Convert Oersteds to Amperes per inch
Convert Oersteds (Oe) to Amperes per inch (A/in) instantly and accurately.
Conversion Formula
A/in = Oe × 2.021267777
About Oersteds
The oersted (Oe) equals exactly 1000/(4π) A/m ≈ 79.577 A/m, the CGS unit of magnetic field strength named after Hans Christian Ørsted. Still widely used in permanent magnet characterisation (NdFeB, SmCo, AlNiCo), magnetic recording, and older MRI literature. Earth's surface field is ≈ 0.5 Oe; a typical speaker magnet ≈ 5000 Oe. 1 Oe = 1000/(4π) A/m.
About Amperes per inch
The ampere per inch (A/in) equals 1/0.0254 A/m ≈ 39.370 A/m. Standard unit in US magnetic core and inductor datasheets from manufacturers like Magnetics Inc. and Ferroxcube; B-H curves and core loss specifications for powder cores and ferrites are commonly plotted in Oe (H-axis) or A/in in North American catalogs. 1 A/in = 1/0.0254 A/m ≈ 39.37 A/m.
Quick Reference Table
| Oersteds (Oe) | Amperes per inch (A/in) |
|---|---|
| 1 Oe | 2.02127 A/in |
| 2 Oe | 4.04254 A/in |
| 5 Oe | 10.1063 A/in |
| 10 Oe | 20.2127 A/in |
| 25 Oe | 50.5317 A/in |
| 50 Oe | 101.063 A/in |
| 100 Oe | 202.127 A/in |