For example, you may agree on $1.5 CPC and this is how much you'll pay for every single click. CPM calculator helps you with cost and volume of advertising traffic. CPM calculator helps compute a basic task for online marketers and publishers. CPM is shorthand for cost per mile or cost per thousand and is a common measure of volume in advertising. CPC is cost per click CPM formula is CPM = 1000 * cost / impressions CPC = total_cost / number_of_clicks.