Click-Through Rate
The percentage of users who click on a specific link, button, or call-to-action out of the total number who viewed it — a core engagement metric in digital marketing.
Click-through rate (CTR) is one of the most frequently cited metrics in digital marketing, and one of the most frequently misused. At its core, CTR = Clicks ÷ Impressions × 100. But what counts as an "impression" and what counts as a "click" varies dramatically by context.
CTR Across Channels
Email CTR: clicks on links within an email divided by delivered (or opened) emails. Ad CTR: clicks on an ad divided by ad impressions. On-page CTR: clicks on a CTA divided by page visitors who saw the CTA. Each context has different benchmarks and different implications.
Why CTR Alone Is Dangerous
A high CTR doesn't mean high revenue. I've seen landing page variants with 40% higher CTR on the primary CTA but 15% lower conversion rate — because the CTA text overpromised and the next page underdelivered. CTR measures interest, not intent. Always pair CTR with downstream metrics.
What Matters More: CTR or Conversion Rate?
This is a common interview question. The answer: it depends on what you're optimizing. For top-of-funnel awareness, CTR matters because you need attention. For bottom-of-funnel conversion, conversion rate matters because you need action. For revenue, neither alone is sufficient — you need CTR × CR × AOV.
Practical Application
Use CTR as a diagnostic metric, not a success metric. If CTR is low, your message or creative isn't resonating. If CTR is high but conversions are low, there's a messaging disconnect between the click source and the landing experience.