1 Watt to dBm
1 watt equals exactly 30 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.
1 W = 30 dBm is the most important dBm reference point in RF engineering and amateur radio.
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.