Magnetic Field Strength Converter — A/m & Oersted

Convert magnetizing field strength between amperes per meter, kiloamperes per meter, and oersteds.

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How this conversion works. Field strength is converted through A/m; the oersted uses the exact 1000/4π relation given in NIST Special Publication 811.

How to use

  1. Pick the unit you are converting from, such as Kiloampere per meter (kA/m) or Ampere per meter (A/m).
  2. Type the value and every other unit updates as you type.
  3. Copy the figure you need, or use the swap button to reverse the direction, Millioersted (mOe) included.

Frequently asked questions

How do I convert oersted to ampere per meter?

1 oersted = 79.5775 ampere per meter. Choose "Oersted (Oe)" as From and "Ampere per meter (A/m)" as To, type a value, and the result updates instantly.

Why is the oersted factor 1000/4π?

CGS electromagnetic units absorb a 4π into the field definitions. Converting to SI reintroduces it: 1 Oe = 1000/(4π) ≈ 79.577 A/m.

Where is field strength used instead of flux density?

Magnet coercivity (Hc) and coil magnetizing fields are quoted in Oe or kA/m. Inside a material, B = µ₀(H + M) — H is what your coil applies, B is what results.

Is my data sent to a server?

No. Conversions run entirely in your browser using fixed factors — nothing is uploaded or logged.

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