# Click through rate

Click through rate (CTR) is a measurement used in online Advertising. Email campaigns and Search Results. Click through rate is given as a percentage. If an advertisement has a click through rate of 5%, this means out of 100 people who saw the advertisement, 5 people clicked the link and reached the target website.[1]

## Email Campaigns

An email campaign is sending out emails to a large number of recipients at a time to promote a product or service. CTR in email campaigns is the number of people who clicked the link in the email and landed on the sender's website.[4] In 2020 the average CTR for email campaigns is 2.62.[5]

## Search Engine Rankings

CTR is an important factor in Search Engines like Google. For a search term, Google will display 10 results. If the number of users clicking on the 2nd result is more than the number clicking on the 1st result, with time the 2nd result will move up because of it's high CTR. Similarly CTR affects the ranking of video sharing sites like YouTube.[6] CTR can be calculated by dividing the number of clicks (e.g. on a specific post) by reach. Then multiply by 100. This is represented by the following formula:

${\displaystyle CTR=100*{Clicks(Number) \over Reach}}$ [7]

## References

1. "American Marketing Association". Wikipedia. 2020-08-02.
2. Wasserman, Todd (9 August 2013). "This Is the World's First Banner Ad". Mashable. Retrieved 2020-09-28.