Click-to-Open Rate is the percentage of email openers who clicked a link inside the email.
Click-to-Open Rate is the percentage of email openers who clicked a link inside the email. A common calculation is: (Unique clicks ÷ unique opens) × 100. In email marketing, this term gives marketers, designers, developers, and business owners a precise way to talk about work that affects visibility, user experience, measurement, and revenue. A strong understanding of Click-to-Open Rate prevents teams from optimizing isolated tasks without knowing what business result they are supposed to support. The concept should always be applied with context: who the audience is, what problem they have, what action matters, how success will be measured, and how the work connects to the broader customer journey.
Example of Click-to-Open Rate
Example: If 1,000 people open an email and 120 click, CTOR is 12%. This helps evaluate the content and CTA after the subject line has already earned the open.
Why Click-to-Open Rate matters
It matters because email is one of the few channels a business can own directly. Strong email fundamentals improve trust, deliverability, segmentation, and long-term lead nurturing.
Related terms
CTOR, CTR, conversion rate, click-through rate, email template, open rate
Frequently Asked Question
What does Click-to-Open Rate mean?
Click-to-Open Rate means the percentage of email openers who clicked a link inside the email. It matters in email marketing because it helps teams make clearer decisions, measure the right outcomes, and connect marketing work to business goals.