How to calculate ad cost on your website for direct advertisers – ad price calculation :
Step 1 : You go on simmilary websites and try to find CPM for your topic. You can try to see Google Adwords keyword CPM rate too using google adwords network.
Step 2 : Check your website stats – page views and impressions.
Step 3 : Calculate : Ad Cost = Impressions / (CPM * 1000)