Enter the radiated power and the input power into the calculator to determine the Antenna Efficiency.

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## Antenna Efficiency Formula

The following formula is used to calculate the Antenna Efficiency.

**Ea = Pr / Pi * 100**

- Where Ea is the Antenna Efficiency (%)
- Pr is the radiated power
- Pi is the input power

## How to Calculate Antenna Efficiency?

The following two example problems outline how to calculate the Antenna Efficiency.

**Example Problem #1:**

- First, determine the radiated power. In this example, the radiated power is given as 150.
- Next, determine the input power. For this problem, the input power is given as 200.
- Finally, calculate the Antenna Efficiency using the equation above:

Ea = Pr / Pi * 100

Inserting the values from above and solving the equation:

Ea = 150 / 200 * 100 = 75 (%)

**Example Problem #2: **

Using the same process as above, first define the variables required by the formula. In this case, these values are:

radiated power = 300

input power = 1000

Entering these values yields:

Ea = 300 /1000 * 100 = 30 (%)