pjhtech Tools
Link & transport

dBm / mW Converter

Convert logarithmic power in dBm to milliwatts and back.

Input

Reset restores the example inputs.

Local calculation · inputs are not sent to a server.

Result

Calculating the example…

Choose the direction and enter the power in the selected unit. Copy the result when an optical or radio specification uses the other unit.

Example: −10 dBm is 0.1 mW; 0 dBm is 1 mW; 10 dBm is 10 mW. A 3 dB change is close to, but not exactly, a factor of two.

Negative dBm is valid; zero or negative mW is rejected. dB without the m describes a ratio, not an absolute power. Small results may use scientific notation.

References