Enter the input power (watts) and the antenna gain into the calculator to determine the Effective Radiated Power. 

Effective Radiated Power Formula

The following formula is used to calculate the Effective Radiated Power. 

ERP = IP * G

  • Where ERP is the Effective Radiated Power (watts)
  • IP is the input power (watts) 
  • G is the antenna gain 

How to Calculate Effective Radiated Power?

The following two example problems outline how to calculate the Effective Radiated Power.

Example Problem #1:

  1. First, determine the input power (watts). In this example, the input power (watts) is measured to be 13.
  2. Next, determine the antenna gain. For this problem, the antenna gain is calculated to be 2.5.
  3. Finally, calculate the Effective Radiated Power using the formula above: 

ERP = IP * G

Inserting the values from above and solving the equation with the imputed values gives: 

ERP = 13 * 2.5 = 32.5 (watts)


Example Problem #2: 

Using the same process as example problem 1, we first define the variables outlined by the formula. In this case, the values are:

input power (watts) = 500

antenna gain = 3.5

Entering these values into the formula or calculator above gives us:: 

ERP = 500 * 3.5 = 1750 (watts)