How to caculate Adwords cost by myself?

[Yangtze]

I am not sure how Google caculate the cost.

For example, I have an ad group, bid is $1.20USD per click, recived 13 clicks, impression 1142, click rate 1.13%. Then it shows "average cost per click" $0.72. (avarage ranking 3.5)

Could anyone here let me know how it comes to $0.72?

[LifeinAsia]

Google takes the total cost for all the clicks and divides by the number of clicks to get the average cost per click. Simple math.

[bostonseo]

Yes you'll never see an actual breakdown of the clicks - always just an average.

[AdWordsAdvisor]

Google takes the total cost for all the clicks and divides by the number of clicks to get the average cost per click. Simple math.

Yes you'll never see an actual breakdown of the clicks - always just an average.

Quite correct. And just to add a bit more detail, each click is quite likely to cost a different amount - which is dependent on the competitive landscape at the moment the search takes place.

The actual cost per click will always be less than (or equal to) the Maximum CPC set by the advertiser for the Ad Group (or per individual keyword if the advertiser has set things up that way).

AWA

[bostonseo]

Man it would be sweet to see the actual click charges....just once. What other product/service do you buy where you never actually get the actual (not average) price?

[AdWordsAdvisor]

Price per grape or green bean? :)

AWA

[bostonseo]

Not if I buy 1 grape 3 separate times on the same day AWA. Nice try though.

[Yangtze]

Does the "cost per click" have anything to do with "click through rate"?

[bostonseo]

"Does the "cost per click" have anything to do with "click through rate"? "

Yes with a caveat. CPC price used to be much more in line with actual click thru rates. Once Google added the quality score factor of the CPC algorithm, click thru rate has become (in the majority of the cases) less of factor in the how the price is determined.