What is the corresponding value in decibels?

(cisco RF Power Values – Document ID: 23231)
If 0 dB = 1 mW, then 14 dB = 25 mW.

To convert milliwatts to dBm, try to determine if the value to convert can be divided by ten to
get an integer as close to 1 as possible.
Each time you can divide it by ten, add 10 dBm. Then, try to divide the remaining value by 2. Each time you can divide it by 2, add 3 dBm.

For example, consider 40 mW. It can be divided by 10, giving 4. It contains 10 dBm. Four cannot be divided by ten anymore and give an integer, but it can be divided by 2, giving 2, and again, giving 1.
As you do it twice, two times 3 dBm are present in this number. The total gives
10+3+3 = 16 dBm.

25mW / 10 (+10db)= (10dB)
2.5 /2 (+3dB)
=1