# Watts to dBm conversion Effortlessly convert watts (W) to decibel-milliwatts (dBm) with our convenient Watts to dBm Conversion tool. Whether for telecommunications, signal strength calculations, or RF engineering, our converter provides accurate and quick results. Simply input the value in watts, and our tool will provide you with the equivalent power in dBm

 Enter watts: W dBm result: dBm

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## What is Watts to dBm conversion

The conversion from watts (W) to decibel-milliwatts (dBm) requires the use of a logarithmic formula. The formula is as follows:

dBm = 10 * log10(P / 1mW)

Where P is the power in watts.

For example, let's convert 2 watts to dBm:

dBm = 10 * log10(2 / 1mW) dBm = 10 * log10(2000) dBm = 10 * 3.301 dBm = 33.01 dBm

Therefore, 2 watts is approximately equal to 33.01 dBm.

## 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

## Watt to dBm conversion table

Power (W) Power (dBm)
0 W not defined
0+ W -∞ dBm
0.00001 W -20 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
1000 W 60 dBm
10000 W 70 dBm
100000 W 80 dBm
1000000 W 90 dBm