ePCM, CTR, Earnings

HOw do these work?

[PowerUp]

Hi, I still don't understand how the eCPM, CTR and Earnings work.

If i use CTR X eCPM it is not equal to earnings.

[GoldenHammer]

Earnings = eCPM x Impressions.

[hunderdown]

eCPM is a measure of how much you are earning per 1000 impressions. It's a derived statistic.

Number of click x average cost per click = earnings.

[AdSenseAdvisor]

Check the AdSense glossary at [google.com...]

Also, for a description of eCPM and how it is useful for you, check out:

[adsense.blogspot.com...]

Hope that helps,

ASA

[Juan_G]

Also, as a summary:

CTR = (Clicks / Impr) * 100
eCPM = (Earnings / Impr) * 1000
EPC = Earnings / Clicks

And:

Earnings = eCPM * Impr / 1000
Earnings = CTR * EPC * Impr / 100
eCPM = CTR * EPC * 10

[21_blue]

It's a derived statistic.
Number of click x average cost per click = earnings.

Actually, the "average cost per click" is also a derived statistic.

Earnings = sum(click values)

That is, earnings is the sum of the (usually different) values for every click you receive.

Eg: suppose you have 50 impressions and receive 3 clicks in the day with the following values (to you):
* Click-1 earns you $20
* Click-2 earns you $5
* Click-3 earns you 37c

Although click values are not reported by Adsense, all the stats are derived from these numbers, such as:

• Your "earnings" is $25.37 (the sum of the click values)
  
• Your "average earnings per click" (not listed in Adsense reports) is $8.46 (the sum of the click values divided by the number of clicks)
  
• Your "CTR" is 6% (the number of clicks divided by the number of impressions, multiplied by 100)
  
• Your "eCPM" is $507.40 (earnings divided by the number of impressions, multiplied by 1,000).
  

The reason for the multiplication by 100 is that "percentage" means "per hundred".

The reason for the multiplication by 1000 is that the "PM" in "eCPM" means "per thousand" (using the latin designation for thousand: M)

[Sleights]

EPC and CPC are two different entities - they are not interchangeable.