20 dBm to Watts
20 dBm equals exactly 100 milliwatts (0.1 W).
How to use this tool
- Enter power level in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your power and the full breakdown beneath it.
20 dBm (100 mW) is a typical maximum output power for Wi-Fi access points and cordless phone base stations.
Frequently asked questions
- What is a typical Wi-Fi signal strength in dBm?
- -30 dBm is excellent (very close to the access point). -70 dBm is usable. Below -80 dBm connections become unreliable.
- What is the difference between dBm and dBW?
- Both are logarithmic power units. dBm references 1 mW; dBW references 1 W. dBW = dBm − 30. A 1 W transmitter is 30 dBm or 0 dBW.