Watts to dBm conversion

Watts to dBm conversion calculator

Watts (W) to decibel-milliwatts (dBm), power conversion calculator.

Enter the power in watts and press the Convert button:

         
  Enter watts: W  
         
       
         
  dBm result: dBm  
         

dBm to watts conversion calculator ►

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(100020W) = 43.0103dBm

Watt to dBm conversion table

Power (mW) Power (dBm)
0 W not defined
0+ W -∞ dBm
0.00001 W -20.0000 dBm
0.0001 W -10.0000 dBm
0.001 W 0.0000 dBm
0.01 W 10.0000 dBm
0.1 W 20.0000 dBm
1 W 30.0000 dBm
10 W 40.0000 dBm
 100 W 50.0000 dBm
 1000 W 60.0000 dBm
 10000 W 70.0000 dBm
100000 W 80.0000 dBm
1000000 W 90.0000 dBm

 

dBm to watts conversion ►

 


See also

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