Opens as % of delivered emails. The Email Open Rate Calculator takes emails sent, bounced, unique opens and returns open rate plus delivered, bounce rate. Results update as you type, and the formula is shown under the result so you can repeat it in your own spreadsheet.
Marketing metrics are most useful as trends and comparisons between channels. Measure every campaign the same way, over the same period, and judge it against your gross margin rather than against revenue alone. Use the worked example below to check the maths against your own figures.
How the Email Open Rate Calculator works
Open rates are measured against delivered mail, not sent. Since Apple's mail privacy changes inflated opens, treat the figure as directional and lean on clicks.
Worked example
With the example values (emails sent of 20000, bounced of 400, unique opens of 4500), the open rate is 22.96%; delivered 19,600, bounce rate 2%. Change any figure above and the result updates immediately; use Copy results to paste the summary into a note or email.
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Frequently Asked Questions
How is open rate calculated?
open rate = unique opens ÷ delivered emails (sent − bounced).
Which figures do I need?
Emails sent, bounced, unique opens. Take them from the same period and the same set of accounts or reports so the ratio is consistent, and check the example values as a guide to the units expected.
How often should I track this metric?
Weekly for live campaigns, monthly for channel comparisons, and always over the same period for spend and results so the figures line up.
