How to use the Email Open Rate Calculator
- 1. Enter campaign countsEmails sent, bounced, unique opens and unique clicks.
- 2. Add list healthUnsubscribes and spam complaints, if you have them.
- 3. Review the ratesSee each metric and any warnings about list health.
Worked example
A campaign sent to 10,000 addresses had 250 bounces, so 9,750 were delivered. With 2,925 unique opens, the open rate is 2,925 ÷ 9,750 = 30%. 390 unique clicks give a click rate of 4% of delivered emails and a click-to-open rate of 390 ÷ 2,925 = 13.33%. The bounce rate is 250 ÷ 10,000 = 2.5%, above the 2% level the tool flags as a sign the list needs cleaning. 18 unsubscribes (0.185%) and 3 spam complaints (0.031%) are within normal ranges.
Which numbers to trust
- Opens are inflated: Apple Mail Privacy Protection loads images for many users automatically, which registers an open even if nobody read it.
- Clicks are firmer: CTR and CTOR reflect real actions, so judge content and A/B tests by them.
- Spam complaints matter most for delivery: Gmail and Yahoo ask bulk senders to keep complaint rates well below 0.3%, and the tool warns from 0.1%.
- Bounces above about 2% suggest old or bought addresses; remove hard bounces after each send.
All rates use delivered emails as the base except bounce rate, which uses sent; your email platform may define them slightly differently, so compare like with like. Improve opens with the email subject line tester and build better emails with the HTML email template builder.
Frequently asked questions
What is the difference between CTR and CTOR?
CTR divides clicks by delivered emails. CTOR divides clicks by opens, so it shows how persuasive the content was for people who opened.
Unique or total opens?
Use unique opens, so one person opening five times counts once.
Is the Email Open Rate Calculator free?
Yes, the Email Open Rate Calculator is free. The first time you see your first result, you are asked for your name and WhatsApp number once. After that, this and every other Uncodemy tool opens straight away without the form.