225+ iOS apps curated and reviewed
If you already know NEC Box & Conduit Calc, this is the deeper bench. 225+ electrical box fill calculator apps for iPhone, all reviewed and ranked by user rating, recency, and download trend as of July 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | 4.9★ (17) | Yes | Yes | Jun 2026 |
| 2 |  | Free | 3.5★ (16) | No | No | May 2026 |
| 3 |  | Free | 4.5★ (746) | No | No | Jul 2026 |
| 4 |  | Free | 2.8★ (4) | No | No | Jun 2026 |
| 5 |  | $0.99 | — | Yes | Yes | Jun 2026 |
| 6 |  | Free | 4.6★ (197) | No | No | Jun 2026 |
| 7 |  | $3.99 | 3.0★ (2) | No | No | May 2026 |
| 8 |  | $4.99 | — | No | Yes | Jun 2026 |
Calculate electrical box and conduit fill accurately according to the NEC. This app provides instant, reliable calculations for electricians, contractors, and students, saving time on job sites. It offers support for various box and conduit types, conductor sizes, and includes wire volume data.
This free tool consolidates essential electrical calculations and reference guides into a single app. It offers precise tools for conduit bending, wire sizing, voltage drop, and conduit fill, designed to enhance fieldwork efficiency and accuracy for professionals. The app functions offline, ensuring constant access to critical information.
This tool assists electricians, engineers, and contractors in determining the correct conduit size based on NEC guidelines. It calculates conduit fill percentages and jam probability, saving time compared to manual calculations.
This app simplifies electrical wiring box fill calculations with detailed breakdowns by wire size and component. It offers an optional cable counting mode and includes volumes for standard boxes and plaster rings for quick reference. Results are displayed on a single screen for easy access and can be shared via email.
This app provides essential calculations for electricians, inspectors, contractors, and engineers. It helps determine conductor sizing, circuit protection, race sizing, and grounding conductor sizes for various electrical equipment and services.
This utility app helps electricians and contractors perform precise electrical box fill calculations according to the latest codes. It also includes a comprehensive construction calculator for dimensional math, area, volume, and right-angle solutions.
This app simplifies electrical box fill calculations for any job size. It allows users to create and save unlimited calculations, solve for various box sizes, and export results to spreadsheets or print directly. It supports current electrical code standards and includes a built-in construction calculator.
This app provides electricians and electrical professionals with a powerful tool for performing complex calculations based on the latest National Electrical Code (NEC). It offers solutions for wire sizing, voltage drop, conduit sizing, and motor calculations, saving time and ensuring code compliance.
This app provides electricians with fast, reliable electrical calculations for the jobsite. It offers practical tools for conduit fill, ampacity, voltage drop, and more, ensuring consistent results quickly. Designed for professionals who need dependable tools without unnecessary features.
This app provides electricians and electrical professionals with up-to-date digital information based on the National Electrical Code. It includes formulas, wiring diagrams, conduit bending guides, and calculators for various electrical calculations. The app is designed for on-the-job reference and works offline.
Test your electrical knowledge daily with a new question based on the US electrical code. Perfect for apprentices, journeymen, and masters seeking to learn or refresh their understanding of electrical concepts and regulations.
Calculate the appropriate wire size for electrical circuits. This tool helps determine wire size based on voltage drop and current carrying capacity, ensuring compliance with NEC ampacity limits.
This app provides electrical code and design calculations for professionals working with wiring systems. It includes tools for ampacity, wire sizing, box fill, and conduit fill, based on the 2011 National Electrical Code.
This app provides a comprehensive suite of electrical calculations for professionals. It supports various international standards and offers detailed reports in PDF format. The tool covers wiring, power, motor, and electronic calculations, along with extensive conversion tables and resources.
This electronic pocket reference guide provides essential information for electrical professionals. It offers calculations, code tables, and detailed sections on motors, ampacities, grounding, and more, all accessible on your mobile device.
This utility app offers a clean and intuitive interface for performing calculations. It prioritizes a user-friendly design with large buttons and a clear display for quick and efficient use.