dBW to dBm
Type a value in dBW to get it in dBm instantly.
50dBm
That's 501× as strong as a phone transmitting, while a broadcast transmitter is 1,000× stronger. That is about 100,000 milliwatts.
Convert the other way: dBm to dBW
What it means
How strong is that signal?
Voltage figures assume the 50 ohm system impedance of radio equipment. In a 75 ohm cable television system the same power gives a different voltage.
The math
How to convert dBW to dBm
dBm is an absolute level against one milliwatt: mW = 10^(dBm ÷ 10), and dBm = 10 × log₁₀(mW). Add 30 for dBW, and in 50 ohms add 107 for dBµV.
Example: 20 dBW = 50 dBm.
Every unit
Your level in every unit
Tables
dBW to dBm conversion table
| dBW | dBm |
|---|---|
| -100 dBW | -70 dBm |
| -70 dBW | -40 dBm |
| -50 dBW | -20 dBm |
| -30 dBW | 0 dBm |
| -10 dBW | 20 dBm |
| 0 dBW | 30 dBm |
| 10 dBW | 40 dBm |
| 20 dBW | 50 dBm |
| 30 dBW | 60 dBm |
| 40 dBW | 70 dBm |
| 50 dBW | 80 dBm |
dBm to dBW conversion table
| dBm | dBW |
|---|---|
| -100 dBm | -130 dBW |
| -70 dBm | -100 dBW |
| -50 dBm | -80 dBW |
| -30 dBm | -60 dBW |
| -10 dBm | -40 dBW |
| 0 dBm | -30 dBW |
| 10 dBm | -20 dBW |
| 20 dBm | -10 dBW |
| 30 dBm | 0 dBW |
| 40 dBm | 10 dBW |
| 50 dBm | 20 dBW |
Quick answers
Quick answers
- How many dBm is 1 dBW?
- 1 dBW is 31 dBm.
- How many dBm is 10 dBW?
- 10 dBW is 40 dBm.
- How many dBm is 20 dBW?
- 20 dBW is 50 dBm.
The units
About these units
dBW (dBW)
Decibels relative to one watt, used for transmitters. 0 dBW is 30 dBm.
dBm (dBm)
Decibels relative to one milliwatt, the standard radio power level.
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