Watts & dBm converter
Convert RF power in either direction.
Converted power--
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Watts to dBm and dBm to Watts Converter
Convert radio-frequency power between watts, milliwatts and dBm.
About this calculator
How to use it
Choose either watts-to-dBm or dBm-to-watts and enter the known value for an instant conversion.
Understanding the result
dBm is an absolute power level referenced to one milliwatt. It is different from dB, which describes a relative gain or loss.
More ham radio calculators
Use this calculator as a practical starting point. Check critical radio, electrical and installation work with suitable test equipment and current licence requirements.