dBm to dBµV Converter

Convert between dBm and dBµV at any system impedance (50 Ω, 75 Ω, or custom).

Use this when: You have a spectrum analyzer or LISN reading in dBm or dBµV.

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

Frequently asked questions

Quick answers about using this calculator

How do I convert dBm to dBµV?

dBµV = dBm + 10·log₁₀(Z) + 90, where Z is system impedance in ohms. At 50 Ω the offset is 107 dB.

Why does impedance matter for dBm to dBµV?

dBm is power relative to 1 mW; dBµV is voltage. The conversion depends on the load impedance (typically 50 Ω for RF, 75 Ω for video, or 600 Ω for audio).

What impedance should I use?

Match your measurement setup: 50 Ω for most spectrum analyzers and LISNs, 75 Ω for cable TV paths, or enter a custom value from your instrument settings.

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