Email Open Rate Calculator
Find your email open rate from opens and delivered.
Results update as you type.
How it works
Open rate is a headline metric for email marketing, and this calculator computes it. You enter the number of emails delivered and the number opened, and it returns the open rate as a percentage along with how many went unopened. The open rate is opens divided by delivered emails, times 100. Using delivered rather than sent is important: bounced emails never reached anyone, so including them would unfairly lower the rate. Open rate indicates how compelling your subject lines are and how engaged your audience is, since recipients decide whether to open based largely on the sender name and subject. Typical open rates vary widely by industry, list quality, and audience, but many benchmarks fall in the range of roughly 15 to 30 percent, so comparing to your industry and your own past campaigns is more useful than a universal target. To improve open rates, write clear and enticing subject lines, keep your list clean and engaged, send at good times, and maintain sender reputation to stay out of spam folders. One caveat worth knowing: open tracking relies on a tracking pixel loading, and privacy features like Apple's Mail Privacy Protection can inflate or obscure opens, so many marketers now treat open rate as a directional signal and weight clicks and conversions more heavily. Enter your delivered and opened counts to find the open rate.
Open rate = (emails opened / emails delivered) × 100
The email open rate is the percentage of delivered emails that recipients opened. It divides the number of opens by the number of emails successfully delivered, not the number sent, then multiplies by 100. Using delivered rather than sent gives a fairer measure by excluding bounced emails.
Source:Email marketing metrics
We review all our tools from time to time to ensure accuracy.
Worked example
How to use this calculator
- 1
Enter your values
Enter emails delivered and emails opened.
- 2
Adjust the options
Fine-tune any options to match your situation.
- 3
Read your result
Open rate updates instantly as you type — no button to press.
Frequently asked questions
How is email open rate calculated?
Divide the number of emails opened by the number delivered, then multiply by 100 for a percentage. Delivered is used instead of sent so that bounced emails, which never arrived, do not unfairly reduce the rate. The calculator returns the open rate and the count of unopened emails from your figures.
What is a good email open rate?
Open rates vary widely by industry, audience, and list quality, but many benchmarks fall between roughly 15 and 30 percent. Rather than chasing a universal number, compare your open rate to your industry average and to your own previous campaigns. A rising trend over time is a strong sign of improving engagement.
Why use delivered instead of emails sent?
Some emails sent never reach the inbox because they bounce, due to invalid addresses or full mailboxes. Since no one could open a bounced email, including them in the denominator would understate how compelling your campaign was to people who actually received it. Using delivered gives a fairer, more accurate open rate.
How can I improve my open rate?
Write clear, specific, and enticing subject lines, use a recognizable sender name, and keep your list clean by removing inactive and invalid addresses. Segmenting your audience, sending at times your readers are active, and maintaining a good sender reputation all help. Testing different subject lines reveals what resonates with your specific audience.
Are open rates still reliable?
Open tracking depends on a tiny tracking image loading in the email, and privacy features such as Apple's Mail Privacy Protection can pre-load images or hide opens, inflating or obscuring the numbers. As a result, many marketers now treat open rate as a directional indicator and put more weight on click-through and conversion rates, which reflect deeper engagement.