An unsubscribe link is the required, clickable mechanism inside every commercial email that lets a recipient opt out of future messages, and unsubscribe rate measures the percentage of recipients who used it following a specific send.
The Formula
The unsubscribe rate formula is:
Unsubscribe Rate = (Unsubscribes ÷ Emails Delivered) × 100
Using delivered emails rather than sent emails in this formula keeps the metric reflecting the audience that actually received the message, rather than being diluted by bounces that never reached an inbox at all.
Unsubscribe Link Requirements
An unsubscribe link isn’t optional design territory, it’s a legal requirement covered under CAN-SPAM Act and CASL elsewhere in this glossary:
- Must be clearly visible, not hidden in tiny text or disguised to discourage clicking.
- Must be processed within a defined window, typically 10 business days under most regulations.
- Increasingly expected to work in one click, following 2024 requirements from Gmail and Yahoo for high-volume senders, rather than requiring a login or multiple confirmation steps.
What Is a Good Unsubscribe Rate
A good unsubscribe rate depends on send type and list, but the unsubscribe rate benchmark data for 2026 gives a reasonably consistent picture:
- Below 0.3 percent per campaign is generally considered healthy, per Klaviyo’s 2026 ecommerce benchmarks.
- The broader ecommerce average sits around 0.27 to 0.31 percent, according to Klaviyo’s State of Email Commerce report covering over 8,500 brands.
- Above 0.5 percent is treated as a critical threshold across most sources, worth investigating immediately.
- Brands sending more than 12 promotional emails a month saw rates climbing as high as 0.48 percent in the same Klaviyo dataset, a clear frequency-related pattern.
Unsubscribe Rate as an Early Warning System
A rising unsubscribe rate tends to be one of the earliest available signals of a frequency or relevance problem, showing up before open rate or click rate visibly decline, since it reflects subscribers taking a deliberate action rather than simply drifting toward passive disengagement.
Related terms:
Adflipr includes a compliant, one-click-ready unsubscribe link in every campaign by default, and tracks unsubscribe rate alongside every other core metric on the analytics dashboard.
