Click-to-Open Rate (CTOR) is a valuable metric in email marketing that helps measure the effectiveness of an email campaign in terms of recipient engagement. It specifically calculates the percentage of recipients who clicked on a link, button, or call-to-action (CTA) within the email after opening it.

To calculate CTOR, you divide the total number of unique clicks by the total number of unique email opens and then multiply by 100 to get the percentage.

The CTOR metric is insightful because it evaluates the engagement of those who actually opened the email. It provides a clearer view of the email content's ability to drive action or interest among the recipients.

A high CTOR typically indicates that the email's content, design, and CTA were compelling, leading to a significant portion of recipients taking the desired action. On the other hand, a low CTOR suggests that the content or CTA may not have resonated well with the audience, and improvements may be needed to boost engagement.

Understanding Click-to-Open Rate is vital for email marketers and campaign analysts to assess the performance of email campaigns accurately. By analyzing CTOR and making data-driven adjustments to email content and design, marketers can optimize their campaigns to enhance engagement and achieve desired goals.