Hey Christina:
Taking Marketo's Email Performance report and then doing some work in Excel is going to be the easiest (and relatively unpainful, actually).
Here are some steps:
- Create an Email Performance report in Analytics.
- Go to "Setup" and edit the time frame and emails appropriately (probably "all time" and every email in this case).
- Run the report
- Export to CSV
- There are two ways to get the number you're looking for, and I'd grab both and see how different they are:
Average of averages: =(SUM(I:I))Take the average of "% Opened" column. This is an average of averages, which isn't necessarily a good thing in a pure math sense, but if you want to weight small-number recipients more, it can be directionally helpful to see if you should segment some more or find another proxy.
Total number average: =(SUM(B:B)/SUM(H:H))Take the total "Sent" and divide by total "Opened." This is going to be skewed pretty heavily if you have lots of operational fulfillment emails, so take it with a grain of salt. I usually group emails into like-categories, such as Lead Nurture emails, and then separate things like fulfillment emails.
Best,
Edward Unthank | Founder, Etumos