What is Orphan Page Rate?
Orphan Page Rate is the percentage of a site's pages that have no internal links pointing to them from anywhere else on the site. These pages are hard for both users and search engine crawlers to discover, since neither can navigate to them through the site's normal linking structure.
TL;DR
Orphan Page Rate measures what share of a site's pages have zero internal links pointing to them, making those pages nearly invisible to both users and search engine crawlers.
Formula
Orphan Page Rate = (Number of Pages with No Internal Links Pointing to Them / Total Number of Pages) x 100
Why It Matters
Orphan Page Rate matters because a page that isn't linked to from anywhere else on the site is functionally invisible in normal navigation, even if it's technically live and indexed. Search engine crawlers primarily discover new and updated pages by following links from already-known pages, so an orphaned page is much less likely to be crawled regularly, and even less likely to be found by an actual visitor browsing the site. This commonly happens as a side effect of site redesigns, content migrations, or old pages that were never properly linked into the site's navigation or internal linking structure when they were created. A high orphan page rate often means real content investment is going to waste, since pages that took real effort to create are effectively hidden from the traffic and ranking potential internal linking would otherwise have given them.
Example
A site audit finds that out of 500 total published pages, 45 have zero internal links pointing to them from any other page on the site, often older blog posts that were never linked from newer, related content published later. Orphan Page Rate is 45 divided by 500, times 100, which equals 9%, prompting the SEO team to add internal links from relevant newer pages back to those 45 orphaned pages.
Frequently Asked Questions