Many users of Adbrite and other similar advertising programs may have wondered what eCPM means, or how it is calculated? If you encountered a question: 'What's the price to beat?', when installing Adbrite, and stood still without knowing what to write in, here's an answer.
Effective cost-per-thousand impressions (eCPM) is a useful way to compare revenue across different channels and advertising programs. Essentially, effective CPM represents your estimated earnings for every 1000 impressions you receive.
Effective CPM doesn't represent how much you have actually earned -- rather, it's calculated by dividing your estimated earnings by the number of page impressions, then multiplying by 1000. For example, if you earned an estimated $0.15 from 25 page impressions, then your page eCPM would equal ($0.15 / 25) * 1000, or $6.00. If you earned an estimated $180 from 45,000 ad impressions, your ad eCPM would equal ($180 / 45,000) * 1000, or $4.00.
From Google Adsense Help
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