Tool
Email Open Rate Calculator
Calculate open rate and understand what it tells you about subject lines, list health, and sender reputation.
Summary
Open rate = Opens ÷ Delivered × 100. Modern open rates are inflated by Apple Mail Privacy; treat the number as directional, not absolute.
Open rate
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What open rate tells you
Open rate is a first-glance signal of subject line effectiveness and list engagement. It is not a reliable absolute measure since Apple Mail Privacy and some corporate clients auto-open every email. Use open rate to compare subject lines or segments against each other, not as a hard target.
What affects open rate
- Subject line and preview text
- Sender name recognition
- Time of send and recipient timezone
- List health — recent sign-ups open more than long-dormant lists
- Sender reputation (authentication, spam score)
What to check if opens drop
- Has list growth stalled? Dormant contacts depress rates
- Any authentication issues (SPF/DKIM/DMARC)?
- Are you segmenting too broadly?
- Have subject lines become templated?
Frequently asked questions
Should I focus on open rate or click rate?
Click rate is more reliable. Use open rate directionally, click rate operationally.
Next step
Keep exploring related resources to strengthen this area of the business.
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