Unsubscribe Rate
Unsubscribe rate is the percentage of delivered emails that lead recipients to opt out after receiving a campaign or sequence.
Unsubscribe rate is the share of delivered emails that result in an unsubscribe.
Definition and examples
Unsubscribe rate measures how many recipients choose to stop getting your emails after a campaign, automation step, or newsletter send. The usual formula is simple: unsubscribes divided by delivered emails.
If 5,000 emails are delivered and 25 recipients unsubscribe, the unsubscribe rate is 0.5%. That number does not tell the whole story on its own, but it does tell you when the message, targeting, or sending cadence feels off to the audience.
Why it matters
It matters because unsubscribes are one of the clearest forms of audience feedback. A healthy unsubscribe rate means the wrong people are leaving while the right people stay. A rising unsubscribe rate usually points to a mismatch in expectation, frequency, or relevance.
How should you interpret it?
Look at unsubscribe rate alongside open rate, click-through rate, and the paths people take through your preference center. A spike after one campaign can signal weak targeting. A steady climb across many sends often points to broader positioning or cadence problems.
Common mistakes
A common mistake is treating every unsubscribe as failure. Some unsubscribes are healthy because they remove poor-fit recipients before they become disengaged or hit spam. The real problem is when people feel they have no better option than leaving.
Related terms
Key takeaways
Unsubscribe rate shows what share of delivered emails lead to opt-outs
The metric is most useful when paired with engagement and preference data
Some unsubscribes are healthy, but upward trends usually signal a relevance or cadence issue