Watt to dBm conversion table
Watt to dBm conversion table
| Power (mW) | Power (dBm) |
|---|---|
| 0 W | not defined |
| 0+ W | -∞ dBm |
| 0.00001 W | -20.0000 dBm |
| 0.0001 W | -10.0000 dBm |
| 0.001 W | 0.0000 dBm |
| 0.01 W | 10.0000 dBm |
| 0.1 W | 20.0000 dBm |
| 1 W | 30.0000 dBm |
| 10 W | 40.0000 dBm |
| 100 W | 50.0000 dBm |
| 1000 W | 60.0000 dBm |
| 10000 W | 70.0000 dBm |
| 100000 W | 80.0000 dBm |
| 1000000 W | 90.0000 dBm |
Detailed Table Version
- dBm mW
- 0 1.0 mW
- 1 1.3 mW
- 2 1.6 mW
- 3 2.0 mW
- 4 2.5 mW
- 5 3.2 mW
- 6 4.0 mW
- 7 5.0 mW
- 8 6.0 mW
- 9 8.0 mW
- 10 10 mW
- 11 13 mW
- 12 16 mW
- 13 20 mW
- 14 25 mW
- 15 32 mW
- 16 40 mW
- 17 50 mW
- 18 64 mW
- 19 80 mW
- 20 100 mW
- 21 128 mW
- 22 160 mW
- 23 200 mW
- 24 250 mW
- 25 320 mW
- 26 400mW
- 27 500mW
- 28 640mW
- 29 800mW
- 30 1.0W
- 31 1.3W
- 32 1.6W
- 33 2.0W
- 34 2.5W
- 35 3.0W
- 36 4.0W
- 37 5.0W
- 38 6.0W
- 39 8.0W
- 40 10W
- 41 13W
- 42 16W
- 43 20W
- 44 25W
- 45 32W
- 46 40W
- 47 50W
- 48 64W
- 49 80W
- 50 100W
- 60 1000W
How to convert watts to dBm
The power P(dBm) in dBm is equal to 10 times the base 10 logarithm of 1000 times the power P(W) in watts (W) divided by 1 watt (W):
P(dBm) = 10 · log10( 1000 · P(W) / 1W) = 10 · log10( P(W) / 1W) + 30
so
1W = 30dBm
Example
Convert 20 watts to dBm:
P(dBm) = 10 · log10(1000·20W) = 43.0103dBm