Page Authority and Domain Authority are two related but distinct metrics that SEO professionals use to evaluate websites and specific pages. Both come from Moz and use similar methodologies, but they measure different things. Knowing the difference helps you make better decisions about content development, link building, and overall SEO strategy. Many businesses confuse the two or use them interchangeably, missing the specific insights each provides.
For business owners trying to make informed SEO decisions, knowing how Page Authority and Domain Authority differ produces better analysis than treating the metrics as the same thing. The work involves knowing what each metric measures, when each applies, and how to use them together effectively. Strong understanding produces better strategic decisions across various SEO activities.
This guide covers what each metric actually measures, how they differ, and how to use them together appropriately in SEO strategy.
What Domain Authority Measures
Domain Authority, commonly called DA, measures the overall predicted ranking strength of an entire website. The metric considers factors that affect how well the whole domain performs in search results.
The metric uses signals like total backlink profile across the entire site, referring domains, and other domain wide factors. The signals combine through Moz’s machine learning models to produce scores from one to one hundred.
Higher DA scores indicate sites that generally rank well in search results. Lower DA scores indicate sites that struggle to rank against more established competition. The score provides general indication of site authority.
DA scores tend to change slowly because they reflect cumulative domain history. New backlinks affect DA gradually rather than producing immediate jumps. The stability makes DA useful for tracking long term progress rather than short term changes.
The metric applies at the domain level rather than to specific pages. All pages on a site share the same DA. The shared score reflects domain wide authority rather than specific page strength.
What Page Authority Measures
Page Authority, commonly called PA, measures the predicted ranking strength of specific individual pages. The metric considers factors that affect how well that specific page performs in search results.
The metric uses signals like backlinks pointing to the specific page, internal links to the page, and other page specific factors. The signals combine through models similar to DA but applied at the page level.
PA scores can vary significantly across different pages on the same site. A site with substantial DA can have individual pages with relatively low PA when those pages lack their own link support.
The metric provides page level insight that DA cannot match. Some pages on a site rank much better than others. PA helps identify why those differences exist and what specific pages need support.
PA scores respond more quickly to changes than DA. Adding backlinks to a specific page can affect that page’s PA within Moz’s update cycle. The responsiveness makes PA useful for evaluating specific link building campaigns.
How DA & PA Work Together
Several specific ways the two metrics work together in analysis.
Domain Foundation With Page Differentiation
DA provides foundation while PA differentiates specific pages within that foundation. Sites with strong DA can have pages with varying PA based on individual page link support.
The combined view reveals both overall site strength and specific page strength simultaneously.
Identifying Pages That Underperform
Pages with low PA on sites with high DA represent opportunities. These pages have weaker page level support than their domain context suggests they should. Strong implementation identifies these pages and addresses their specific weaknesses.
Identifying Pages That Punch Above Their Weight
Pages with high PA on sites with lower DA suggest content that has earned specific page level authority despite domain limitations. The pattern reveals successful content development approaches worth replicating.
Building Strategy
Domain wide link building affects DA. Page specific link building affects PA. Strong implementation considers both when planning link building campaigns.
Content Prioritization
PA helps prioritize which existing pages need link building support. Pages with weak PA on important topics warrant attention while pages with strong PA already perform well.
Internal Link Strategy
Internal linking distributes both DA influence and PA building. Strong internal linking strategy considers how to direct authority to specific pages that need it.
How DA & PA Differ in Practice
Several practical situations highlight how the metrics differ.
New Site With Strong Specific Page
A new site might have low DA reflecting domain youth but a specific page might earn substantial PA through targeted link building. The page can rank well despite domain limitations.
The pattern shows how page level authority can develop independently from domain authority.
Established Site With Weak Specific Pages
An established site might have high DA but specific pages have weak PA. The page weakness limits those specific pages despite strong domain context.
The pattern shows why high DA does not guarantee that specific pages will rank well.
Same Site Different Page Performance
Different pages on the same site can perform very differently. The DA is identical, but PA varies. The variation explains why some pages rank well while others struggle even within the same domain.
Link Building Impact
Building links to specific pages affects PA more directly than DA. The relationship matters for evaluating specific campaign results.
How to Use DA in Strategy
Several specific ways DA supports strategy.
Competitive Landscape Assessment
DA helps assess the competitive landscape for your industry. Knowing competitor DA scores helps set realistic expectations about what your ranking targets require.
Long Term Progress Tracking
DA tracks long term authority building progress. The slow movement of DA makes it suited for long term tracking rather than monthly variation.
Link Source Evaluation
DA helps evaluate potential link sources. Higher DA sources generally produce more valuable links than lower DA sources. Strong implementation uses DA as one factor in source evaluation.
Domain Wide Strategy Setting
Major decisions about overall domain strategy benefit from DA context. Investing in new sites versus existing sites. Major content investments. Each benefits from DA based analysis.
How to Use PA in Strategy
Several specific ways PA supports strategy.
Content Performance Evaluation
PA reveals which specific pages have developed authority and which have not. The evaluation supports content investment decisions.
Targeted Link Building Prioritization
PA helps prioritize which pages need link building support. Pages with weak PA on important topics warrant priority.
Internal Linking Strategy
PA insights inform internal linking strategy. Directing authority from strong pages to weak pages can improve specific PA scores.
Specific Page Improvement Tracking
PA tracks results of specific page improvement efforts. The page level view supports campaign evaluation.
Common Mistakes With These Metrics
Several patterns produce DA and PA related problems.
Treating DA and PA as interchangeable misses what each metric measures. Strong implementation distinguishes them appropriately.
Focusing only on DA while ignoring PA misses important page level insights. Strong implementation considers both.
Treating either metric as Google ranking authority rather than third party predictive metric misunderstands what they represent.
Setting arbitrary metric goals without ranking goals misses what actually matters. Strong implementation prioritizes ranking outcomes.
Ignoring industry context when interpreting metrics produces misleading conclusions. Strong implementation considers context.
Treating metric updates as site changes when models updated produces confusion. Strong implementation knows what causes score changes.
Pursuing manipulative tactics to game metrics directly produces worse outcomes than legitimate authority building.
How DA & PA Relate to Other Metrics
Several other metrics complement DA and PA.
Domain Rating From Ahrefs
Domain Rating from Ahrefs provides similar function to DA. The two metrics use different methodologies and can produce different scores for the same domains.
Strong implementation considers both metrics rather than relying on either alone.
URL Rating From Ahrefs
URL Rating provides similar function to PA at the page level. The metric uses Ahrefs methodology rather than Moz methodology.
Trust Flow & Citation Flow From Majestic
Majestic metrics consider different aspects of authority. Trust Flow attempts to measure trust signals while Citation Flow measures raw influence.
Authority Score From Semrush
Authority Score from Semrush provides another predictive metric. The methodology differs from Moz approaches.
Combined Use
Strong implementation uses multiple metrics rather than relying on any single source. The combination provides more reliable analysis than single metric reliance.
How to Improve DA
Several practices support DA improvement.
Build Quality Backlinks Across the Site
Quality backlinks anywhere on the site contribute to DA. Strong implementation builds links broadly rather than concentrating only on specific pages.
Increase Referring Domain Diversity
DA considers referring domain count alongside total links. Strong implementation pursues links from diverse sources rather than concentrated patterns.
Maintain Site Quality
DA reflects various quality signals beyond just backlinks. Strong site quality across all dimensions supports DA improvement.
Build Over Time
DA improvement happens gradually. Strong implementation maintains sustained effort rather than expecting quick changes.
Avoid Manipulation
Manipulative tactics can produce short term DA changes that get devalued or reversed. Strong implementation pursues legitimate authority building.
How to Improve PA for Specific Pages
Several practices support PA improvement for specific pages.
Build Backlinks to Specific Pages
Direct backlinks to specific pages affect their PA more directly than general domain backlinks. Strong implementation includes targeted link building for important pages.
Improve Internal Linking to the Page
Internal links from authoritative pages on the site distribute authority to specific target pages. Strong internal linking strategy supports PA building.
Improve Page Content Quality
Better content tends to attract more links over time. Strong page content forms foundation for PA building.
Build Anchor Text Diversity
Diverse anchor text supports natural linking patterns that strengthen PA. Strong implementation maintains natural variation.
Maintain Page Updates
Updated pages tend to maintain and grow authority better than static pages that become outdated.
What This Means for Your Business
If you have been using these metrics in your SEO thinking, several specific actions help.
Distinguish between DA and PA clearly in your analysis.
Use DA for overall site evaluation and PA for specific page evaluation.
Combine these metrics with others from different tools for more reliable analysis.
Focus on actual ranking outcomes rather than treating metrics as goals themselves.
Build authority sustainably through legitimate means rather than pursuing metric manipulation.
Track changes over time to identify what produces actual improvement.
For business owners pursuing serious SEO, understanding both DA and PA enables better strategic decisions than treating either metric in isolation.
Knowing What Each Number Tells You
Page Authority and Domain Authority measure different but related aspects of site strength. Strong understanding of what each measures and how they relate produces better analytical capability than treating them as the same thing.
For business owners, the practical move is to use both metrics appropriately rather than ignoring distinctions between them. The combined view produces insights that either metric alone cannot match while avoiding the confusion that interchangeable use creates.
The SEO professionals who produce strong results consistently usually understand metric distinctions and use each metric appropriately. Match your approach to this analytical discipline, and your SEO decisions benefit from clearer thinking about what specific metrics actually tell you. Take metric distinctions seriously, and your business benefits from analysis that produces better strategic decisions across the SEO work you pursue.