Enter the change in dB and the change in power (watts) into the Calculator. The calculator will evaluate the Db Per Watt. 

Db Per Watt Formula

dBW = dB/P


  • dBW is the Db Per Watt (dB/watts)
  • dB is the change in dB
  • P is the change in power (watts)

To calculate Db Per Watt, divide the change in decibels by the change in power.

How to Calculate Db Per Watt?

The following steps outline how to calculate the Db Per Watt.

  1. First, determine the change in dB. 
  2. Next, determine the change in power (watts). 
  3. Next, gather the formula from above = dBW = dB/P.
  4. Finally, calculate the Db Per Watt.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

change in dB = 90

change in power (watts) = 10