New: free AI enrichment when you bring your own OpenAI keySee how →

Open rate calculator

Enter what you sent and how many were opened. The result updates as you type.

Count unique opens — one per recipient.
Your open rate —
Enter both numbers

How open rate is calculated

Open rate is the share of sent emails that were opened: unique opens divided by emails sent, times 100.

Read it with care

Apple Mail Privacy Protection loads images automatically, which can count as an open. Use replies and clicks alongside open rate to judge a campaign.

More free tools

Fix deliverability for good

DoReach sets up SPF, DKIM, DMARC and MX when you add a domain, warms up your inboxes, and tests inbox placement before a campaign goes out.

Start free