PageRank

Google's foundational algorithm that measures page importance through link relationships

What Is PageRank?

PageRank is Google's original algorithm for measuring the importance of web pages based on the quantity and quality of links pointing to them. Developed by Larry Page and Sergey Brin at Stanford University, this algorithm revolutionised search by treating links as votes of confidence—pages with more high-quality backlinks earned higher authority scores and ranked better in search results.

Whilst Google stopped publicly displaying PageRank scores in 2016, the algorithm still operates behind the scenes as one of many ranking factors. Modern search uses sophisticated variations of the original concept, but the fundamental principle remains: links from authoritative pages transfer value to the pages they link to.

Simple explanation: PageRank is Google's way of measuring how important a web page is by counting and weighing the links pointing to it. Higher-quality backlinks from authoritative sites pass more authority than links from low-quality pages.

Why PageRank Matters

Understanding this algorithm helps inform SEO strategy:

• Link value: Not all backlinks provide equal ranking benefit
• Authority distribution: Links pass authority from one page to another
• Link building focus: Quality matters more than quantity for backlinks
• Internal linking: Strategic internal links distribute authority within sites
• Competitive analysis: Understanding competitor link profiles
• Site architecture: Structure affects how authority flows through pages

Key Takeaway

Whilst PageRank scores are no longer publicly visible, the principles behind the algorithm remain crucial for SEO. Focus on earning links from authoritative, relevant websites rather than accumulating large numbers of low-quality backlinks. Quality trumps quantity—one link from a trusted industry site provides more value than dozens from obscure directories. Use strategic internal linking to distribute authority to your most important pages. Understand that link equity flows through your site based on structure and linking patterns. Modern SEO combines these classic principles with hundreds of additional ranking factors, but authoritative backlinks continue driving rankings.

How PageRank Works

The algorithm calculates page importance through link analysis:

• Link counting: More backlinks generally indicate greater importance
• Link weighting: Links from high-authority pages count more than low-authority ones
• Authority transfer: Pages pass portions of their authority to linked pages
• Damping factor: Not all authority transfers—some "leaks" at each hop
• Iterative calculation: The algorithm runs repeatedly until scores stabilise

Imagine each page starts with equal authority. In round one, that authority distributes across outbound links. In round two, pages accumulate authority from their inbound links and redistribute it. This continues until authority distribution stabilises, revealing which pages have accumulated the most link equity.

PageRank Scale and Scores

Historical context for understanding:

The original public PageRank scores ranged from 0 to 10 on a logarithmic scale. A page with PR5 had exponentially more authority than PR4, not simply one point more. PR7+ indicated extremely authoritative pages—major news sites, universities, and government domains. Most pages scored between PR1-PR4, with PR0 representing new or low-authority pages.

Google removed the public toolbar showing these scores because it encouraged manipulation and misunderstanding. The algorithm still runs internally but without visible scores.

Modern PageRank in SEO

How the principles apply today:

Whilst you can't see PageRank scores anymore, third-party tools offer proxy metrics. Ahrefs uses Domain Rating (DR), Moz uses Domain Authority (DA), and Majestic uses Trust Flow. These metrics attempt to quantify site authority similarly to how PageRank operated, though they're independent calculations not directly tied to Google's internal algorithm.

Focus less on specific numbers and more on relative authority. A backlink from a site with DR70 will typically provide more value than one from DR30, regardless of exact calculations.

Link Quality vs Quantity

Why authority matters more than volume:

Early SEO practitioners discovered they could manipulate PageRank through link schemes—networks of low-quality sites all linking to each other. Google responded with algorithm updates penalising manipulative link building whilst rewarding naturally earned, editorially given links from trusted sources.

Today, one quality link from an authoritative industry publication provides dramatically more value than hundreds of directory submissions or forum signatures. Focus link building efforts on earning links through excellent content, building relationships, and creating genuinely link-worthy resources.

Internal PageRank Distribution

How authority flows within your site:

• Homepage authority: Typically accumulates the most backlinks and highest authority
• Strategic linking: Link from high-authority pages to important target pages
• Site architecture: Shallow structures keep pages closer to authority sources
• Navigation links: Menu items receive authority from every page
• Orphan pages: Pages without internal links receive no internal authority

Smart internal linking distributes accumulated authority strategically, boosting rankings for pages you want to emphasise. Ensure every important page receives internal links from multiple relevant pages.

PageRank Sculpting

The outdated practice of manipulating authority flow:

PageRank sculpting involved using nofollow links strategically to control how authority flowed through sites. By nofollowing certain internal links, webmasters hoped to concentrate authority on priority pages. Google's 2009 update ended this tactic's effectiveness—nofollowing a link now wastes the authority rather than redirecting it.

Modern best practice focuses on natural, logical linking rather than attempting to game authority distribution. Link where it makes sense for users, not to manipulate rankings.

Common Misconceptions

Clarifying misunderstandings about this algorithm:

• "PageRank is dead": The public toolbar disappeared, but the algorithm still operates
• "All links equal": Link quality varies dramatically based on source authority
• "More links always better": Quality matters more than quantity for authority
• "Internal links don't matter": Strategic internal linking significantly impacts rankings
• "Page importance equals rankings": Authority is one factor among hundreds

Alternative Authority Metrics

Third-party tools measuring similar concepts:

Domain Authority (Moz)

Predicts ranking ability on a 0-100 scale based on link profile analysis. Useful for comparing relative authority between sites.

Domain Rating (Ahrefs)

Measures backlink profile strength on a 0-100 logarithmic scale. Updates regularly based on link database changes.

Trust Flow (Majestic)

Evaluates link quality based on proximity to trusted seed sites. Works alongside Citation Flow measuring link quantity.

These metrics provide useful proxies for understanding relative authority but don't represent Google's actual internal calculations.

Building Authority Today

Modern strategies aligned with original principles:

• Create linkable content: Develop resources others naturally want to reference
• Earn editorial links: Build relationships resulting in genuine mentions
• Focus on relevance: Prioritise links from sites in your industry
• Diversify sources: Accumulate links from various authoritative domains
• Avoid manipulation: Never buy links or participate in link schemes
• Internal optimisation: Structure sites logically with strategic internal linking

Related SEO Terms

• Backlinks — Incoming links from other websites
• Link Equity — Value passed through links
• Domain Authority — Moz's authority metric
• Internal Links — Links between pages on your site
• Link Building — Process of earning backlinks

Need Help Building Authority?

Our SEO experts can develop link building strategies and optimise site architecture to build authority and improve rankings.