Click-to-Open Rate (CTOR)
The percentage of email recipients who clicked a link out of those who opened the email, isolating content engagement from deliverability and subject line performance.
CTOR Tells You If Your Email Content Actually Works
Open rate tells you if people opened the email. CTR tells you the blended performance. CTOR strips away everything except the one question that matters: did the people who read your email find it compelling enough to click?
This distinction is critical for optimization. If your open rate is 30% and your CTR is 3%, you might think the campaign underperformed. But if your CTOR is 10%, that is actually solid — the subject line did its job, the content engaged readers at an acceptable rate, and the real problem might just be list size. CTOR separates the diagnosis so you can fix the right thing.
How to Calculate CTOR
CTOR = (Unique Clicks / Unique Opens) x 100
If 1,000 people opened your email and 120 clicked a link, your CTOR is 12%. Always use unique counts — multiple clicks from the same person should count once.
| Email Type | Low CTOR | Average CTOR | Strong CTOR |
|---|---|---|---|
| Newsletter | < 8% | 10-15% | 18%+ |
| Product update | < 10% | 15-20% | 25%+ |
| Promotional offer | < 5% | 8-12% | 15%+ |
| Cold outbound | < 3% | 5-8% | 10%+ |
How to Improve CTOR
Your CTA is the biggest lever. One clear CTA outperforms multiple CTAs by 30-40% — decision fatigue kills clicks. Make the CTA specific (“See the 3-minute demo” beats “Learn more”). Place it above the fold and repeat it at the bottom. For the email body, lead with the value proposition in the first two sentences. If readers have to scroll to understand why they should care, you have already lost them. Use formatting that scans — short paragraphs, bold key phrases, bullet points. Nobody reads a wall of text in an email.
Frequently Asked Questions
What is a good CTOR for B2B SaaS?
10-15% CTOR is average for B2B marketing emails. 15-25% is strong. Above 25% means your content is genuinely compelling to your audience. Cold outbound should aim for 5-10% CTOR. If your CTOR is below 8% on marketing emails, your email body copy, CTA, or offer is not resonating — the subject line got them in, but the content did not deliver.
How is CTOR different from CTR?
CTR (click-through rate) divides clicks by total emails delivered. CTOR divides clicks by emails opened. CTR blends subject line performance with content performance. CTOR isolates content performance — it only measures engagement among people who actually read the email. Use CTR for overall campaign performance. Use CTOR to evaluate your email body copy and CTA effectiveness.
