Enter the amplifier output power and the amplifier input power into the calculator to determine the Amplifier Efficiency.

- All Efficiency Calculators
- Spectral Efficiency Calculator
- Log Amplifier Voltage Calculator
- Speaker Efficiency Calculator

## Amplifier Efficiency Formula

The following formula is used to calculate the Amplifier Efficiency.

Eamp = O / I *100

- Where Eamp is the Amplifier Efficiency (%)
- O is the amplifier output power
- I is the amplifier input power

To calculate the amplifier efficiency, divide the amplifier output power by the input power, then multiply by 100.

## How to Calculate Amplifier Efficiency?

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

**Example Problem #1:**

- First, determine the amplifier output power. In this example, the amplifier output power is given as 15.
- Next, determine the amplifier input power. For this problem, the amplifier input power is given as 283.
- Finally, calculate the Amplifier Efficiency using the equation above:

Eamp = O / I *100

Inserting the values from above and solving the equation:

Eamp = 15 / 283 *100 = 5.3 (%)

**Example Problem #2: **

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

amplifier output power = 110

amplifier input power = 500

Entering these values yields:

Eamp =110 / 500 *100 = 22 (%)