# Electrical Calc USA

> Professional electrical calculator for NEC code compliance and complex calculations. (iPhone/iPad app by Snappy Appz Inc..)

- Source: https://appshunter.io/ios/app/electrical-calc-usa/id391412994 (this page in markdown: same URL + `.md`)
- Developer: [Snappy Appz Inc.](https://appshunter.io/developer/375591377)
- Category: Utilities, Productivity
- Price: $6.99
- Rating: 3.50/5 from 2 App Store ratings · 7 written reviews indexed
- Age rating: 4+
- Requires: iOS 8.0 · 15 MB
- Languages: English
- Released: 2010-09-18
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/electrical-calc-usa/id391412994/reviews.md

## What is Electrical Calc USA?

E-Calc is a professional electrical application for calculating many common electrical problems.  This app is an essential tool for all electricians and electrical engineers.  Unlike other similar apps E-Calc not only calculates simple formulas but returns code results including wire sizing, conduit sizing, fusing, overload size, ground and bond size and much more based on the National Electrical Code.  The features of this app are too long to list but here are a few of the key ones;

- Basic construction calculator allows you to easily divide rooms for lighting in imperial or metric measurements.

- Calculate any single motor and get maximum overcurrent, maximum overload, minimum wire, minimum pipe, and minimum bond wire size.

- Calculate any transformer size and get KVA, FLA, pipe size, fuse and breaker size, bond size and ground size, on both primary and secondary.  Easily choke down the transformer and get appropriate results for the modified demand load.

- Create any number of panel legends of any size and save as pdf, csv, or print them directly from your device.

- Calculate complex box fill or basic chart based box fill.

- Calculate the allowable ampacity of any wire type and deration situation.

- Calculate maximum number of similar sized wires in a given pipe size.

- Calculate pipe size required for a list of any number, size, and type of wire.

- Calculate required ground and bonding sizes.

- Easily calculate complicated voltage drop calculations.  Get results for percentage voltage drop as well as maximum lengths of runs.  Derating is also supported.

- Calculate ohm's law, motor fla, drill and tap sizes and voltage unbalance in the 'handy' module.

- Calculate recommeneded torque settings for all varieties of lugs and terminations.

- Convert many common units.

- Find NEMA codes and specs of receptacles.

- Easily access in app support with quick links to your phone's email.

## Key features

- Wire and conduit sizing
- Fusing and overload calculations
- Transformer and panel legend creation
- Box fill calculations
- Voltage drop calculations
- Unit conversions

## Recent user reviews (7 of 7)

All indexed reviews: https://appshunter.io/ios/app/electrical-calc-usa/id391412994/reviews.md

### 2/5 — Motor calcs don't have HP?

*2016-02-04, version 4.2.0*

No horsepower on the motor calc screen!  Really?  What else is missing?

### 5/5 — Very usefull app

*2014-10-16, version 4.0.2*

This is a great program. I have used Electrical Calc for both my office and in the field for verifying electricians box fills. Very easy to use. Snappy Apps is fantastic to deal with and very responsive to requests.

### 5/5 — Excellent !

*2014-05-23, version 3.8.1*

Can't do without it. Especially when it's time to back up your statements with a non believer

### 5/5 — The best rolo in my iPhone

*2014-04-12, version 3.7.0*

Useful
Intuitive
100% recommend

### 4/5 — Great

*2014-02-24, version 3.6.2*

Great app. Very helpful.

### 1/5 — Terrible

*2012-06-27, version 2.0.2*

This app doesn't work as described waste of money!!!

### 2/5 — Don't waste your money

*2012-02-02, version 2.0.2*

Ampacity calc doesn't agree with NEC.  Drill and tap size calc doesn't display as described.  After downloading, I discover an article saying this app is based on CEC.

## Frequently asked questions about Electrical Calc USA

### What electrical calculations does Electrical Calc USA perform?

Electrical Calc USA calculates wire sizing, conduit sizing, fusing, overload size, ground and bond size, transformer KVA and FLA, panel legends, box fill, allowable ampacity, voltage drop, and Ohm's law, all based on the National Electrical Code.

### Is Electrical Calc USA suitable for both basic and complex electrical tasks?

Yes, the app handles basic construction calculations for lighting and simple formulas, as well as complex tasks like transformer calculations with demand load adjustments and detailed voltage drop scenarios with derating.

### Can I save and export my calculations from Electrical Calc USA?

You can create and save panel legends of any size, and then export them as PDF or CSV files, or print them directly from your device.

### What devices is Electrical Calc USA compatible with?

Electrical Calc USA is available for iPhone, iPad, iPod, and Apple Watch, making it accessible across various Apple devices.

### How often is Electrical Calc USA updated?

The app was last updated on November 27, 2018, with version 4.2.5. Users can expect updates to maintain compatibility and potentially add new features over time.

### What is the price of Electrical Calc USA?

Electrical Calc USA is a paid application, priced at $6.99. This one-time purchase provides access to all its professional electrical calculation features.

### What is the age rating for Electrical Calc USA?

Electrical Calc USA has an age rating of 4+, indicating it is suitable for a wide range of users, including younger individuals who may be learning about electrical concepts.

### Does Electrical Calc USA offer in-app support?

Yes, Electrical Calc USA provides easy access to in-app support with quick links to your phone's email, allowing users to get assistance when needed.

## Version history (last 1 release)

### 4.2.5 — 2018-11-27

- Fixed an issue with overcorrect calculations in the transformer module.

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## More apps by Snappy Appz Inc.

- [Electrical Calc](https://appshunter.io/ios/app/electrical-calc/id375591374)
- [Construction Calc Lite](https://appshunter.io/ios/app/construction-calc-lite/id380648615)
- [Construction Calc Pro](https://appshunter.io/ios/app/construction-calc-pro/id458909118)
- [The Best No Smoking App](https://appshunter.io/ios/app/the-best-no-smoking-app/id458916516)
- [Electrical Calc Pro](https://appshunter.io/ios/app/electrical-calc-pro/id514793318)

All apps by Snappy Appz Inc.: https://appshunter.io/developer/375591377

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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 2026-06-10.*