Click to open rate (CTOR)

What is click to open rate?

Click to open rate (CTOR) is an email marketing metric that measures the percentage of recipients who clicked a link inside an email out of those who actually opened it. It shows how effective your email content, design, and offer were once a subscriber decided to read the message.

Open rate tells you how many recipients opened the email. CTOR goes one step further and reveals whether the body of your email and your call-to-action were compelling enough to drive a click. Because it only counts users who opened, CTOR isolates content performance from subject line and inbox placement performance.

For Shopify and DTC brands, CTOR is also one of the data points often rolled into a broader customer engagement score, making it useful well beyond a single campaign report.

CTOR vs CTR — what’s the difference?

CTOR and click-through rate (CTR) sound similar but answer different questions.

• CTOR measures clicks among people who opened the email. It reflects content and offer quality.
• CTR measures clicks against the total number of emails delivered, including those never opened. It reflects overall campaign performance, including subject line strength and deliverability.

A low CTR with a healthy CTOR usually means an open-rate problem (subject line, sender reputation, send time). A low CTR with a low CTOR points back to the email body, offer, or CTA.

What’s a good click to open rate?

A good CTOR typically falls between 10% and 20%, though the right benchmark varies by industry, list quality, and campaign type. Promotional broadcasts usually sit lower, while transactional, post-purchase, and triggered automations tend to perform higher because they are more relevant to the recipient.

One caveat to keep in mind: since Apple’s Mail Privacy Protection began auto-opening emails for many subscribers in 2021, open rates (and therefore CTOR) can be artificially inflated. Treat CTOR as a directional signal, compare it against your own historical performance, and pair it with click rate and conversion rate for a fuller picture.

A consistently strong CTOR also signals that your content is resonating with subscribers, which supports long-term customer retention and lifetime value.

Example of CTOR

The click to open rate formula is straightforward:

CTOR = (Unique Clicks ÷ Unique Opens) × 100

If 1,000 people open your email and 150 unique recipients click a link inside, your CTOR is 15%. That means your message engaged 15% of the readers who actually saw it.

Always count unique clicks and unique opens, not total clicks and total opens. Counting the same subscriber multiple times will distort the number.

Driftcharge Tip

Improve CTOR by keeping your emails visually clean, your copy persuasive, and your call-to-action specific and action-driven. Segmenting your list, personalising offers based on past purchase behaviour, and A/B testing subject lines, layouts, and CTAs are among the most reliable ways to lift the metric over time. The same content principles apply across channels, so what you learn from email engagement often translates to SMS marketing and other direct campaigns.

Ganesh Pawar

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Ganesh Pawar is the founder of Driftcharge, a subscription management app designed to help Shopify merchants streamline and scale their subscription businesses. With a deep focus on solving real-world pain points—like legacy account page support, flexible subscription options, and advanced analytics—Ganesh is passionate about building tools that drive growth and retention.