dBm to watts
Type a value in dBm to get it in W instantly.
0.1W
That's about the same as a Wi-Fi router. That is about 100 milliwatts.
Convert the other way: W to dBm
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 dBm to W
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 dBm = 0.1 W.
Every unit
Your level in every unit
Tables
dBm to W conversion table
| dBm | W |
|---|---|
| -100 dBm | 1×10⁻¹³ W |
| -70 dBm | 1×10⁻¹⁰ W |
| -50 dBm | 1×10⁻⁸ W |
| -30 dBm | 1×10⁻⁶ W |
| -10 dBm | 0.0001 W |
| 0 dBm | 0.001 W |
| 10 dBm | 0.01 W |
| 20 dBm | 0.1 W |
| 30 dBm | 1 W |
| 40 dBm | 10 W |
| 50 dBm | 100 W |
W to dBm conversion table
| W | dBm |
|---|---|
| 1×10⁻¹³ W | -100 dBm |
| 1×10⁻¹⁰ W | -70 dBm |
| 1×10⁻⁸ W | -50 dBm |
| 1×10⁻⁶ W | -30 dBm |
| 0.0001 W | -10 dBm |
| 0.001 W | 0 dBm |
| 0.01 W | 10 dBm |
| 0.1 W | 20 dBm |
| 1 W | 30 dBm |
| 10 W | 40 dBm |
| 100 W | 50 dBm |
Quick answers
Quick answers
- How many W is 1 dBm?
- 1 dBm is 0.00125893 W.
- How many W is 10 dBm?
- 10 dBm is 0.01 W.
- How many W is 20 dBm?
- 20 dBm is 0.1 W.
The units
About these units
dBm (dBm)
Decibels relative to one milliwatt, the standard radio power level.
Watts (W)
For transmitters and amplifiers.
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