Enter the power transmitted to the load before and after insertion into the calculator to determine the insertion loss (dB).

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## Insertion Loss Formula

The following formula is used to calculate the insertion loss of a transmission line.

IL = 10*log_{10}( Pt/Pr)

- Where IL is the insertion loss (dB)
- Pt is the power before insertion
- Pr is teh power after insertion

Alternatively, insertion loss can also be explored with electronic filters using the following formula:

IL = 20*log_{10}(V1/V2)

- Where V1 is the signal without a filter installed
- V2 is the signal with a filter installed

The calculator will evaluate both values.

## Insertion Loss Definition

Insertion loss is most commonly defined as the loss of signal power resulting from the insertion of a device in a transmission line.

## Example Problem

**How to calculate insertion loss? **

First, determine the power transmitted before insertion of the device. For this example problem, the power before insertion is found to be 10 W.

Next, determine the power transmitted after a device is inserted in the transmission line. In this case, the power after is found to be 5 W.

Finally, calculate the insertional loss using the formula above:

= 10*log_{10}( Pt/Pr)

= 10*log_{10}( 10/5)

= 3.0102 dB