Calculate the correct wire gauge for electrical circuits using official NEC ampacity tables and derating factors. Supports various load types, conductor materials, insulation, and installation methods. Works entirely offline for on-site use.




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With an average user rating of 4.6★, the wire size calc category is one of the App Store's strongest. Browse all 242+ apps we track, sorted so the most loved ones surface first.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 | $0.99 | 5.0★ (1) | No | Yes | Oct 2026 | ||
| 2 | Free | 4.6★ (1.5K) | No | No | Nov 2026 | ||
| 3 | Free | — | No | Yes | Nov 2026 | ||
| 4 | $3.99 was $7.99 | — | No | No | Oct 2026 | ||
| 5 | $2.99 | 5.0★ (24) | No | No | Oct 2026 | ||
| 6 | Free | — | No | No | Jun 2026 | ||
| 7 | Free | — | No | Yes | Aug 2026 | ||
| 8 | Free | 5.0★ (1) | No | No | Aug 2026 |




Calculate the correct wire gauge for electrical circuits using official NEC ampacity tables and derating factors. Supports various load types, conductor materials, insulation, and installation methods. Works entirely offline for on-site use.






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.





