# Cerrowire Calculators > NEC conduit sizing and fill calculations for electrical wiring. (iPhone/iPad app by Cerro Wire LLC.) - Source: https://appshunter.io/ios/app/cerrowire-calculators/id1440292951 (this page in markdown: same URL + `.md`) - Developer: [Cerro Wire LLC](https://appshunter.io/developer/546010607) - Category: Utilities - Price: Free - Rating: 5.00/5 from 5 App Store ratings · 2 written reviews indexed - Age rating: 4+ - Requires: iOS 8.0 · 32 MB - Languages: American English - Released: 2018-11-28 - Data updated: 2026-06-06 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/cerrowire-calculators/id1440292951/reviews.md ## What is Cerrowire Calculators? Looking for a quick and easy way to size conduit per the NEC? Cerro Wire LLC (Cerrowire) created this app to help you figure out what size conduit to use for copper and aluminum building wire. Two calculators allow you to determine what is the maximum number of conductors that will fit in a type and size of raceway, or what size raceway is required for the type(s) and size(s) of conductors in your circuit. All results are based on the National Electrical Code®. The app can be used to calculate raceway size or fill for EMT, PVC, RMC, etc., with insulated and bare copper and/or aluminum conductors. (Stay tuned for more calculators that will be added in the near future!) Cerrowire is headquartered in Hartselle, Alabama. Cerrowire is a copper wire manufacturing company with plants in Alabama, Georgia, Indiana, and Utah. We supply building wire and cable throughout North America for commercial, industrial and residential use. Our products are available through electrical distributors, wholesalers, and retailers. Cerrowire – a Marmon/Berkshire Hathaway company – follows the time-tested business model of our parent company to continually improve both our process and our products in order to offer advantages that meet the needs of customers. The end results for our customers are products, packaging, services, and tools that anticipate and fill the ever-evolving needs of the competitive construction industry. ## Key features - NEC conduit fill calculations - Conduit sizing for conductors - Supports copper and aluminum wire - Calculates for various raceway types (EMT, PVC, RMC) - Based on National Electrical Code® ## Recent user reviews (2 of 2) All indexed reviews: https://appshunter.io/ios/app/cerrowire-calculators/id1440292951/reviews.md ### 5/5 — Very handy and easy to use *2019-06-28* Very handy app, easy and fast access to the raceway calculations. I hope the app continues to grow and provide us with a lot of useful information quickly. ### 5/5 — Owner *2019-02-13* App will not work with latest iPhone update hope this can be. Corrected I use it very often thanks D & L Electric ## Frequently asked questions about Cerrowire Calculators ### What is Cerrowire Calculators used for? Cerrowire Calculators helps users determine the correct conduit size and fill based on National Electrical Code (NEC) standards. It calculates the maximum number of conductors that can fit in a raceway or the required raceway size for specific conductors. ### What types of wire does Cerrowire Calculators support? The app supports calculations for both copper and aluminum building wire, including insulated and bare conductors. ### Does Cerrowire Calculators work offline? The provided data does not specify offline functionality. However, as a calculation tool, it is likely designed to function without an active internet connection once installed. ### What raceway types can be calculated with Cerrowire Calculators? Cerrowire Calculators can be used to calculate raceway size or fill for various types including EMT, PVC, and RMC. ### Is Cerrowire Calculators free to use? Yes, Cerrowire Calculators is available for free. The app is listed as 'Free' with no mention of in-app purchases or subscriptions. ### On which devices can I use Cerrowire Calculators? Cerrowire Calculators is available for iPhone, iPad, and iPod devices. It is designed for iOS operating systems. ### How often is Cerrowire Calculators updated? The app was last updated on March 30, 2020, with version 1.3. Future updates are planned to add more calculators. ### What is the age rating for Cerrowire Calculators? Cerrowire Calculators has an age rating of 4+. This indicates it is suitable for users of all ages. ## Version history (last 4 releases) ### 1.3 — 2020-03-30 We are introducing the new Ampacity Calculator ### 1.2 — 2019-03-15 Minor UI changes and functionality updated. ### 1.1 — 2018-12-05 Simple UI fixes ### 1.0 — 2018-11-27 No release notes. ## Apps similar to Cerrowire Calculators | App | Rating | Price | Category | | --- | --- | --- | --- | | [Fault Current Calculator](https://appshunter.io/ios/app/fault-current-calculator/id647477910) | 3.1 (23) | Free | Utilities | | [ElectriCalc Pro](https://appshunter.io/ios/app/electricalc-pro/id569677304) | 4.9 (256) | Free | Utilities | | [Wire Calculator](https://appshunter.io/ios/app/wire-calculator/id1297230197) | 1.0 (1) | Free | Utilities | | [Span Installer](https://appshunter.io/ios/app/span-installer/id1477128965) | 4.3 (11) | Free | Utilities | | [Mike Holt's Electrical Toolbox](https://appshunter.io/ios/app/mike-holts-electrical-toolbox/id1406630647) | 4.6 (198) | Free | Utilities | | [Partial Reel Calculator](https://appshunter.io/ios/app/partial-reel-calculator/id489177969) | 2.5 (11) | Free | Utilities | ## Related topics [cerro wire llc](https://appshunter.io/ios/topics/cerro-wire-llc) · [cerrowire calculators](https://appshunter.io/ios/topics/cerrowire-calculators) --- *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 2026-06-06.*