Magnetic Field Strength Converter — A/m, Oersted, kA/m
Convert between 5 units of magnetic field strength (H-field) — A/m, kA/m, mA/m, oersted (Oe), and Gilbert/cm. Earth's H-field is approximately 40–50 A/m. The coercivity of neodymium magnets exceeds 1,000,000 A/m. H-field differs from B-field (flux density): H describes the magnetising force, B describes the resulting flux. Used in permanent magnet design, data storage media and EMC engineering.
About the Magnetic Field Strength Converter
Magnetic field strength (H-field) represents the magnetic force generated by free currents independent of the material it passes through, measured in amperes per metre (A/m). It differs from magnetic flux density (B-field) in that it does not account for the magnetisation of the medium. The oersted (Oe) is the CGS unit still used in magnetic materials data sheets. The H-field is critical in designing electromagnets, inductors, and magnetic shielding.
- ›Earth's magnetic field is approximately 40–50 A/m (50–65 Oe) at the surface
- ›The coercivity of a permanent magnet (resistance to demagnetisation) is measured in A/m or Oe
- ›High-performance neodymium magnets have coercivity exceeding 1,000,000 A/m
- ›Magnetic field strength inside an MRI solenoid can reach several million A/m
A/m to Oersted — Conversion Table
| A/m (A/m) | Oersted (Oe) |
|---|---|
| 1 A/m | 0.012566 Oe |
| 2 A/m | 0.025133 Oe |
| 5 A/m | 0.062832 Oe |
| 10 A/m | 0.12566 Oe |
| 20 A/m | 0.25133 Oe |
| 50 A/m | 0.62832 Oe |
| 100 A/m | 1.25664 Oe |
| 1,000 A/m | 12.5664 Oe |
Last updated: August 17, 2026 · Calculated using SI-validated constants (NIST)
Frequently Asked Questions
What units does the Magnetic Field Strength Converter — A/m, Oersted, kA/m support?
The Magnetic Field Strength Converter — A/m, Oersted, kA/m supports multiple units with instant conversion. Convert between 5 units of magnetic field strength (H-field) — A/m, kA/m, mA/m, oersted (Oe), and Gilbert/cm. Earth's H-field is approximately 40–50 A/m. The coercivity of neodymium magnets exceeds 1,000,000 A/m. H-field differs from B-field (flux density): H describes the magnetising force, B describes the resulting flux. Used in permanent magnet design, data storage media and EMC engineering. All results use SI-validated constants accurate to 8 significant figures.
Is this Magnetic Field Strength Converter — A/m, Oersted, kA/m free?
Yes — completely free. No registration, no limits. Works on all devices including mobile.
How accurate is this converter?
Accurate to 8 significant figures using precise mathematical constants validated against international SI standards (NIST and ISO 80000).