Performance Marketing
What is Impression Share?
Impression Share is the percentage of available impressions an ad actually received out of all the impressions it was eligible to show for, revealing how much reach is being left on the table due to budget or competitiveness limits.
Who Is It For?
Impression share is monitored by paid media managers deciding whether to increase budget or improve ad quality to capture more available reach.
How Is It Used?
It’s used to diagnose whether a campaign is losing reach to budget constraints or to being outranked by competitors, which call for different fixes.
- Check whether lost impression share is due to budget or ad rank
- Increase budget when budget-constrained impression share loss is limiting a strong-performing campaign
- Improve ad relevance and quality score when rank-constrained losses are the issue
- Track impression share trends alongside conversion metrics, not in isolation
Related Terms & Concepts
Frequently Asked Questions
What’s a good impression share?
It depends on strategy and budget — a lower impression share isn’t automatically bad if it reflects deliberate targeting, but consistently losing share to budget on high-performing campaigns is worth addressing.
Why would impression share suddenly drop?
Common causes include a reduced daily budget, increased competition bidding up the same keywords or audience, or a drop in ad relevance and quality score.
