# AmpGuide — Electrical field calculators

> Electrical field calculators (iPhone/iPad app by Robert Corbin.)

- Source: https://appshunter.io/ios/app/ampguide/id6771020745 (this page in markdown: same URL + `.md`)
- Developer: [Robert Corbin](https://appshunter.io/developer/1890247992)
- Category: Utilities
- Price: $2.99
- Age rating: 4+
- Requires: iOS 17.0 · 3 MB
- Languages: American English
- Released: 2026-05-20
- Data updated: 2026-08-23
- User reviews in markdown: https://appshunter.io/ios/app/ampguide/id6771020745/reviews.md

## What is AmpGuide?

AmpGuide is an electrical field reference and calculator suite for electricians, apprentices, inspectors, engineers, solar installers, EV installers, and serious DIY customers.

It brings common jobsite calculations into one offline workbench so you can check numbers, compare options, and keep notes without digging through separate utilities.

Version 2.5 includes 27 calculators plus Inspection Brief for saved Jobs. The app reviews the calculations in a job pack, assigns a readiness score, flags failing results, calls out missing core checks, and suggests the next actions to document before review.

Core tools include:
- Wire size calculator with ampacity and voltage-drop checks.
- Voltage drop for copper or aluminum, single-phase or three-phase.
- Ampacity tables with ambient and conductor-count derating.
- Breaker sizing for continuous and non-continuous loads.
- Conduit fill, box fill, Ohm's Law, and three-phase helpers.
- Standard and optional method service-load calculations.
- Transformer kVA sizing and NEC 450.3(B)-style OCPD guidance.
- Wire pull tension and jam-ratio checks.
- Grounding electrode and equipment grounding conductor sizing.
- Motor FLC, lighting demand, range demand, dryer demand, and fault-current tools.
- Solar PV string, EV charger, parallel conductor, burial depth, and bid-estimate workspaces.
- Conduit bender and wire color, resistor, thermocouple, and plug-pinout references.

AmpGuide is designed for quick field decisions and reviewable planning. It is an informational reference and calculator, not a substitute for the official NEC, engineering judgment, jobsite conditions, permits, inspections, or authority-having-jurisdiction requirements. Always verify final work against currently adopted code and local requirements.

Saved calculations and job notes stay on the device. AmpGuide does not request protected device permissions.


## Version history (last 5 releases)

### 2.6 — 2026-08-21

Adds Inspection Brief for saved Jobs, with readiness scoring, failed-result flags, missing-check callouts, and suggested documentation steps. This release also refreshes reliability across the electrical calculator suite.

### 2.5 — 2026-08-13

AmpGuide 2.5 adds the Inspection Brief workflow for saved Jobs and improves field accessibility.

- New readiness score for every saved job pack.
- Flags failed calculations.
- Calls out missing core checks such as wire size, breaker/OCPD, voltage drop, equipment grounding, and conduit or box capacity.
- Adds focused next-action notes for review.
- Job cards now show readiness at a glance.
- VoiceOver labels and hints now identify calculator tiles, tabs, inputs, favorites, and save actions.
- App Store metadata, website copy, and screenshots updated for the current UI.

### 2.3 — 2026-08-01

SelectivityDesk: Service-to-branch checks, field readings, punch lists, and inspection reports.

- Freeze service, panel, feeder, circuit, equipment, and applicable design basis
- Capture conductor, protection, load, voltage-drop, and fault-current evidence
- Review coordination assumptions without presenting a phone result as certification
- Record test readings, exceptions, owner, corrective action, and verification
- Export a punch list and inspection brief with source references

### 2.2 — 2026-07-02

NEW: Panel Schedule — document any panel, place breakers space by space with automatic tied-space handling, and export a clean circuit directory for the panel door or an inspection packet. The Calc Hub is now searchable (try an NEC article like 250.66), with pinned Favorites and a Recent row so your go-to calculators are one tap away. Jobs gained a one-tap report export that bundles every saved calculation with the inspection brief. Plus interface refinements throughout.

### 2.1 — 2026-06-30

AmpGuide 2.1 adds Inspection Brief for saved Jobs.

- New readiness score for every saved job pack.
- Flags failed calculations.
- Calls out missing core checks such as wire size, breaker/OCPD, voltage drop, equipment grounding, and conduit or box capacity.
- Adds focused next-action notes for review.
- Job cards now show readiness at a glance.
- App Store metadata, website copy, and screenshots updated for the current UI.

## More apps by Robert Corbin

- [Daily Word Journey](https://appshunter.io/ios/app/daily-word-journey/id6761548266)
- [Hush Secret Text](https://appshunter.io/ios/app/hush-secret-text/id6761658175)
- [Renew Guard](https://appshunter.io/ios/app/renew-guard/id6761755447)
- [Receipt to PDF](https://appshunter.io/ios/app/receipt-to-pdf/id6761782025)
- [Route Your Pay](https://appshunter.io/ios/app/route-your-pay/id6761783719)
- [Tip Arbiter](https://appshunter.io/ios/app/tip-arbiter/id6761786879)

All apps by Robert Corbin: https://appshunter.io/developer/1890247992

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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 2026-08-23.*