Open rate is a key email marketing metric. It shows the percentage of recipients who opened your email. A higher open rate means more people are seeing your message.
The formula for calculating Open Rate is:

In this example, suppose if we sent emails to 200 subscribers, 100 of them were successfully delivered, and 60 of them were opened, the Open Rate calculation will be:

Here, Open Rate is 60%. Higher Open Rate generally indicates that your audience is interested in the content of your emails, while a lower Open Rate may suggest the need for adjustments in your email strategy or email content.