Magnetic Field Strength Converter

About the magnetic field strength converter

Magnetic field strength (H) describes the magnetizing influence of currents and magnets, independent of the response of any material. The SI unit is the ampere per meter (A/m); the CGS counterpart is the oersted (Oe), where 1 Oe ≈ 79.577 A/m. H is what you compute directly from currents using Ampère’s law and is essential for designing inductors, MRI gradients, and magnetic recording heads.

Frequently asked questions

• What is the difference between H and B? +

  H (A/m) is the applied magnetic field; B (tesla) is the resulting flux density inside a material. They are related by B = μ₀(H + M), where M is the magnetization.

• How do I convert oersted to A/m? +

  Multiply by 1000/(4π) ≈ 79.577. So 100 Oe ≈ 7,958 A/m.