Convert Oersteds to Amperes per metre
Convert Oersteds (Oe) to Amperes per metre (A/m) instantly and accurately.
Conversion Formula
A/m = Oe × 79.57747155
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 metre
The ampere per metre (A/m) is the SI coherent unit of magnetic field strength H, expressing the magnetomotive force per unit length. It defines how strongly a field drives magnetic flux through a material. Earth's geomagnetic H field is approximately 40-60 A/m; a typical transformer core operates at 100-1000 A/m. 1 A/m = 1 A m⁻¹.
Quick Reference Table
| Oersteds (Oe) | Amperes per metre (A/m) |
|---|---|
| 1 Oe | 79.5775 A/m |
| 2 Oe | 159.155 A/m |
| 5 Oe | 397.887 A/m |
| 10 Oe | 795.775 A/m |
| 25 Oe | 1989.44 A/m |
| 50 Oe | 3978.87 A/m |
| 100 Oe | 7957.75 A/m |