247+ iOS apps curated and reviewed
If you already know NEC Box & Conduit Calc, this is the deeper bench. 247+ electrical box fill calculator apps for iPhone, all reviewed and ranked by user rating, recency, and download trend as of August 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | 4.9★ (18) | Yes | Yes | Jul 2026 |
| 2 |  | Free was $2.99 | — | No | No | Jul 2026 |
| 3 |  | Free | 4.5★ (746) | No | No | Aug 2026 |
| 4 |  | $3.99 | 3.0★ (2) | No | No | May 2026 |
| 5 |  | Free | 2.8★ (4) | No | No | Jun 2026 |
| 6 |  | $0.99 | — | Yes | Yes | Jul 2026 |
| 7 |  | Free | 3.5★ (16) | No | No | May 2026 |
| 8 |  | Free | — | No | Yes | Aug 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 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 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 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 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 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.
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.
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.
