Milliwatts to dBm
Type a value in mW to get it in dBm instantly.
13.01dBm
That's 2,000,000× as strong as a good Wi-Fi signal, while a Wi-Fi router is 5× stronger. That is about 20 milliwatts.
Convert the other way: dBm to mW
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 mW 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 mW = 13.0103 dBm.
Every unit
Your level in every unit
Tables
mW to dBm conversion table
| mW | dBm |
|---|---|
| 1×10⁻¹⁰ mW | -100 dBm |
| 1×10⁻⁷ mW | -70 dBm |
| 1×10⁻⁵ mW | -50 dBm |
| 0.001 mW | -30 dBm |
| 0.1 mW | -10 dBm |
| 1 mW | 0 dBm |
| 10 mW | 10 dBm |
| 100 mW | 20 dBm |
| 1,000 mW | 30 dBm |
| 10,000 mW | 40 dBm |
| 100,000 mW | 50 dBm |
dBm to mW conversion table
| dBm | mW |
|---|---|
| -100 dBm | 1×10⁻¹⁰ mW |
| -70 dBm | 1×10⁻⁷ mW |
| -50 dBm | 1×10⁻⁵ mW |
| -30 dBm | 0.001 mW |
| -10 dBm | 0.1 mW |
| 0 dBm | 1 mW |
| 10 dBm | 10 mW |
| 20 dBm | 100 mW |
| 30 dBm | 1,000 mW |
| 40 dBm | 10,000 mW |
| 50 dBm | 100,000 mW |
Quick answers
Quick answers
- How many dBm is 1 mW?
- 1 mW is 0 dBm.
- How many dBm is 10 mW?
- 10 mW is 10 dBm.
- How many dBm is 20 mW?
- 20 mW is 13.0103 dBm.
The units
About these units
Milliwatts (mW)
The linear power. One milliwatt is 0 dBm exactly.
dBm (dBm)
Decibels relative to one milliwatt, the standard radio power level.
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