What is CPI?

What is CPI?
CPI, short for Cost-Per-Install, is an online advertising model to drive traffic to a website in which an advertiser pays a publisher only when the ad is clicked by a real user and the user completed software or app installs, calculated by dividing the total cost of the advertising campaign by the number of completed installations.

CPI, or cost per install, is a performance marketing advertising model in which marketers pay media sources a pre-defined amount based on every software or app install.

How do I Calculate CPI?
CPI is calculated by taking the total cost of a specific advertising campaign dividing by the number of installs generated from this campaign. For example, an ad campaign that generated 100 installs and total cost was $350:

$350 divided by 100 installs = $3.5 CPI (Cost-Per-Install)