# Watt to dBW Conversion Milliwatt to dBm power converter

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### Detailed Explanation

Decibel conversion of electric power units. Watt to dBm (dB-milliwatt) and/or dBW (dB-Watt). On this page you can find the answer to the question: Convert 20 Watt to dBW or 20 Watt to Decibel-milliwatts. Use the Use the Watts to Decibel Converter above to convert any Watt values to dBm or dBW.

## Watt (W), milliwatt (mW) Conversion Table

Power (mW) Power (dBm)
0.01 mW -20.0000 dBm
0.1 mW -10.0000 dBm
1 mW 0.0000 dBm
2 mW 3 dBm
3 mW 4.8 dBm
4 mW 6 dBm
5 mW 7 dBm
6 mW 7.8 dBm
7 mW 8.5 dBm
8 mW 9 dBm
9 mW 9.5 dBm
10 mW 10 dBm
100 mW 20 dBm
1000 mW 30 dBm
10000 mW 40 dBm
100000 mW 50 dBm
1000000 mW 60 dBm
10000000 mW 70 dBm
100000000 mW 80 dBm
1000000000 mW 90 dBm
10000000000 mW 100 dBm

## mW to dBm Conversion

dBm Definition: dBm is the power ratio in decibels (dB) of the measured power referenced to one milliwatt (mW).

The formula bellow can be translated as: "the power P(dBm) in dBm is equal to 10 times the base 10 logarithm of the power P(mW) in milliwatts (mW) divided by 1 milliwatt (mW)":

P(dBm) = 10 · log10(P(mW)/1mW)

So, for P = 1 mW is equal to 0 dBm

### Example:

Convert 100 mW to dBm:

P(dBm) = 10 · log10(100mW / 1mW) = 20 dBm

## W to dBW Conversion

The decibel-watt or dBW isthe power ratio in decibels (dB) of the measured power referenced to one Watt (W).:

P(dBW) = 10 · log10(P(W)/1W)

### Example:

Convert 10 W to dBW:

P(dBW) = 10 · log10(10W / 1W) = 10 dBW