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Email open rate calculator

Compute the open rate of an email campaign from opens and delivered emails.

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Enter Opens, Delivered emails and the Email open rate calculator works out Open rate straight away. For instance, with Opens = 350 and Delivered emails = 1,000 it returns Open rate = 35%.

How to use it

  1. Enter your values: Opens, Delivered emails.
  2. Read the result instantly: Open rate.

Frequently asked questions

What does the Email open rate calculator actually compute?

It takes Opens and Delivered emails and derives Open rate from them. The calculation is live as you type, so the result updates on every change.

What information do I need to provide?

2 values: Opens and Delivered emails. Nothing else is required — no account, no file upload.

Can you show a worked example?

With Opens = 350 and Delivered emails = 1,000, the calculator returns Open rate = 35%. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

When would I actually use this?

Reading a send properly: what the open and click rates mean once bounces are removed, how fast the list is decaying, and what volume a target reply count needs.

What is the most common mistake?

Treating the open rate as a measure of interest. Image-blocking and privacy proxies open messages nobody read, and inflate the figure by a margin that varies with the audience's mail client.

What is the difference between the Email open rate calculator and the Click-to-open rate (CTOR) calculator?

This one returns Open rate; the Click-to-open rate (CTOR) calculator returns Click-to-open rate. That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Email list growth rate calculator is the closest one after this: Compute the net growth rate of your email list from new subscribers and unsubscribes.

What else is worth having open alongside it?

Email marketing ROI calculator and Email signature — they come up in the same task often enough to be worth a second tab.

Where do the figures come from, and how current are they?

The rates are computed from the figures you supply. Whether your platform divides by sends or by deliveries changes every percentage, so compare within one tool rather than across two.

Further reading

All guides →
ExplainerOpen Rate Is a Measurement of Your Audience's Mail ClientThe denominator should be delivered, not sent — which means defining hard and soft bounces properly. Unique and total opens are different numbers. And a reported open rate has a computable null point: past a certain share of prefetching clients it carries no information about humans at all. The instrumentation that replaces it.ExplainerEmail Open Rate Is Broken. Measure Click-to-Open InsteadApple Mail Privacy Protection pre-fetches tracking pixels, so a share of your opens were never opened by a person. Open rate now moves with your audience's mail client. Here is what survives, worked on a single send.GuideEngagement Rate Formulas by Platform: Why the Same Post Scores 2% and 4.8%Engagement rate is not one metric. Divide by followers, by reach or by impressions and the same post returns three different numbers — and every platform defaults to a different denominator.ExplainerWhat an Email Programme Actually ReturnsThe famous email ROI multiples are self-reported survey figures with the labour left out of the denominator and revenue that would have arrived anyway left in the numerator. Build the honest version instead: incremental revenue against full cost, measured with a holdout — and the arithmetic of how big that holdout has to be.ExplainerBounce Rate Is Not What Most People Think It IsA bounce was never a measure of dissatisfaction — it was a session that sent one hit. Google Analytics 4 replaced the definition entirely, and the new one is a configurable timer. Here is the same thousand sessions read five ways.How-toHow to Calculate NPS: The Formula, a Worked Score, and What It HidesPercentage of promoters minus percentage of detractors. Passives sit in the denominator and nowhere else, the result runs from −100 to +100, and it is not a percentage despite looking like one.