Click-through rate (CTR)
Click-through rate is clicks divided by impressions, expressed as a percentage. The catch is what counts as an impression: Google Search Console counts a result appearing in search, while ad platforms count an ad being served or viewed. Because the denominator differs by platform, CTR figures are only comparable within the same system — and a low CTR can mean wrong audience or simply low intent.
What this means
CTR = clicks ÷ impressions × 100. It measures how often something shown to people was clicked. The metric appears across search (organic listings), advertising (display and search ads), and email (links in a message), and the formula is the same — but the inputs are not.
Where platforms differ
An 'impression' is platform-specific. Google Search Console records an impression when a link to your site appears in a search result the user sees. Ad platforms count an impression when an ad is served — and 'viewable impression' standards (per the IAB/MRC) add a pixel-and-time requirement before it counts. Email CTR usually divides clicks by delivered (or opened) messages. Comparing CTR across these is meaningless because the denominators measure different things.
- Search Console: impression = listing appeared in results
- Ads: impression = ad served; viewable impression adds a visibility bar
- Email: clicks ÷ delivered or opened messages
How it appears in analytics and logs
CTR tells you how often exposure turned into a click. A low CTR can mean a poor title, the wrong position, a mismatched query, or low purchase intent — pair it with position and query data before acting.
Diagnostic use case
Compare CTR within one platform's own definition of an impression, and use it to judge how compelling a listing or ad is relative to its exposure.
What WebmasterID can help detect
WebmasterID tracks first-party click events on your own pages, so on-site CTRs (CTAs, internal links) are measured without third-party cookies.
Common mistakes
- Comparing Search Console CTR to an ad platform's CTR.
- Assuming a low CTR is always a quality problem.
- Ignoring how 'impression' is defined in each tool.
Privacy and accuracy notes
CTR is an aggregate ratio of clicks to impressions; it needs no personal identifiers. Reported figures are counts, not profiles.
Related pages
- Impressions and the viewability problem
An impression counts a piece of content being shown — a search result, an ad, a social post. The trap is that 'shown' has no single definition: Search Console counts a listing appearing in results, ad servers count an ad being delivered, and the IAB/MRC viewable-impression standard requires a portion of pixels visible for a minimum time before it counts. Impressions are only comparable within one definition.
- Conversion rate: definition and denominators
Conversion rate is the share of some base that converted. The trap is the denominator: conversions per session, per user, and per unique visitor give different numbers and mean different things. Without stating the base, a conversion rate is ambiguous — and comparing rates with different bases is meaningless.
- New vs returning visitors
New vs returning classifies a visitor by whether the analytics tool recognizes them from a prior visit, usually via a client identifier. The split is fragile: cleared cookies, multiple devices, private browsing, and privacy-driven storage limits all make returning visitors look new. So the 'new' share is systematically overstated, and the dimension says more about identifier persistence than loyalty.
- CTA tracking
Measure first-party click-through on your CTAs.
Sources and verification notes
- Google — Search Console: clicks, impressions, CTR, position
- IAB/MRC — Viewable ad impression measurement guidelines
Last reviewed 2026-06-24. Facts are checked against primary/official sources where available; uncertain specifics are marked “Data not yet verified” rather than guessed.