--- title: "Click-to-Open Rate (CTOR) — Email Metric Guide | OWOX" canonical: "https://www.owox.com/metrics/click-to-open-rate" updated: "2026-09-21" --- ![](https://cdn.owox.com/www/content-marketing-marketingmetrics/ad-click-through-rate/icon/1.svg/public) Metric · 2 min read # Click-to-open rate Click-to-Open Rate measures how many users clicked a link in your email after opening it. Here’s everything you need to know: what it is, why it matters, how to calculate it, and how to improve it! Formula Click-to-Open Rate (%) · \= · Unique ClicksUnique Opens · × 100 **Example.** If 1,000 recipients opened your email and 150 of them clicked a link, your Click-to-Open Rate is 15%. This means 15% of engaged readers interacted further with your message. ## Overview ## What it is Click-to-Open Rate is an email marketing metric that shows the percentage of recipients who clicked on a link after opening your email. It helps you evaluate how engaging your email content and design are for those who actually opened it. ## Why it matters Click-to-Open Rate gives insight into the effectiveness of your email content, call-to-action, and design. Unlike click-through rate, it focuses only on those who opened the email, helping you measure the true quality of your messaging. ## How it is calculated Divide the number of unique clicks by the number of unique opens, then multiply by 100 to express it as a percentage. ## Good and bad values ## A good value A good Click-to-Open Rate is typically between 10–20%, depending on your industry. Higher rates mean your email content is compelling and encourages users to act. ## A bad value A low Click-to-Open Rate (below 5%) may signal weak copy, poor design, or unclear calls-to-action—even if your subject line worked well. ## Do Use these proven techniques to improve your Click-to-Open Rate and increase email engagement. 1. 01 ### Strengthen your call to action Use bold, benefit-driven CTAs that stand out visually and guide readers toward the next step. 2. 02 ### Personalize email content Tailor content based on user behavior or segments to boost relevance and increase interaction. 3. 03 ### Design for clarity and flow Make emails visually appealing, mobile-friendly, and easy to scan so users reach and click your links effortlessly. ## Avoid 1. Don’t overload emails with too many links or bury your CTA. Neglecting design or testing can lead to disengaged readers. ## Related metrics ## Related metrics you might be interested in [Average Engagement Rate`= (Total Engagements ÷ Total Impressions or Followers) × 100`](/metrics/average-engagement-rate) [Bounce Rate`= (Single-Page Sessions ÷ Total Sessions) × 100`](/metrics/bounce-rate) [Conversion Rate`= (Total VisitorsConversions​) × 100`](/metrics/conversion-rate) [Exit Rate`= (Total Exits from Page ÷ Total Pageviews for Page) × 100`](/metrics/exit-rate) [Emails Sent`= Total Number of Emails Processed for Delivery in a Campaign`](/metrics/emails-sent) ## Related articles ## Articles that use Click-to-Open Rate (CTOR) [data integration · How to load Open Exchange Rates into BigQuery with OWOX Data Marts · Oct 26, 2026](/blog/articles/free-open-exchange-rates-to-bigquery-connector) [data modeling · What is Apache Ossie? The Open Standard for Semantic Models, Explained · Oct 19, 2026](/blog/articles/apache-ossie) [data analytics · Data lakehouse architecture: the layers, open table formats and how to build one · Oct 15, 2026](/blog/articles/data-lakehouse-architecture) ## Customer stories ## Learn how teams ship analytics faster Organizations that scaled analytics without scaling headcount [All case studies →](/blog/success-stories) [Pürblack · "For 10 years I was blind." The day Pürblack® founder stopped guessing · Seconds · to get reports across six channels · Read the story](/blog/success-stories/purblack) [Reformation · How OWOX Reports Helped Reformation Make Data-Backed Decisions · Minutes · from data request to business decision · Read the story](/blog/success-stories/reformation) [WorkSimpli · How OWOX Reports Streamlined Operations for WorkSimpli, Saving Over 10 Hours Weekly · 10hrs+ · saved per week on manual reporting · Read the story](/blog/success-stories/worksimpli) ## What users are saying ## Not testimonials. Comment threads. Real things real customers said — each quote pinned to a specific claim, straight from the quotes database. A9 · re: one source of truth ![Mark Simmons](https://cdn.owox.ai/www/webflow/6a7b298b2b9daab0ade631d7_mark-headshot.png/public) Mark Simmons · CMO, Pürblack® > _“We had six or seven different channels and no single source of truth — it was almost impossible, a lot of guesswork.”_ C3 · re: golden data ![Nodari Rizun](https://cdn.owox.ai/www/webflow/6a7b298b2ca5055443187566_nodari-headshot.png/public) Nodari Rizun · Founder & CEO, Pürblack® > _“Golden data is clean data — the measure of reality, true and not false, that you can trust based on its source. If you have that, you're good.”_ E5 · re: dashboards vs truth ![Nodari Rizun](https://cdn.owox.ai/www/webflow/6a7b298b2ca5055443187566_nodari-headshot.png/public) Nodari Rizun · Founder & CEO, Pürblack® > _“Most businesses look at a Shopify or Google Analytics dashboard and think it's the source of truth. It's not — that data was never cleaned.”_ ## Your New Normal Calculate Click-to-Open Rate (CTOR) on your own data. OWOX Data Marts integrates with your email platform to track and compare Click-to-Open Rate by campaign, audience, and content type. Use this insight to refine your messaging and boost engagement. * No AI hallucinations * Analyst-governed definitions * Every number traces to SQL [Get started free](https://www.owox.com/app-signup) ## Book a call You are booked. The invitation is on its way to , with the calendar invite and the meeting link. [Reschedule](#) [Cancel](#) ## Schedule a meeting ## Schedule in person meeting at Tip Top Toronto You are booked. The invitation is on its way to , with the calendar invite and the meeting link. [Reschedule](#) [Cancel](#) ## Links Pages this page links to, on this site and on docs.owox.com. Where the page has a Markdown twin, its address follows the link. - [Average Engagement Rate= (Total Engagements ÷ Total Impressions or Followers) × 100](https://www.owox.com/metrics/average-engagement-rate) — /metrics/average-engagement-rate.md - [Bounce Rate= (Single-Page Sessions ÷ Total Sessions) × 100](https://www.owox.com/metrics/bounce-rate) — /metrics/bounce-rate.md - [Conversion Rate= (Total VisitorsConversions​) × 100](https://www.owox.com/metrics/conversion-rate) — /metrics/conversion-rate.md - [Exit Rate= (Total Exits from Page ÷ Total Pageviews for Page) × 100](https://www.owox.com/metrics/exit-rate) — /metrics/exit-rate.md - [Emails Sent= Total Number of Emails Processed for Delivery in a Campaign](https://www.owox.com/metrics/emails-sent) — /metrics/emails-sent.md - [data integration · How to load Open Exchange Rates into BigQuery with OWOX Data Marts · Oct 26, 2026](https://www.owox.com/blog/articles/free-open-exchange-rates-to-bigquery-connector) — /blog/articles/free-open-exchange-rates-to-bigquery-connector.md - [data modeling · What is Apache Ossie? The Open Standard for Semantic Models, Explained · Oct 19,…](https://www.owox.com/blog/articles/apache-ossie) — /blog/articles/apache-ossie.md - [data analytics · Data lakehouse architecture: the layers, open table formats and how to build one ·…](https://www.owox.com/blog/articles/data-lakehouse-architecture) — /blog/articles/data-lakehouse-architecture.md - [All case studies →](https://www.owox.com/blog/success-stories) — /blog/success-stories.md - [Pürblack · "For 10 years I was blind." The day Pürblack® founder stopped guessing · Seconds · to get…](https://www.owox.com/blog/success-stories/purblack) — /blog/success-stories/purblack.md - [Reformation · How OWOX Reports Helped Reformation Make Data-Backed Decisions · Minutes · from data…](https://www.owox.com/blog/success-stories/reformation) — /blog/success-stories/reformation.md - [WorkSimpli · How OWOX Reports Streamlined Operations for WorkSimpli, Saving Over 10 Hours Weekly ·…](https://www.owox.com/blog/success-stories/worksimpli) — /blog/success-stories/worksimpli.md - [Get started free](https://www.owox.com/app-signup)