Calculate the magnetic field inside a long solenoid with instant results. Input current, length, or turns and get precise calculations with support for various units and up to 16 decimal places. Formulas are included for reference.






249+ iOS apps curated and reviewed
The best solenoid magnetic field calc apps on iPhone average 4.0★ across 249+ titles — we've ranked them by what real users actually keep on their phones. Updated October 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 | $2.99 | 1.0★ (1) | No | No | Oct 2026 | ||
| 2 | Free | — | No | No | May 2026 | ||
| 3 | $2.99 | 4.0★ (1) | No | No | May 2026 | ||
| 4 | $2.99 | 5.0★ (1) | No | No | May 2026 | ||
| 5 | Free | 5.0★ (8) | No | Yes | Oct 2026 | ||
| 6 | Free | 4.8★ (2.4K) | No | Yes | Oct 2026 | ||
| 7 | Free | 4.2★ (1.4K) | No | No | Nov 2026 | ||
| 8 | $3.99 | — | No | No | Sep 2026 |






Calculate the magnetic field inside a long solenoid with instant results. Input current, length, or turns and get precise calculations with support for various units and up to 16 decimal places. Formulas are included for reference.











Calculate magnetic fields from electric currents with four distinct modes. Solve for any variable, visualize with interactive diagrams, and utilize flexible unit support. Works offline for convenience.