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

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## 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:**

- First, determine the input power (watts). In this example, the input power (watts) is measured to be 13.
- Next, determine the antenna gain. For this problem, the antenna gain is calculated to be 2.5.
- 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)