How is the Click to Open Rate calculated?

The click-to-open rate (CTOR) measures the percentage of recipients who opened the email and clicked on that link. To find the CTOR of the above example, we wouldn’t care about how many people actually received the email in their inboxes. Instead, we’d only want to know how many people opened it and then went on to click the CTA. Out of 100,000, maybe 50,000 recipients clicked to open the message. Then, 1,000 went on to click the link, so your CTOR is 2%.

The Click to Open Rate (CTOR) is found by dividing Unique Clickthrough/Unique Opens. This KPI gives you an indication of how relevant your email content is to those that opened it.