dBm to mW / Watts Converter
Convert signal power between dBm, milliwatts and watts — the standard units for Wi-Fi, radio, SFP transceivers and audio levels.
| dBm | 20 | |
| mW | 100 | |
| W | 0.1 |
Reference
| 0 dBm | = | 1 mW |
| 10 dBm | = | 10 mW |
| 20 dBm | = | 100 mW |
| 30 dBm | = | 1 W |
Frequently asked questions
What is dBm?
Decibel-milliwatts: power relative to 1 mW on a logarithmic scale. 0 dBm = 1 mW, 30 dBm = 1 W, -90 dBm is a typical weak Wi-Fi signal.
How do I convert dBm to mW?
P(mW) = 10^(dBm/10). For example, 20 dBm = 100 mW. The converter does this instantly in both directions.
Why use a logarithmic scale?
Signal powers span many orders of magnitude — from femtowatts to watts. Logarithmic dBm makes them compact and easy to compare.