Compare and track your ads' performance over time

Curious whether your ad is clicked more often on Fridays than Sundays? Want to easily compare ad group impressions by quarter? Google Ads provides multiple ways to compare performance over time. This article will show you how to compare performance across 2 date ranges. You’ll also learn how to use segments to drill down to specific data sets.

Budgets (Account Optimization)

See more videos on how to improve your account performance.

Compare data from two time periods

Let's say you want to know how your campaigns did last week compared with the week before. Or maybe you want to see data for the current month compared with this month last year. You can see all this by using the "Compare" option in the date range selector.


  1. Click the down arrow next to the date range in the upper right corner of your screen.
  2. Click the toggle next to "Compare"  from the dropdown.
  3. Choose whether you’d like to compare the Previous period (default), the Previous year, or a Custom date range. 
  4. If you select Custom, you can select the dates you’d like to measure above the calendar.
  5. Click Apply. You’ll see results for both date ranges in your performance chart.

You’ll now see the percent change in performance on the data tables of your campaigns, ad groups, and ads & extensions pages/e. To see the complete comparison metrics, you’ll need to click on the double arrows (< >) that have now appeared in each of your column headers. Doing so will expand a column to show 4 columns: the current date range, the previous date range, the numerical change between the 2 date ranges, and the percentage change.

Once you choose a date range, both alone and as part of a comparison, those dates apply across your account (until you change them).

View explanations for the changes

When you turn on “Compare”, you’ll be able to see the explanations behind some of the changes in your performance. Click on the change percent or View explanations to open up the “Explanations” panel where you can find information on what might have caused this change. 

To see explanations, make sure the two time periods you selected are within the past 90 days, of equal length, and are contiguous. Learn more about explanations

Segment your data by time

Segments can provide a more granular view of your data. For example, say you used the date range selector to look at overall performance for the last week, then decided you wanted to see that week broken out by day.

  1. Click the segment icon Segment above your statistics table
  2. Select Time from the drop-down. A sub-menu will appear containing the following options

    1. Day of the week (e.g., Monday, Tuesday, Wednesday)
    2. Day (e.g., Wed., December 21, 2011)
    3. Week
    4. Month
    5. Quarter
    6. Year
    7. Hour of day

This will result in a split of your statistics table into rows based on the date range you select. For example, when you create a "Day of the week" segment, your single row of data will become eight rows of data: the original row plus one new row for every day of the week.

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