Calculate residential electrical service sizes accurately using NEC standards. This tool provides step-by-step breakdowns, references official articles, and supports multiple NEC editions for electricians and engineers.




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| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 | $0.99 | 3.0★ (4) | No | Yes | Aug 2026 | ||
| 2 | Free | — | No | Yes | Jul 2026 | ||
| 3 | Free | 4.6★ (197) | No | No | Aug 2026 | ||
| 4 | Free | 4.9★ (354) | No | Yes | Oct 2026 | ||
| 5 | Free | 5.0★ (3) | No | Yes | Oct 2026 | ||
| 6 | Free | 5.0★ (4) | No | Yes | Oct 2026 | ||
| 7 | Free | 5.0★ (1) | No | Yes | Oct 2026 | ||
| 8 | Free | — | Yes | Yes | May 2026 |




Calculate residential electrical service sizes accurately using NEC standards. This tool provides step-by-step breakdowns, references official articles, and supports multiple NEC editions for electricians and engineers.









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.