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Power Supply Efficiency Calculator

Formula

To calculate the Power Supply Efficiency (Eps):

$Eps = \left( \frac{OP}{IP} \right) \times 100$

Where:

$Eps$ is the Power Supply Efficiency in percentage
$OP$ is the Unit Output Power in watts
$IP$ is the Supply Input Power in watts

What is Power Supply Efficiency?

Power supply efficiency refers to the ratio of the output power to the input power of a power supply unit, expressed as a percentage. It indicates how effectively the power supply converts the input electrical power into usable output power. Higher efficiency means less energy is wasted as heat, resulting in better performance and lower energy costs.

Example Calculation 1

Let's assume the following values:

Supply Input Power ( $IP$ ) = 150 watts
Unit Output Power ( $OP$ ) = 120 watts

Using the formula:

$Eps = \left( \frac{120}{150} \right) \times 100 = 80 \%$

The Power Supply Efficiency is 80%.

Example Calculation 2

Let's assume the following values:

Supply Input Power ( $IP$ ) = 200 watts
Unit Output Power ( $OP$ ) = 180 watts

Using the formula:

$Eps = \left( \frac{180}{200} \right) \times 100 = 90 \%$

The Power Supply Efficiency is 90%.