The purpose of this post is to clarify the terms CPM and CPC and also show how to convert from one model to the other.

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CPC
CPC stands for Cost Per Click.It means how much it will cost to an advertiser if any user clicks on the ad.
Google Adwords is most popular CPC model used all over the world. Generally search and Display advertising and now video advertisement is sold by CPC model.     In this kind of advertising model, you just pay for number of clicks you get on your ads irrespective of the number of impressions it takes to generate those clicks.
For example, if the CPC is $2.00 and your ad is shown 2,000 times but gets no clicks then you pay nothing. If you get 1 clicks on your ad then you pay $2.00 X 1 = 2 $.00.
CPC = Total Cost/Total Clicks
Total Cost = CPC * Total Clicks

CPM
CPM stands for Cost per miles Impressions (number of times the ad is shown) (M is a Roman numeral for 1000). Generally display/video advertising is sold in CPM. So whenever your ad is showing 1000 times on any websites the cost of the ad is 1 CPM.
For example, if a publisher (Website owner) charges $1 CPM, that means your ad will be shown 1000 times for $1. If your budget is say $10,000 then mean your ad will be shown 1,000,000 times ($10,000 *(1000/$1) ).  

  • Total Impressions = (Total Cost or Budget) * (1000/CPM)

If you are trying to find out how much you will pay for a given number of impressions then you can use the following formula:

  • Total Cost = (Total Impressions * CPM)/1000

If you notice in the above calculations, there are no mentions of how many people the ad will be shown to or how many clicks will be generated. CPM advertising is solely based on impressions. In theory, if you don’t set a frequency cap (i.e. the maximum number of times one person will see your ad) then you could end up serving all the impression to one person only. (If you would like to know more about frequency cap then drop me a line and we can talk further).


CPA:Cost per action/acquisition. A payment model in which advertisers pay for every action, such as a sale or registration, completed as a result of a visitor clicking on their advertisement. Note that an “acquisition” is the same as a “conversion.” 

CPL:Cost per lead. A payment model in which advertisers pay for every lead or customer inquiry that resulted from a visitor who clicked on the advertisement. Also known as cost per inquiry (CPI).    

Comparing CPM to CPC and vice versa
The goal of advertising using one model versus the other is really dependent on what you are trying to achieve. If your objective is to generate Brand awareness then you might engage in display advertising which will most likely be sold in CPM model. While search ads on Google or text or display advertising on Google Ad Network are sold in CPC model.
Often you will end up comparing two models to figure out where and how to spend your money effectively. To do direct cost comparison, you will need to convert CPM to CPC or CPC to CPM pricing.


CPM to CPC conversion
Below is a formula that you can use to calculate a CPC equivalent of a CPM model
CPC = ((Total Impression *CPM)/(1000 *Clicks)
Below is a spreadsheet to show you the same calculation. Let’s take an example of a campaign that costs you $10 CPM and generates 50 clicks in 50,000 impressions.

The above $10 CPM campaign is equivalent to a $5 CPC campaign.
CPC to CPM conversion
Below is a formula that you can use to calculate a CPM equivalent of a CPC model
CPM = (CPC*clicks*1000)/Total Impressions
Let’s take an example of a campaign that costs $4 per click and generates 100 clicks, resulting in a total spend of $400. Let’s say it took 50,000 impressions to generate those 100 clicks.

CPC formula


eCPM
The CPM value you get when you convert CPC into CPM is also known as eCPM (effective CPM).Note: eCPM is also shown in Adsense reports, in that case, it is
Total Adsense Revenue /(Impressions/1000)

Online tools to calculate Cost, Impressions, CPM, CPC or CPA of the advertising

CPM & CPC Comparison Calculator

Compare your CPM and CPC campaigns side by side to see where you should be spending your money.   http://www.optizent.com/cpc-cpm-comparison-calculator.asp
Read more: At Analytics by Anil Batra http://webanalysis.blogspot.com

CPCV – Cost Per Completed View Calculator

Cost Per Completed view another way of buying the inventory that agency used now a days for Video Ads, On CPCV Cost is calculated based on number of seconds video is, How many times the videos is completed

Completed View: When 30 seconds video is viewed by user of all 30 seconds, It’s Called as 1 Completed View.

Formula for CPCV is as below

CPCV= Budget Of Campaign/CV
CV(Completed views)=COST/CPCV
If we consider 60% VTR (View Through Rate)
Impressions= CV*100/60
CPM= Cost*1000/Impressions


CPM-CPC-eCPM Calculator

 

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