Email Marketing Metrics Calculator

Every rate on an email report depends on what you divide by. Open, click, unsubscribe, and conversion rates should use delivered emails as the base, because a bounced message never reached an inbox. Bounce rate is the exception: it is a share of what you sent. Platforms mostly agree on this now, but exported spreadsheets and agency decks often do not, which is how a 22 percent open rate becomes a 25 percent one between two slides.

Open rate has been the least reliable number in email since Apple Mail Privacy Protection started pre-loading messages in 2021. On a list with a large Apple Mail share, opens are inflated and the true figure is unknowable from the report alone. Click rate and click-to-open rate are harder to fake. Click rate tells you what share of the list acted; click-to-open rate tells you whether the content converted the attention it got. When opens are high and CTOR is low, the subject line did its job and the body did not.

The number worth carrying into a budget conversation is revenue per email delivered. It rolls open, click, and conversion into one figure that can be multiplied by list size and send frequency to estimate what the channel is worth. Paired with the list growth and sponsorship calculators, it tells you what a subscriber is worth to acquire and what a placement in your newsletter is worth to sell.