Free Email Open Rate Calculator. Measure email engagement and optimize campaign performance.
Free Email Open Rate Calculator. Measure email engagement and optimize campaign performance.
Generated: 1/13/2026, 7:20:46 AM | AskSMB.io
Number of emails successfully delivered
Number of emails opened
Internal reference name
Email Open Rate
Opened Emails
Unopened Emails
Email open rate is the percentage of recipients who opened your email out of all successfully delivered emails. It's a fundamental email marketing KPI that measures the effectiveness of your subject lines, sender reputation, and overall email appeal. The metric is tracked when a recipient's email client downloads the tracking pixel embedded in your email. While not perfect (some opens may not be tracked, and some may be false positives), it remains one of the most important indicators of email campaign performance.
Email open rate is the first critical step in your email marketing funnel. Without opens, there can be no clicks, conversions, or revenue. A strong open rate indicates that your subject line resonated, your sender name is trusted, and your timing was right. It also affects your sender reputation with email service providers—consistent high open rates signal that recipients want your emails, improving deliverability and reducing the likelihood of landing in spam folders. Low open rates, conversely, can damage your sender score and decrease future campaign performance.
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Results:
This campaign achieved a 23% open rate, which is solid average performance. While this is respectable, there's opportunity to move into the "high engagement" category (above 25%) through subject line optimization, better segmentation, and send time testing. The 7,700 unopened emails represent potential for growth—analyzing what worked for the 2,300 who did open can inform strategies to engage more of the remaining audience.