Free Email Open Rate and Click Rate Calculator
Calculate every key email campaign metric from one report: delivery rate, open rate, click rate, click-to-open rate, bounce rate and unsubscribe rate, with notes on what each one means. This free email open rate calculator runs in your browser, with no sign-up.
How to use the email metrics calculator
- Open your campaign report in Mailchimp, Brevo, Zoho or any email tool.
- Enter sent, bounces, unique opens, unique clicks and unsubscribes.
- Read the rates and the notes on what to fix.
Email metric formulas
| Metric | Formula |
|---|---|
| Delivered | Sent - bounces |
| Open rate | Unique opens / delivered x 100 |
| Click rate | Unique clicks / delivered x 100 |
| Click-to-open rate (CTOR) | Unique clicks / unique opens x 100 |
| Bounce rate | Bounces / sent x 100 |
| Unsubscribe rate | Unsubscribes / delivered x 100 |
Which metric to trust
Open rates used to be the main measure, but privacy features now load images automatically for many readers, which counts as an open even if the email was never read. Clicks and conversions are more reliable. Click-to-open rate is useful for judging the content of an email, because it shows how many people who opened it found something worth clicking.
How to improve your numbers
- Test subject lines with our email subject line tester.
- Send only to people who opted in, and clean the list every few months.
- Use one clear call to action per email.
- Tag links with the UTM link builder so you can see email sales in GA4.
More free tools and guides
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Frequently Asked Questions
Is this email metrics calculator free?
Yes. It is free with no sign-up, and your numbers stay in your browser.
How is email open rate calculated?
Divide unique opens by delivered emails, which is emails sent minus bounces, and multiply by 100.
What is the difference between click rate and click-to-open rate?
Click rate compares clicks with all delivered emails. Click-to-open rate compares clicks with only the people who opened the email.
Why are my open rates so high?
Privacy features such as Apple Mail Privacy Protection can register opens automatically, which inflates open rates. Focus on clicks and conversions.