dBm = log10 (mW)*10
mW =10^(dBm/10)
| 40 dBm | 10.00 watts | |
| 36 dBm | 4.00 watts | { Maximum ERP allowed by FCC in U.S. |
| 30 dBm | 1.00 watts | |
| 27 dBm | 500 milliwatts | |
| 26 dBm | 400 milliwatts | |
| 25 dBm | 320 milliwatts | |
| 24 dBm | 250 milliwatts | |
| 23 dBm | 200 milliwatts | { Typical output from WLAN devices at 915MHz |
| 22 dBm | 160 milliwatts | |
| 21 dBm | 130 milliwatts | |
| 20 dBm | 100 milliwatts | { Maximum ERP allowed by E.T.S.I. In Europe |
| 15 dBm | 32 milliwatts | |
| 10 dBm | 10 milliwatts | |
| 5 dBm | 3.2 milliwatts | |
| 4 dBm | 2.5 milliwatts | |
| 3 dBm | 2.0 milliwatts | |
| 2 dBm | 1.6 milliwatts | |
| 1 dBm | 1.3 milliwatts | |
| 0 dBm | 1.0 milliwatts | |
| 1- dBm | 0.79 milliwatts | |
| 5- dBm | 0.32 milliwatts | |
| 10- dBm | 0.1 milliwatts | |
| 20- dBm | 0.01 milliwatts | |
| 30- dBm | 0.001 milliwatts | |
| 40- dBm | 0.0001 milliwatts | |
| 50- dBm | 0.00001 milliwatts | |
| 60- dBm | 0.000001 milliwatts | |
| 70- dBm | 0.0000001 milliwatts | |
| 80- dBm | 0.00000001 milliwatts | {Receive threshold for WLAN devices |
