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What is Click-to-Open Rate (CTOR)?
Click-to-open rate (CTOR) is the percentage of email recipients who clicked a link after opening the email. It shows how effective the content inside the email is at driving engagement once you’ve won the open. CTOR isolates content performance from open performance, giving you a clearer view of message relevance.
Why Click-to-Open Rate matters?
CTOR bridges the gap between open rate and click-through rate. A high open rate paired with a low CTOR signals that your subject line got attention, but the content did not meet expectations or inspire action. In ecommerce, CTOR is a strong indicator of offer quality, email design, and how well you match content to subscriber intent. Tracking CTOR helps refine merchandising strategies for email campaigns, ensuring you feature products, promotions, and storytelling that actually compel clicks. Without this metric, you may mistakenly attribute low clicks to poor open rates when the real issue lies in content.
How Click-to-Open Rate works?
CTOR = (Unique Clicks ÷ Unique Opens) × 100%. Unlike CTR, CTOR uses opens as the denominator, focusing purely on the audience that saw your content. CTOR can be influenced by layout, CTA placement, offer appeal, and product selection. Segmenting CTOR by campaign type (sale vs. content), audience segment (new vs. repeat buyers), and device type (mobile vs. desktop) will help uncover performance patterns. For ecommerce brands, consistent CTOR improvement usually involves optimizing imagery, simplifying navigation to product pages, and aligning offers with customer buying cycles.
Example in ecommerce
A fashion retailer’s holiday promo email has a 25% open rate but only a 5% CTOR. Analysis shows the email is image-heavy with small, low-contrast CTAs. The brand switches to larger, mobile-friendly CTAs and rearranges the email so top offers appear above the fold. The next campaign sees CTOR jump to 9%, resulting in a significant increase in sales from email traffic.
Common mix-ups
CTOR is not the same as CTR. CTR includes unopened emails in its calculation, making it less precise when diagnosing content issues. CTOR focuses exclusively on those who opened the email, which makes it more actionable for creative and content teams.
Best practices
- Place primary CTAs high in the email.
- Use large, mobile-optimized buttons.
- Feature high-quality product images linked directly to PDPs.
- Personalize product recommendations.
- Keep copy concise and action-oriented.
- Limit competing CTAs to avoid distraction.
- Align offers with the subscriber’s purchase history.
Industry benchmarks
- Ecommerce CTOR often ranges from 8-15%.
- Highly segmented, personalized campaigns can push CTOR above 20%.
- Mobile-first design is critical, over 60% of ecommerce email opens occur on mobile devices.
Related terms
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