How to Find the Return on Ad Spend?
The free Return on Ad Spend Calculator from SEO Book can help you determine how much you can spend on CPM (cost per thousand impressions) advertising profitably. To see your ROI, or return on investment, enter your total monthly impressions, estimated average CPM, click-through rate, conversion rate, and average profit per conversion. It will return a display that gives you your montly advertising cost, the total number of conversion from the CPM traffic, the projected profit less the advertising expense, and your ROI percentage.
This is a helpful tool to make it easier to keep track of expenses and project profits. It also helps you determine how much you can pay for your CPM ad campaigns and remain profitable.