How to determine the ideal number of ads a site should have?

[King Belieal]

Ads are useful to help a site get monetized. Some people use ad networks singly or in combination to boost the revenue that the site would have.

What are the factors that determine the ideal number of ads that should be placed on a site's page? How can a site owner determine the ideal number of ads for his or her site?

 

[Nomad]

NO matter the kind of website you are running, you should never use more than 5 ad units per page. This is standard practice