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.
This tool uses industry-standard formulas and calculations to provide accurate results instantly. All calculations happen in your browser — your data never leaves your device, ensuring complete privacy and security.
Whether you're optimizing marketing campaigns, managing finances, or processing data, this tool gives you the precision and speed you need to make informed decisions quickly.
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.