Watt to dBm (free) Converter

Watt (W) and dBm (decibel-milliwatt) are both units of power, but they are on different scales. Watt is an absolute unit of power, while dBm is a relative unit of power relative to 1 milliwatt (mW).

To convert watts to dBm, you can use the following formula:

dBm = 10 x log10 (P/1mW)

where P is the power in watts.

For example, if you want to convert 1 watt to dBm, you would do:

dBm = 10 x log10 (1/0.001)
= 10 x log10 (1000)
= 10 x 3
= 30 dBm

So 1 watt is equal to 30 dBm.

Similarly, you can use this formula to convert any power in watts to dBm.

Here’s a table with some examples of power values converted from watts to dBm:

As you can see, the dBm values increase as the power values increase, but the rate of increase is not linear – a doubling of power results in an increase of 3 dBm, not 1 dBm.