What Is Page Authority In SEO

Page authority is a third-party SEO score, not a Google ranking factor, and treating it as anything else leads to bad decisions. The metric most people mean by the term is Moz’s Page Authority (PA), a page-level score on a 0 to 100 scale that estimates how well a single URL may rank. This guide unpacks where that score comes from, what it actually measures, and when it is worth using.

Moz’s documentation is explicit on the basics: PA is a predictive, page-level metric built mainly from link-based signals, and it exists to help SEOs compare URLs against each other, not to describe Google’s algorithm directly. That single distinction fixes most of the confusion around it.

Where Page Authority Comes From and What It Measures

Moz introduced the metric, which is why it is widely called “Moz Page Authority” in SEO tools and discussion threads. The score sits on a 0 to 100 logarithmic scale, meaning the jump from 20 to 30 is not the same effort as the jump from 60 to 70. Higher scores get harder to earn as they climb.

PA is a predictive model, meaning it estimates ranking potential from observed signals rather than measuring a known search engine behavior. Its main inputs are link-based:

• the quantity of pages linking to the target URL
• the quality and relevance of those linking pages
• the broader link environment around the target URL, including internal support

The exact formula is proprietary, so the score should be read as a relative estimate, not a published ranking equation. Two SEOs can disagree about how much weight each input carries, and both can still use the score sensibly, because PA is useful precisely as a comparison shortcut rather than as a truth source.

Page Authority vs Domain Authority: The Difference That Actually Matters

Domain Authority estimates the ranking strength of an entire domain. Page Authority estimates the strength of a single URL. That is the whole split, and most of the confusion comes from skipping it.

Both scores use a 0 to 100 scale, but they answer different questions. DA answers “how strong is this site?” PA answers “how strong is this page?” A homepage on a well-known publication can carry a DA of 80 while an obscure archive post on the same site sits at a PA of 12, because the archive has few external links and little internal support pointing at it. The site is strong. The page is not.

The reverse happens too. A single piece of research on a smaller site can attract strong, relevant links and outscore the site’s own DA. That page can rank competitively even though the domain around it looks modest. SEOs who care about whether a specific URL can rank should look at PA, not DA, when judging that page alone. A common reference for the contrast is the breakdown of how the two scores diverge in practice.

Agencies like Clickside use this same page-versus-domain split as the starting point for most SEO audits.

What Page Authority Does Not Tell You

It is not a Google ranking factor

Google does not publish or use a score called “Page Authority.” It is a third-party estimate, useful for analysis, but not a description of how Google’s algorithm actually ranks pages. Treating it as a Google signal misreads what the number is doing.

A high score does not guarantee rankings

PA can predict that a page has the link strength to compete. It cannot predict whether the page actually matches what searchers want. Relevance, search intent, and on-page quality still decide whether a page deserves to rank, and a strong score on a misaligned page will not save it.

It does not measure relevance or content quality

Two equally authoritative pages can target very different intents and produce very different results. The score does not know whether your content is shallow, deep, outdated, or the best answer on the web, and it does not try to.

What it misses most:

• how well the page matches the intent behind the query
• how thorough or original the content actually is

A raw number is meaningless without a comparison

There is no universal “good” PA score, because PA only makes sense measured against the pages already ranking for your target query.

How SEOs Actually Use Page Authority

The most common use is competitive comparison. Pull the top 10 URLs ranking for a target keyword, note their PA values, and compare them to the page you want to rank. A big gap tells you that links, content depth, or both need to close before that page has a realistic shot.

PA is also a prioritization tool. Pages with weak scores and high business value are obvious candidates for backlink outreach, internal-link cleanup, or a content refresh. Strong content on a page with no internal support and no external links is a missed opportunity, and the score points straight at it.

Tracking the score over time gives a directional read on whether link-building or internal-link work is moving a page forward. A flat score after months of effort is a signal to change tactics, not to keep grinding the same ones. PA is also useful for spotting orphan or weakly linked pages that look strong in the content audit but are dragged down by poor link support.

The rule that keeps the metric honest: treat it as one input, cross-checked against actual rankings, traffic, and intent match. Useful. Not decisive.

For a hands-on look at your own pages, Clickside’s team runs the same competitive comparison against your live SERPs.

The One Thing to Do With Page Authority Next

Page authority is a third-party, page-level estimate of ranking potential, not a Google ranking factor and not a guarantee. It is a comparison tool that gets sharper the more deliberately you use it.

Pick one priority page, pull the PA of the top 10 URLs ranking for its target keyword, and decide whether the gap is one to close with stronger links, better content, or both. That single comparison will tell you more than any number ever could on its own.