Enter the linear regulator input (watts) and the linear regulator output (watts) into the calculator to determine the Linear Regulator Efficiency.

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## Linear Regulator Efficiency Formula

The following formula is used to calculate the Linear Regulator Efficiency.

Elr = RO/ RI *100

- Where Elr is the Linear Regulator Efficiency (%)
- RI is the linear regulator input (watts)
- RO is the linear regulator output (watts)

To calculate the linear regulator efficiency, divide the regulator output by the regulator input, then multiply by 100.

## How to Calculate Linear Regulator Efficiency?

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

**Example Problem #1:**

- First, determine the linear regulator input (watts). In this example, the linear regulator input (watts) is given as 30.
- Next, determine the linear regulator output (watts). For this problem, the linear regulator output (watts) is given as 25.
- Finally, calculate the Linear Regulator Efficiency using the equation above:

Elr = RO/ RI *100

Inserting the values from above and solving the equation:

Elr = 25/ 30 *100 = 83.334 (%)

**Example Problem #2: **

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

linear regulator input (watts) = 600

linear regulator output (watts) = 100

Entering these values yields:

Elr = RO/ RI *100 = 16.66 (%)