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Unsubscribe rate is the clearest early warning sign an email program has. It tells you what share of the people you emailed decided the relationship was no longer worth it enough to opt out entirely, which is a stronger signal than a dip in open rate alone. This calculator takes your unsubscribe count and delivered count and returns the rate instantly.
Divide the number of unsubscribes by the number of emails delivered, then multiply by 100. If a campaign delivered to 18,000 inboxes and 45 people opted out, the math is 45 divided by 18,000, times 100, which is 0.25 percent. The calculator also shows how many subscribers remain on the list after the send, which is simply delivered minus unsubscribes.
Most healthy email programs stay well under 0.5 percent per send. Rates that regularly sit above roughly 0.5 to 1 percent are usually telling you something specific went off, whether that is sending too often, a shift in content that no longer matches what people signed up for, or a list that was never well targeted to begin with. A single high number after one send is less concerning than a rate that keeps climbing send after send.
Per send, the rate tells you whether a specific email, subject line or offer pushed more people to opt out than usual. Tracked over weeks or months, it tells you whether your list's overall relationship with your brand is getting stronger or weaker, a trend a single send's number cannot show on its own. A short lived spike right after a frequency increase or a big content pivot is often just the list self selecting toward more engaged subscribers, while a slow steady climb with no obvious cause is the pattern worth digging into.
A clean list only matters if enough new, relevant subscribers keep entering it. Request a free SEO audit and we will show you how organic and AI search content can keep that pipeline full.
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