Email Open Rate Calculator
Calculate Email Open Rate metrics for ecommerce, SaaS, marketing, and operations.
This email open rate calculator finds the percentage of delivered emails that were opened, a standard metric for gauging how well subject lines and sender reputation are performing.
Enter the number of emails opened and the number delivered, and the calculator returns your open rate.
Worked Calculation Examples
| Scenario | Result | Calculation Step |
|---|---|---|
| 2,500 opens out of 10,000 delivered | 25% open rate | Open rate = (2,500 ÷ 10,000) × 100 = 25%. |
| 900 opens out of 6,000 delivered | 15% open rate | Open rate = (900 ÷ 6,000) × 100 = 15%. |
The Open Rate Formula
Open rate = (emails opened / emails delivered) x 100. Using delivered emails (not sent emails) as the denominator matters, since bounced emails were never actually received and shouldn't count against your open rate performance.
Why Open Rate Data Has Become Less Reliable
Apple Mail Privacy Protection and similar features now automatically pre-load images (including open-tracking pixels) for many recipients, which can inflate open rates artificially regardless of whether a person actually read the email - many marketers now weight click-through rate more heavily than open rate as a result.
How to Use the Email Open Rate Calculator
- Open the Email Open Rate Calculator and enter the values requested in the input fields.
- Check the units, percentages, dates, or time periods before reading the answer.
- Review the instant result and adjust any value to compare another scenario.
- Use the formula, example, and FAQs below to understand how the email open rate calculator works.
Frequently Asked Questions
How do you calculate email open rate?
Divide the number of emails opened by the number of emails successfully delivered (not sent), then multiply by 100 for a percentage.
What is a good email open rate?
It varies significantly by industry and list quality, but many benchmarks fall in the 15-25% range, though these figures have become less reliable due to automatic image pre-loading by some email clients.
Why might my open rate be artificially inflated?
Privacy features in some email clients automatically load images, including tracking pixels, without the recipient actually opening or reading the email, which can make open rate data less accurate than it once was.
How do I use this email open rate calculator?
Enter the known values, review the units or settings, and the calculator updates the result instantly. The formula and example on this page show how the answer is produced.
What does the Email Open Rate Calculator calculate?
Calculate Email Open Rate metrics for ecommerce, SaaS, marketing, and operations. It is designed for fast browser-based calculations without sign-up, downloads, or manual spreadsheet setup.
What formula does this email open rate use?
The formula is: Open Rate = (Emails Opened ÷ Emails Delivered) × 100. Email open tracking relies on a tiny, invisible tracking pixel embedded in the message, a technique dating to the early days of commercial email marketing in the late 1990s. Apple's 2021 Mail Privacy Protection feature, which automatically pre-fetches images including tracking pixels for many iOS and macOS users, has since made raw open rate a measurably less reliable metric than it once was, pushing many marketers toward click-through rate as a more trustworthy engagement signal.
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Last updated: September 27, 2026.