dBm to watt converter
Convert radio power between dBm, dBW, watts and milliwatts, and a dB gain into a power ratio. It runs in your browser: nothing you type is sent anywhere.
- dBm
- 27
- dBW
- -3
- Watts
- 0.5012 W
- Milliwatts
- 501.2 mW
P(mW) = 10^(dBm / 10) and dBm = 10 log10(mW). dBW is dBm minus 30.
- Gain
- 23 dB
- Power ratio
- 199.5 ×
Every 3 dB doubles the power and every 10 dB multiplies it by ten. A loss is a negative gain.
Common values
The powers a WISP meets most, from a weak received signal to a strong transmitter.
| dBm | dBW | Milliwatts | Watts |
|---|---|---|---|
| -90 dBm | -120 dBW | 1 × 10⁻⁹ mW | 1 × 10⁻¹² W |
| -60 dBm | -90 dBW | 1 × 10⁻⁶ mW | 1 × 10⁻⁹ W |
| -30 dBm | -60 dBW | 0.001 mW | 1 × 10⁻⁶ W |
| -10 dBm | -40 dBW | 0.1 mW | 1 × 10⁻⁴ W |
| 0 dBm | -30 dBW | 1 mW | 0.001 W |
| 10 dBm | -20 dBW | 10 mW | 0.01 W |
| 20 dBm | -10 dBW | 100 mW | 0.1 W |
| 27 dBm | -3 dBW | 501.2 mW | 0.5012 W |
| 30 dBm | 0 dBW | 1,000 mW | 1 W |
| 40 dBm | 10 dBW | 10,000 mW | 10 W |