How it works
Fill in the 2 fields above and Email Open Rate Calculator calculates the result instantly, recalculating as you change any value. It applies the formula open rate = opens / delivered × 100. The math runs locally in your browser — nothing is sent to a server.
Formula
open rate = opens / delivered × 100Examples
- Unique opens 1800, Emails delivered 9500 → Open rate: 18.95%
Frequently asked questions
How do I use the Email Open Rate Calculator?
Enter your values in the 2 input fields and the result is calculated automatically as you type. Change any value to see the numbers update instantly.
What formula does the Email Open Rate Calculator use?
It uses open rate = opens / delivered × 100. The calculation is performed in your browser using standard, well-established math for accurate results.
Is my data private?
Yes. The Email Open Rate Calculator runs entirely in your browser. Nothing you enter is uploaded, saved to a server, or shared — it never leaves your device.
Is the Email Open Rate Calculator free?
Yes, it is completely free with no sign-up, no limits and no watermarks. Like every tool on marketing and the rest of the platform, you can use it as often as you like.
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