Click-Through Rate (CTR)
CTR is unique clicks divided by delivered emails. It tells you whether subject lines, content, and CTAs convince readers to act.
Click-through rate (CTR) is unique clicks divided by delivered emails, showing how many recipients took action.
Definition and examples
Click-through rate (CTR) measures the percentage of delivered emails where recipients clicked at least one tracked link. Unlike open rate, which only indicates initial interest, CTR reflects genuine engagement and intent to take action. It's a critical metric that bridges the gap between passive email consumption and active user behavior. CTR serves as a strong predictor of campaign effectiveness because it measures actual engagement beyond mere curiosity. When recipients click through your email, they're demonstrating real interest in your content, offer, or message.
Why it matters
It matters because CTR shows whether the message created enough interest to earn a click. It is one of the clearest ways to judge whether the email moved someone past passive attention.
How CTR is calculated
The basic formula is unique clicks divided by delivered emails, multiplied by 100. If 490 recipients click out of 9800 delivered emails, the CTR is about 5 percent.
Common mistakes
A common mistake is treating the number like a verdict instead of a clue. The better move is to compare it by segment, campaign type, and time period, then pair it with the next metric downstream.
Related terms
Key takeaways
CTR measures actual engagement beyond passive opens, making it a stronger predictor of campaign success
Benchmarks vary by audience and email type, so trend direction usually matters more than one static target
Optimization requires focus on content relevance, design clarity, and mobile usability