You can do this with a Funnels report:
- 3.
In the funnel settings, make sure the conversion window is set to whatever “before” means for you (e.g. within 30 days).
- 4.
Look at the conversion rate from A → B and the user counts.
To answer your exact question “what share of users that performed B had done A before?”:
Note the number of users who converted from A to B in the funnel (users who did A, then B).
Then, in an Insights report (or Users page), get the total number of users who did B in the same time range.
Compute:
share = (users who did A then B) / (users who did B).
The docs don’t show a single built‑in metric that directly gives “% of B‑users who previously did A” in one click; you have to combine funnel output with the total B‑user count as above. The knowledge sources do not explicitly describe this exact ratio as a pre‑built feature.
