dBm / mW / W Power Converter

P038

Convert power bidirectionally between logarithmic dBm, milliwatts, and watts.

Parameters

Assumptions

  • dBm expresses power relative to 1 mW.

Important notes

  • When mW or W is selected as the input unit, the value must be greater than zero. dBm is a power level; dB is a ratio and is not an interchangeable input unit.

Standards and sources

Verified: 2026-09-05