All about the Blogger 'Monetize' tab

The Monetize tab in Blogger makes it easy to enable AdSense ads on your blog. Once enabled, Blogger will retrieve your AdSense earnings data directly from AdSense so you do not need to go to AdSense to get basic earnings information.

AdSense Reports

Once you start generating AdSense impressions, you will begin earning money when people click on ads that show on your site.
The earnings report (visible when you click on the Monetize link from your Dashboard, or the Monetize tab when viewing your blog while logged into Blogger) includes a drop-down bar with Today, Yesterday, Last 7 Days, This Month, Last Month, and All time.
Selecting an option will retrieve the relevant report directly from AdSense.

All time

If you are already an AdSense user, you will notice that Blogger created a new channel (with the URL of your blog) in your account. If you have had AdSense ads on your blog before using Blogger’s AdSense integration to insert ads into your blog, it is important to note that All time will retrieve data only from the time you connected Blogger to your AdSense account.
This in no way affects your overall AdSense reporting, available directly from AdSense.

Terminology

The AdSense report visible from the Monetize tab contains basic information about how many ads have run on your blog, how many clicks were generated, and how much revenue you have earned. Each term in the report is defined below:

Page impression: A page impression is generated every time a user views a page displaying Google ads. We will count one page impression regardless of the number of ads displayed on that page. For example, if you have a page displaying three ad units and it is viewed twice, you will generate two page impressions and six ad unit impressions.

Clicks:# The number of times an ad was clicked on in the given reporting period.

Page CTR (Clickthrough Rate): The number of ad clicks divided by the number of impressions for the page of ads that appears when a link unit is clicked.

Page eCPM (Effective Cost Per Thousand Impressions): Calculated by dividing earnings by number of page impressions and multiplying. This makes it easier to compare multiple sites to see which are performing better.

Earnings: Total revenue earned to date. More detail about earnings is available in the AdSense Help Center.

Google Support