Newsletter open rate calculator

Worked example

• Unique recorded openers: 4,000
• Delivered emails: 10,000

Recorded open rate · 40%

How to interpret the result

Recorded opens can include automated image loads. Use clicks or another observable action when testing engagement.

Publisher example

1,500 recorded openers out of 5,000 deliveries gives 30%. If opens rise but clicks stay flat after the audience mix changes, check for privacy-related image loads before changing the subject line.

Related reading: Apple Mail Privacy Protection makes opens unreliable as a measure of reading

Measurement reference: Mailchimp open and click measurement