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Email Open Rate Calculator: Open, CTR and CTOR

Enter three numbers from your last campaign and get your open rate, click-through rate and click-to-open rate instantly and free.

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Open rate
23%
Click-through rate
3.8%
Click-to-open rate
16.5%

Your open rate is 23%, but remember Apple Mail Privacy Protection inflates opens, so lean on your 16.5% click-to-open rate as the truer measure of engagement.

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Email open rate is the share of delivered emails that get opened, and it is the first number most marketers reach for. It is useful, but it is only one of three engagement metrics worth tracking. The calculator above works out your open rate, click-through rate and click-to-open rate together so you can read a campaign properly rather than judging it on opens alone.

How to calculate email open rate

Open rate is emails opened divided by emails delivered, times 100. If 2,300 of 10,000 delivered emails were opened, that is a 23% open rate. Use delivered rather than sent so that bounced messages do not drag the figure down.

Two companion metrics tell you what happened after the open. Click-through rate is link clicks divided by emails delivered, so it measures action across your whole audience. Click-to-open rate is clicks divided by opens, so it measures how persuasive your content was to the people who actually opened it. Together the three numbers separate three different things: whether the subject line earned attention, whether the audience took action, and whether the message itself did its job.

What is a good open rate?

There is no single right answer. Good ranges shift by industry, list quality, list size and the kind of email you send, so a number that looks strong for one sender is weak for another. As a loose guide, many senders see open rates somewhere from the low double digits up into the thirties, but that band is wide for a reason.

The bigger caveat is measurement. Apple Mail Privacy Protection pre-loads the tracking pixel for Apple Mail users, which records an open whether or not anyone read the email. Because a large slice of inboxes are affected, reported open rates are inflated and inconsistent from one audience to the next. That makes open rate a soft signal. Click-to-open rate and click-through rate rely on real clicks, so they are harder to game and far more useful for judging a campaign. The most reliable benchmark is your own history: compare this send against your past sends to the same list.

How to improve open and click rates

To lift opens, focus on the subject line and preview text, since those are the only things a subscriber sees before deciding. Keep them specific and relevant rather than clever for its own sake, and clean inactive subscribers off your list so your engaged audience is not diluted. Segmentation is the highest-leverage move: when each group gets content that fits where they are, both opens and clicks rise.

To lift clicks, work on the offer and the clarity of your call to action, and test send times against your own data rather than generic best-time charts. Small wording changes can move click-to-open rate, but the durable gains come from making the message genuinely more relevant to the person reading it. If your list growth has stalled, the constraint is often upstream: you need more of the right people finding you in the first place. That is where organic search earns its keep, feeding a steady stream of qualified subscribers into the top of your list.

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FAQ

Email Open Rate Calculator: questions, answered

How do you calculate email open rate?
Divide the number of emails opened by the number of emails delivered, then multiply by 100. If 2,300 of 10,000 delivered emails were opened, your open rate is 23%. Always use delivered, not sent, so bounces do not distort the figure.
What is a good email open rate?
It varies a lot by industry, list quality and how you measure opens. As a rough guide many senders see open rates somewhere in the low double digits to the low thirties, but these numbers are inflated by Apple Mail Privacy Protection, so treat any single benchmark with caution and compare against your own past campaigns.
What is the difference between CTR and click-to-open rate?
Click-through rate is clicks divided by emails delivered, so it measures clicks across your whole audience. Click-to-open rate is clicks divided by emails opened, so it measures how compelling your content was to the people who actually opened. Click-to-open rate isolates message quality from subject-line and deliverability effects.
Why is open rate less reliable than it used to be?
Apple Mail Privacy Protection pre-loads the tracking pixel for Apple Mail users, which registers an open whether or not the person read the email. Because a large share of inboxes are affected, reported open rates are inflated and inconsistent. Click-to-open rate and click-through rate rely on real clicks, so they are the stronger signals.
How can I improve my email open and click rates?
Tighten your subject line and preview text, segment your list so each group gets relevant content, clean out inactive subscribers, and test send times against your own data. Improving the underlying offer and the relevance of the message usually moves click-to-open rate more than any subject-line trick.

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