Magnetic Field Strength Converter

Convert magnetic field strength between dBµA/m, A/m, Tesla, Gauss, and pT.

Use this when: You are doing magnetic emissions testing, H-field probe readings, or low-frequency EMC measurements.

Reference only. Verify against your calibrated setup, antenna calibration data, and the applicable standard before making compliance decisions.

Key formula

dBµA/m = 20 × log₁₀(A/m) + 120 · T = A/m × (4π × 10⁻⁷)

Example: Enter 120 dBµA/m → 1 A/m

H-field (log)

dBµA/m

H-field

A/m

B-field (log)

dBpT

B-field

µT

B-field

Magnetic field units in EMC

Low-frequency and magnetic emissions work mix dBµA/m, A/m, tesla, gauss, and picotesla. This converter keeps the relationships in one place so a probe datasheet, an IEC 61000-4-8 level, and a site measurement can be compared.

Remember that B and H are linked by µ in the medium. In air, the conversion is straightforward; inside a core or a shielded room it is not something to invent from this page.

Frequently asked questions

Quick answers about using this calculator

How do I convert A/m to dBµA/m?

dBµA/m = 20 × log₁₀(A/m × 10⁶). 1 A/m is 120 dBµA/m.

When do EMC labs use tesla vs A/m?

Immunity and many EMC probes use A/m or dBµA/m. Tesla and gauss appear more in magnetics and medical or geomagnetic contexts. Convert carefully and keep the medium in mind.

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