What Is the Relationship Between Domain Authority and Other Metrics Like Page Authority, and How Do They Interact to Affect SEO?


Domain Authority (DA) and Page Authority (PA) are metrics developed by Moz to estimate how well a site will perform in search engine results. Domain Authority predicts the overall ranking potential of an entire domain or subdomain, while Page Authority focuses on the ranking strength of individual pages. Both metrics interact to influence SEO, guiding strategies for improving site rankings through link-building, content quality, and technical SEO improvements.

Understanding Domain Authority (DA)

Domain Authority is a score ranging from 1 to 100 that predicts how likely a domain is to rank in search engine result pages (SERPs). It is calculated by evaluating multiple factors, including the number of total links, linking root domains, and other factors into a single DA score. The higher the DA, the greater the presumed ranking potential of the domain.

DA is a comparative metric, meaning it's most useful as a relative score and not as an absolute measure of quality. It's intended to compare domains and track the "strength" of your website over time relative to others.

Authoritative Source: [Moz, 2023]

Understanding Page Authority (PA)

Page Authority measures the likelihood of a specific page to rank on SERPs. It also scores on a scale from 1 to 100, based on data from the Mozscape web index and includes link counts, MozRank, MozTrust, and dozens of other factors. Like DA, PA is also a comparative metric.

This metric is particularly useful for pinpointing the effectiveness of individual pieces of content and assessing the impact of on-page SEO elements.

Authoritative Source: [Moz, 2023]

Key Differences Between DA and PA

  • Scope: DA applies to entire domains and subdomains, while PA applies to individual pages.
  • Impact: DA influences the overall visibility of the entire site, whereas PA affects the rankings of specific pages.
  • Factors: Both DA and PA consider link quality and quantity, but PA places more emphasis on page-specific factors such as content quality and keyword optimization.

How These Metrics Affect SEO

SEO Strategy and DA

A high Domain Authority can drive the overall visibility of your site, leading to more traffic and better rankings for individual pages. This makes DA an important metric for overall site strategy, guiding decisions on content creation, site structure, and backlink strategies.

Authoritative Source: [Search Engine Journal, 2021]

SEO Strategy and PA

Page Authority helps to focus on optimizing specific pages to rank for targeted keywords. This can include improving on-page SEO elements such as title tags, meta descriptions, and keyword density, as well as building internal and external links to the page.

Authoritative Source: [Search Engine Journal, 2022]

Interplay Between DA and PA

While DA sets the stage for your site's overall ranking potential, the PA of individual pages can provide insights into specific areas that may require optimization. Together, they offer a comprehensive view of where to allocate your SEO efforts.

Examples of Interactions Between DA and PA

Consider a website with high DA but varying PAs across its pages. The homepage might have a high PA due to numerous backlinks and high-quality content, but inner pages could have lower PA scores. In such cases, efforts could be made to improve the internal linking structure to distribute link equity more effectively to these lower-PA pages, thereby improving their rankings.


Both Domain Authority and Page Authority are crucial metrics in SEO, providing insights into the ranking potential of your domain and individual pages. By understanding and leveraging these metrics, you can develop more effective SEO strategies that enhance your site’s visibility and ranking potential.