Click-to-Open Rate Calculator
Calculate CTOR — clicks divided by opens. Industry benchmark is 10–15%. Free browser-based calculator.
How Click-to-Open Rate Calculator Works
CTOR = (Unique Clicks ÷ Unique Opens) × 100. Unlike CTR (clicks ÷ sends), CTOR isolates email body performance from subject line performance. Campaign Monitor benchmarks CTOR at 10–15% across industries. This metric reveals whether your email content and CTA are compelling to people who already opened the message. Low CTOR despite high opens suggests a content-offer mismatch or weak call-to-action.
Email Click-to-Open Rate Benchmarks
| Label | Meaning |
|---|---|
| Above 15% | Strong — email content and CTA resonating well |
| 10–15% | Average — Campaign Monitor benchmark |
| 5–10% | Below average — review CTA placement and offer relevance |
| Below 5% | Poor — content-offer mismatch or weak CTA |
Frequently Asked Questions
What is CTOR?
Click-to-Open Rate (CTOR) measures the percentage of email openers who also clicked a link. Formula: (Unique Clicks ÷ Unique Opens) × 100. Unlike CTR (which divides clicks by total sends), CTOR isolates content quality from subject line quality — a useful diagnostic split.
CTOR vs CTR — which should I track?
Track both. CTR (clicks ÷ sends) measures overall campaign efficiency. CTOR (clicks ÷ opens) isolates whether your email body is converting people who engaged enough to open it. Low CTOR + high open rate = great subject line, weak body content or CTA.
How do I improve CTOR?
Single focused CTA (not 5 links competing for attention), above-the-fold CTA placement, relevance between subject line promise and email body content, and personalisation beyond first name (segment by behaviour or lifecycle stage).
Is my data stored?
No.
Can I use this on mobile?
Yes.
About This Tool
Built by the Calcyo team and last updated June 2026. All calculations follow industry-standard methodology. No data leaves your browser — calculations run entirely client-side using JavaScript. If you spot an error in the formula or benchmark data, email us at support@calcyo.xyz.