Click-to-open rate (CTOR) is the percentage of opened emails in which a recipient clicked at least one link, calculated as unique clicks divided by unique opens. Because it looks only at people who actually opened, it measures how compelling your email's content and calls to action are once it has been seen.
CTOR vs click-through rate
Click-through rate divides clicks by delivered emails, so it blends reach and content. CTOR divides clicks by opens, isolating content quality from subject-line and deliverability effects. Reviewing both tells you whether to improve your subject line or your body. See how Mailpro reports click statistics.
Why it matters
A high CTOR means the content resonates with those who open it — a clear signal your message and offer are working. Mailpro's click analysis shows exactly which links get clicked. Read our guide to improving click-through rate. Related: click-through rate and open rate.
Mailpro and email metrics
See what your readers actually click
Mailpro tracks opens and clicks per subscriber, so you can sharpen content with real engagement data.