Return on investment (ROI) is the aim of any customer, for instance if a PPC form of advertisement is used calculating the outcome is quite basic. Revenue – Expenses (The fee charged for the PPC services) However, when it comes to calculating the seo’s return on investment, this is not very easy. A general approach is used by most companies which is basically the results they are getting from seo’s operations. This could be on what output they are receiving on engine ranking which is basically what return anyone hiring an seo specialist would be expecting. The ROI here isn’t particularly shown in numbers but in the output.