more. Each one ends with the key takeaways.
SAVE & ORGANIZE
Save any result or code answer and pull it back up later — all stored on your device, available offline. Star your go-to calculators to pin them to the top.
BUILT FOR IPHONE AND IPAD
A layout that makes real use of the screen, whether you're on a phone in your pouch or an iPad in the truck.
No account, no login, no sign-up. The calculators and guides work with no internet connection at all.
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Journeyman Pro is an optional auto-renewing subscription: $4.99/month with a 7-day free trial. It unlocks the AI code assistant (Ask the Code) and 10 advanced calculators; all other calculators are free. Payment is charged to your Apple ID at confirmation of purchase and the subscription renews automatically unless canceled at least 24 hours before the end of the period. Manage or cancel anytime in your Apple ID Account Settings.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://journeyman.ragingrhinogroup.com/privacy
Ratings & Reviews
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Journeyman is now free to download.
NEW — Journeyman Pro (start with a 7-day free trial, then $4.99/month):
• Ask the Code — an AI NEC & NFPA 72 assistant that does the math and gives you the answer (conduit size, breaker size, wire gauge), not just the rule
• 10 advanced calculators: Load Calc, Motor FLA, Conduit Bending, NEC & LV Quick Reference, Fire Alarm voltage drop, strobe/candela spacing, battery backup, cable pull, speaker loss
Every everyday calculator stays free. Anyone who already purchased the app keeps full access at no charge.
The developer, Billy Jackson, 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
- Billy Jackson
- Size
- 35.2 MB
- Category
- Utilities
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPad
Requires iPadOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 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
- Journeyman Pro $4.99
- Copyright
- © 2026 Billy Jackson