Decibel Watt or dBW is a measure of the strength of the signal in dB relative to 1 Watt.
dBm is the signal strength referenced to 1 mW.
Most often in RF products and applications, signal strength is specified in dBm.
This tool can be used to convert from dBm to dBW.
dBW to dBmFormula
dBW = dBm – 30