100 Watts to dBm
100 watts equals exactly 50 dBm.
How to use this tool
- Enter power in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your power and the full breakdown beneath it.
100 W (50 dBm) is the standard output power for HF amateur radio transceivers and many FM broadcast transmitters.
Frequently asked questions
- How much power does a phone transmit?
- A typical smartphone transmits at 0–23 dBm (1 mW to 200 mW) depending on the distance to the cell tower and the band used.
- Why use dBm instead of watts?
- dBm compresses a huge range (picowatts to kilowatts) into a manageable scale and makes gain/loss calculations simple additions and subtractions.