It tells you how a vendor's crawler sees your link profile, and nothing more. Page Authority is Moz's prediction of ranking strength from links alone, in the way Ahrefs publishes Domain Rating and Semrush publishes Authority Score. Google does not read any of them.
Where does the score come from?
From a third-party link graph. Each vendor crawls the web, builds its own index of links, and runs a model over it to produce a number on a hundred-point scale, usually logarithmic so the top is crowded and hard to climb.
Two consequences follow from that. The score is only as complete as that vendor's crawl, so a page with links from sites the crawler visits rarely scores lower than its real position justifies. And because each vendor models differently, the same page carries three different authority numbers at once. None is wrong; they are answers to slightly different questions.
Does Google use these numbers?
No. Google ranks with its own signals and has said repeatedly that it does not consume third-party metrics. The public PageRank toolbar score was retired in 2016, and nothing replaced it.
This is the distinction that saves the most wasted effort. An authority score is a competitor's model of the thing Google does privately, so a gap between your score and your ranking is not an error to be fixed. It is the model disagreeing with reality, and reality is the result page.
An authority score is a relative measure for comparing pages inside one tool's index. Treat it as a comparison instrument, never as a scoreboard or a target.
What is the score genuinely good for?
Fast relative judgments where you have no better data. It is useful precisely where ranking data is unavailable to you: other people's pages.
| Use it for | Not for |
|---|---|
| Sorting a long list of link prospects | Deciding whether a page is worth keeping |
| Spotting an unusually strong competitor page | Explaining why you rank where you rank |
| Flagging a link profile that looks bought | Setting a quarterly goal |
| Rough triage before a manual review | Reporting progress to a client |
| Comparing two pages in the same tool | Comparing numbers across different tools |
Why do rankings and authority disagree so often?
Because links are one input among many and relevance is the bigger one. A focused page with a modest link profile routinely beats a stronger page that answers a different question.
The usual causes are easy to check. The winning page matches the query more exactly in its title, headings and body. It covers the subject in enough depth that the searcher stops looking. It sits inside a cluster of related pages that reinforce each other, which is what topical authority describes. Or it is simply well linked from inside its own site, which authority scores built from external links do not measure at all.
Setting a Page Authority or Domain Rating target in a strategy document. You are then optimizing a vendor's model, and the vendor can change that model in a release note. Pick an outcome Google reports: positions, clicks, conversions.
What should you measure instead for a single page?
What the page does, not what a model thinks of it. Impressions, average position, clicks and conversions are all available for your own URLs and all describe the real result.
Two internal measures are worth more than any authority score when you are deciding what to fix. First, how many internal links point at the page, and from where: a page nobody links to from your own site is drifting toward being an orphan page, whatever its external profile looks like. Second, whether the page earns anything once it gets a visit, which is a landing page question rather than a link question.
Does a low score mean a page needs links?
Usually not. Most pages that underperform are losing on relevance, internal linking or depth, and links are the most expensive fix to reach for first.
Work the cheap causes in order. Check that the page actually targets the query you think it does, that your own navigation and related content link to it, and that nothing on the page blocks it from competing. Those are on-page SEO fixes you control. Only when the page is clearly the better answer and still loses does an off-page SEO effort become the sensible next investment.
So which number do you take to the meeting?
Open your own position and click data for the page, and bring the authority score only if someone asks who you are up against. If the two numbers disagree, you have a relevance question to answer, not a link gap to buy your way out of.