Pagerank

Think of PageRank as a voting system with weight. When a page links to another, it casts a vote. But not all votes are equal: the voting page's authority matters, and so does how many votes it casts. For example, if a homepage has a hypothetical PageRank value of 5 and links to five other pages, each receiving page gets roughly 1 unit of equity multiplied by a damping factor of about 0.85. So each link passes 0.85 × (5 ÷ 5) = 0.85 units. That's the "link juice" SEOs talk about, but it's more precise than that. The original formula also includes a random-surfer model: the damping factor represents the probability a user clicks a link rather than types a new URL. In practice, a link from a page with high trust scores and few outbound links passes far more value than a link from a directory with hundreds of links. The whole system is one of hundreds of signals used in [Google Search](/google-search/). You can build a site with perfect internal link equity flow and still lose on content quality or relevance. I've seen SEOs obsess over toolbar scores that Google deprecated in 2016. That public number was a rough logarithmic scale and bore little resemblance to the internal metric. Focus instead on earning links from genuinely useful pages and structuring your internal links so that equity flows to your most important content.

You need to weigh PageRank considerations in three scenarios. First, when building backlinks for [SEO](/seo/). If you have a choice between a link from a homepage with 10 outbound links and a link from a deep article with 200 outbound links, the former passes far more equity. I use Ahrefs or Majestic to estimate the authority of a referring domain and its outlink count, then prioritise links from pages with high trust flow and few external links. Second, during internal linking audits. I run a crawl with Screaming Frog to see which pages are orphaned or have zero internal links. Those pages receive no equity from the site's authority flow. I then add links from high-authority pages (like the homepage or top category pages) to cornerstone content. For example, on one ecommerce site, adding a link from the homepage to the "About Us" page improved its [SEO Ranking](/seo-ranking/) for branded terms within weeks. Third, in competitor analysis. If a competitor outranks you despite weaker content, check their link profile: they may have a single link from Wikipedia or a .edu site that passes disproportionate equity. Your response should be to acquire a similar authoritative link, not to build 50 low-quality links. Also consider site architecture: deep pages suffer from equity dilution through many link hops. A page four clicks from the homepage receives far less PageRank than one two clicks away. That's why flat architecture is one of the [SEO Best Practices](/seo-best-practices/). But note: PageRank is recalculated periodically, and Google has many other systems like topic relevance and user signals that can override link equity.

I made several mistakes early in my [Learn SEO](/learn-seo/) journey. First, I believed the public toolbar PageRank score was the real metric Google used internally. I'd optimise to get a PR5 toolbar score, not realising that score was a rough estimate updated infrequently and completely discontinued in 2016. The internal PageRank is far more granular and recalculated often, but we have no access to it. Second, I assumed all backlinks were equal. I'd buy links from any site with high domain authority without checking how many outbound links that page had. A link from a DA70 homepage with 5 outlinks is worth far more than a link from a DA70 blog post with 300 outlinks. I now check the specific page's outlink count. Third, I ignored the damping factor. I thought equity transfer was 100% minus a small loss. In reality, about 15% of equity is lost at each step due to the damping factor, which represents the probability a user stops clicking. That means a link from a page that is many hops from the homepage loses significant value. I now prioritise links from pages that are themselves well-linked. Fourth, I didn't consider nofollow links. Historically, nofollow links passed no PageRank, but Google later changed to treat them as hints. So they can still contribute to visibility. Finally, I over-focused on PageRank at the expense of content and relevance. The algorithm now includes natural language understanding, user interaction signals, and freshness. PageRank is just one piece. My current [SEO Strategy](/seo-strategy/) rule: get the link equity flow right, then double down on content quality.