Open Rate
Open rate is the percentage of delivered emails that are opened, offering a top-level indicator of how effectively your subject line and sender name attract attention.
Open rate is the share of delivered emails that were opened, indicating how well your subject, sender name, and preview text drew attention.
Definition and examples
Open rate measures the percentage of delivered emails that recipients open at least once. It serves as a top-of-funnel metric that indicates how effectively your subject line, sender name, and preview text capture attention and motivate recipients to engage with your message. While open rate has limitations due to privacy changes and tracking inconsistencies, it remains a valuable directional indicator for email performance and optimization efforts.
Why it matters
It matters because open rate can still help you compare subject lines, audience resonance, and inbox visibility, even though privacy features make it an imperfect metric.
How open rate is calculated
The basic formula is unique opens divided by delivered emails, multiplied by 100. If 10000 emails are sent, 200 bounce, and 2450 unique recipients open the message, the open rate is about 25 percent.
Common mistakes
A common mistake is treating the number like a verdict instead of a clue. The better move is to compare it by segment, campaign type, and time period, then pair it with the next metric downstream.
Related terms
Key takeaways
Open rate remains a valuable directional metric despite privacy-related limitations and tracking challenges
Focus on optimizing subject lines, sender names, and preview text for maximum initial engagement
Complement open rate analysis with click-through rates and conversion metrics for complete performance picture