What Is Page Authority (PA)?

How Page Authority Is Calculated and Influenced

Page Authority (PA) comes from a link-based model that evaluates a page’s relative strength using Moz’s web index signals.

Rather than using fixed inputs, the score is produced by a machine-learning system trained on ranking patterns and link graphs. It weighs factors like linking root domains, link authority, follow or nofollow handling, and overall link profile consistency.

As those link signals shift across Moz’s index, Page Authority (PA) can move even without on-page changes.

How Page Authority Drives SEO Growth

In growth-focused SEO, Page Authority (PA) works as a comparative signal for prioritization. It helps teams judge which URLs are most likely to respond to investment, where to consolidate content, and how to interpret ranking volatility against competitive pages.

Content strategists, technical SEOs, and digital PR teams benefit by using PA to allocate effort across audits, internal linking plans, and outreach targets. When applied well, it sharpens forecasting and reduces wasted work on pages that are structurally unlikely to win.

When Should You Trust PA In Audits?

Page authority shifts from being an interesting score to a practical audit signal when it’s used to compare similar pages competing for the same query set. In real audits, it helps frame link-equity gaps, triage underperforming URLs, and sanity-check why rankings favor certain pages.

During audits, PA is most trustworthy for relative comparisons inside one site or within a tight competitor set, using the same Moz index snapshot. Confidence drops when pages differ heavily by intent, freshness, or on-page relevance, or when recent link gains and losses haven’t been recrawled yet.

FAQs About Page Authority (PA)

Is Page Authority the same as Domain Authority?

No; PA evaluates one URL’s ranking potential, while Domain Authority models the whole domain. A strong domain can still have weak pages.

Can on-page changes raise PA directly?

Not directly; PA is link-signal based. On-page improvements help rankings and earning links, which can indirectly increase PA over time.

Why did my PA drop without changes?

PA is relative to Moz’s index; updates to the web graph, competitors’ link growth, or reprocessed links can shift your score downward.

Should PA guide keyword targeting decisions?

Use PA to gauge competitiveness and prioritize URLs; pair it with SERP intent and topical relevance to avoid chasing keywords misaligned to the page.