U
UseCalcForge Free Online Calculators
Tools
Publishing Science Developer Finance
 
Health Marketing Lifestyle All Tools
Contact Us
Marketing

Email Open Rate & CTR Calculator.

Open rate, click-through rate, and click-to-open rate from your campaign numbers.

Open rate

%

Click-through rate (CTR)

%

Clicks ÷ delivered

Click-to-open rate (CTOR)

%

Clicks ÷ opens

Enter delivered emails, not sent — sent includes bounces that never reached an inbox and would understate every rate below. Since Apple Mail Privacy Protection, open counts are inflated for any list with a meaningful share of Apple Mail users, so treat open rate as a directional trend indicator rather than an exact figure.

Runs entirely in your browser. The values you enter never leave your device — there is no request to our server and nothing is stored. How we handle data

Three Related Rates, Three Different Questions

Open rate, click-through rate, and click-to-open rate all use the same three numbers, but each answers a different question about where a campaign is succeeding or failing.

Formulas

Open Rate = Opened ÷ Delivered × 100
Click-Through Rate (CTR) = Clicked ÷ Delivered × 100
Click-to-Open Rate (CTOR) = Clicked ÷ Opened × 100

CTOR is the diagnostic worth watching alongside the other two: a low open rate paired with a high CTOR points at a subject-line or send-time problem, since the people who did open clearly found the content compelling. A healthy open rate paired with a low CTOR points the other way, at the email's body content or call to action rather than its subject line.

Why Open Rate Alone Is Less Reliable Than It Used To Be

Apple Mail Privacy Protection, introduced in 2021, pre-loads a tracking pixel for Apple Mail users automatically whether or not the recipient actually opens the email — which inflates measured open rate for any list with a meaningful share of Apple Mail or iOS Mail users, and does so inconsistently across lists depending on that share.

Compare trend over time, not the absolute number

Since the same inflation applies consistently across a given list's campaigns over time, week-over-week or campaign-over-campaign open rate trends remain meaningful even though the absolute figure is inflated.

Click-through rate is not affected the same way

A click requires an actual recipient action, not an automatic pixel load, so click-through rate and click-to-open rate remain more reliable signals of genuine engagement than open rate alone.

Segment by known Apple Mail share where possible

Email platforms that report client-type breakdowns allow a rough correction — filtering out or separately reporting Apple Mail opens gives a truer picture of genuine open behavior for the rest of the list.

Rough Benchmarks, Read Cautiously

Open rates in the 15%–25% range and click-through rates in the 2%–5% range are commonly cited industry averages, but both vary enormously by list size, list age, industry, and send frequency — a highly engaged niche newsletter list will comfortably beat both figures, while a large, infrequently-emailed purchased or scraped list will fall well short of them regardless of content quality.

Knowledge Base

Email Engagement Metrics Methodology.

Open rate, click-through rate, and click-to-open rate come from the same three campaign numbers, but reading them together — rather than any single one alone — is what actually points at whether a subject line, a send time, or the email content itself needs attention.

The Calculation Branch

Open Rate = Opened ÷ Delivered × 100 | Click-Through Rate (CTR) = Clicked ÷ Delivered × 100 | Click-to-Open Rate (CTOR) = Clicked ÷ Opened × 100

Industrial Standards.

This tool divides opened emails, and separately clicked emails, by delivered emails to produce open rate and click-through rate, and divides clicked emails by opened emails to produce click-to-open rate. Delivered, not sent, is the correct denominator for all three, since sent includes bounces that never reached an inbox and would otherwise understate every rate.

In-Depth Analysis & Reference Data

Since Apple's Mail Privacy Protection began automatically pre-fetching tracking pixels in 2021, reported open rate has become a less trustworthy absolute number industry-wide, particularly for lists with a large share of iOS or Apple Mail users. Click-through rate and click-to-open rate, both of which require a genuine recipient action rather than an automatic pixel load, have become the more reliable engagement signals as a result — open rate is still useful as a relative trend indicator across a list's own campaign history, just less useful as an absolute benchmark against other lists.

Click-to-open rate in particular isolates content quality from subject-line and deliverability effects, since it only considers people who already opened the email. A campaign with a mediocre open rate but a strong click-to-open rate suggests the content resonates with whoever sees it — the opportunity is in getting more people to open it, not in changing what is inside.

Registry Questions & FAQ.

Why does my open rate look higher than it used to, with no change in strategy?

Apple Mail Privacy Protection, rolled out in 2021, automatically pre-loads tracking pixels for Apple Mail users regardless of whether they open the email, inflating measured open rate for any list with a meaningful Apple Mail share — a platform-wide shift, not something specific to one list or campaign.

Which metric should I fix first: open rate or click-through rate?

Whichever is comparatively weaker relative to typical benchmarks for a similar list. A weak open rate points at subject line, sender reputation, or send timing; a weak click-to-open rate with a healthy open rate points at the email body content or call to action instead.

All metrics verified against ISO/ASTM benchmarks.