Email open rate formula
Email open rate = opened emails / delivered emails × 100. Use delivered emails rather than total sent so bounces do not distort the result.
Free outbound tool
Free Email Open Rate Calculator
Calculate open rate, delivery rate, reply rate, positive reply rate, bounce rate, and unsubscribe rate.
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Email open rate calculator
Calculates opens, replies, positive replies, and funnel leakage against outbound benchmarks.
Delivery rate
93.0%
Delivered / sent
Open rate
55.9%
Opened / delivered
Reply rate
5.16%
Replies / delivered
Positive rate
1.51%
Positive / delivered
Bounce rate
3.50%
Bounces / sent
Unsub rate
0.86%
Unsubs / delivered
Open rate is within a workable cold-email range.
Reply rate is healthy enough to keep testing offer angles.
Bounce rate is high; clean the list or add verification before the next send.
Unsubscribe pressure is controlled.
What this tool should cover
A useful calculator page should include the formula, campaign inputs, metric definitions, benchmarks, examples, and guidance for improving open rates.
What the result means
A low open rate can point to deliverability, sender reputation, subject lines, or audience fit. For cold email, pair open rate with reply rate and positive reply rate.
How to improve open rate
Improve domain authentication, reduce bounces, write clearer subject lines, tighten targeting, and avoid sudden volume spikes from new domains.
Frequently asked questions
How do you calculate email open rate?
Divide opens by delivered emails, then multiply by 100.
What is a good email open rate?
It depends on audience and channel. For cold outbound, evaluate open rate together with reply rate, positive reply rate, and bounce rate.
Should I use sent or delivered emails?
Use delivered emails for open rate. Sent emails include bounces, which are a separate list-quality and deliverability signal.
Why can open tracking be unreliable?
Image blocking, privacy features, and proxy opens can inflate or suppress measured opens, so use replies and meetings as stronger outcome metrics.
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