Enter the supply input power (watts) and the unit output power (watts) into the calculator to determine the Power Supply Efficiency.

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## Power Supply Efficiency Formula

The following formula is used to calculate the Power Supply Efficiency.

**Eps = OP / IP * 100**

- Where Eps is the Power Supply Efficiency (%)
- OP is the supply input power (watts)
- IP is the unit output power (watts)

## How to Calculate Power Supply Efficiency?

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

**Example Problem #1:**

- First, determine the supply input power (watts). In this example, the supply input power (watts) is given as 60.
- Next, determine the unit output power (watts). For this problem, the unit output power (watts) is given as 100.
- Finally, calculate the Power Supply Efficiency using the equation above:

Eps = OP / IP * 100

Inserting the values from above and solving the equation:

Eps = 60 / 100 * 100 = 60 (%)

**Example Problem #2: **

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

supply input power (watts) = 50

unit output power (watts) = 200

Entering these values yields:

Eps = 50 / 200 * 100 = 25 (%)