CTR (Click-Through Rate) is the ratio of users who clicked an ad to users who saw it — calculated as clicks divided by impressions, expressed as a percentage.
CTR is the diagnostic metric for ad creative and audience fit. Calculated as ad clicks divided by ad impressions, expressed as a percentage. An ad with 200 clicks against 10,000 impressions has 2% CTR. Healthy CTR varies dramatically by platform, placement, and vertical — Meta Feed averages 1-2% for direct response; LinkedIn Sponsored Content averages 0.4-0.6%; Google Search for branded queries can hit 30%+.
CTR is upstream of both CPA and ROAS — higher CTR means more clicks per impression, which means more conversions per dollar of impression spend (assuming the post-click experience is constant). When CTR drops, downstream metrics follow. This makes CTR the first place to look when an account's performance regresses.
Two common CTR-degradation patterns: creative fatigue (the same audience has seen the same ad too many times — frequency cap exceeded) and audience exhaustion (the campaign has saturated its initial high-intent audience and is now reaching lower-intent users). Both show up as CTR declining week-over-week while CPC stays stable or rises.
Single-platform CTR comparisons are misleading without context. Google Search CTR is structurally higher than Meta Feed CTR because Search users have demonstrated intent by typing a query; Feed users are scrolling passively. The right comparison is always within-platform-and-placement, against the same campaign's prior week or against your account's historical baseline.
Gapscout's audit agents include CTR-regression checks per platform: a campaign whose CTR is down >20% week-over-week against its own baseline gets flagged with the recommended action (creative refresh, audience expansion, or pause). Cross-platform reporting surfaces blended CTR alongside per-platform breakdowns.
Creative fatigue is the performance decline that happens when an audience has seen the same ad creative too many times — CTR drops…
ROAS (Return on Ad Spend) is the ratio of revenue generated by an ad campaign to the spend on that campaign — typically expressed …
CPA (Cost Per Acquisition) is the average cost in ad spend required to drive one conversion — typically a purchase, signup, or qua…