PageRank
Google's original 1998 link-based ranking algorithm. Still the foundation of how authority propagates across the web, even though the public Toolbar score was retired in 2016.
Definition
PageRank is the original algorithm Google uses to estimate the importance of a web page based on the quantity and quality of inbound links pointing to it. Patented in 1998 by Larry Page and Sergey Brin (US Patent 6,285,999), PageRank treats the web as a graph where each link is a vote, and votes from higher-PageRank pages count more than votes from lower-PageRank pages.
While Google has long since stopped publishing the Toolbar PageRank score (retired 2016), the underlying logic remains a core component of Google's ranking signals. Modern variants like Reasonable Surfer (US 7,716,225) and Topic-Sensitive PageRank refine the original by weighting links based on click probability and topical relevance.
The original formula
PR(A) = (1-d) + d * (PR(T1)/C(T1) + PR(T2)/C(T2) + ... + PR(Tn)/C(Tn)) Where: d = damping factor (typically 0.85) PR = PageRank of a page C = number of outbound links from that page T1..Tn = pages linking to A
The damping factor models the probability a random surfer continues clicking links rather than jumping to a new page. At 0.85, there is an 85% chance the surfer follows a link and 15% chance they reset. This prevents infinite loops in the calculation and ensures the algorithm converges.
How PageRank flows
Three rules govern PageRank distribution:
- A page divides its PageRank equally across all its outbound links. A DR 50 page with 5 outbound links passes ~10 units to each. The same page with 50 outbound links passes ~1 unit per link.
- Internal and external links draw from the same PageRank pool. If a page links to 4 internal pages and 1 external, each gets 20% of that page's passable PageRank.
- Nofollow links (and rel=ugc / rel=sponsored since 2019) historically did not pass PageRank. After 2019, Google treats these as hints rather than directives - PageRank may flow but the destination gets discounted.
Why PageRank matters in 2026
Google's public position is that "PageRank is one of more than 200 ranking signals." That is technically true but understates its importance. PageRank is the foundation of how authority propagates across the web. Every modern ranking signal that involves "domain authority", "topical authority", or "site quality" is some derivative of graph-based link propagation.
Third-party metrics that proxy PageRank include Ahrefs DR, Majestic Trust Flow, and Moz Domain Authority. None of these are the actual Google PageRank, but they correlate with the underlying graph signal and are useful for relative comparison.
Common misconceptions
| Myth | Reality |
|---|---|
| PageRank is dead (retired 2016) | Only the public Toolbar score was retired. The internal algorithm is alive and active. |
| More links always equal more PageRank | Quality and trust gate the flow. Spammy donor pages pass diluted or zero PageRank. |
| Internal linking does not affect PageRank | Internal links are where most PageRank lives and circulates - external links inject, internal links distribute. |
| Nofollow saves PageRank for other links | Since 2009 PageRank Sculpting was disabled - nofollow does not redirect flow to remaining followed links. |
Related concepts
- Link Equity - the practitioner term for transferable PageRank
- Trust Flow - Majestic's trust-weighted PageRank variant
- Citation Flow - volume-based companion metric to Trust Flow
- Internal Linking Architecture - how to wire PageRank flow inside your site
- Anchor Text Analyzer - audit how anchors signal context to PageRank algorithms
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