What are Domain Authority and Page Authority?

Navigating the complex landscape of search engine optimization (SEO) often feels like learning a new language. Among the endless acronyms and proprietary scores, two metrics consistently dominate conversations regarding website strength and competitive analysis. If you are refining your digital strategy, you might be asking: What are Domain Authority and Page Authority?

Understanding these metrics is crucial for evaluating your SEO progress, benchmarking against competitors, and identifying high-value link-building opportunities. However, they are also frequently misunderstood. Many marketers mistakenly treat these scores as absolute truths rather than comparative indicators.

In this comprehensive guide, we will break down exactly what these metrics mean, how they are calculated, and why they matter. Furthermore, we will explore practical, proven strategies to improve your scores and drive meaningful organic growth.

What Are Domain Authority and Page Authority?

Domain Authority (DA) and Page Authority (PA) are third-party SEO metrics created by Moz to predict how likely a website or a specific webpage is to rank on search engine results pages (SERPs). Scored on a 1 to 100 logarithmic scale, DA evaluates the ranking potential of an entire domain, while PA evaluates a single page.

Moz introduced Domain Authority in the mid-2000s and has continually refined its machine-learning models to better predict ranking ability. These scores aggregate numerous link-based signals—such as the total number of inbound links and the quality of referring domains—into a single, digestible number.

Crucially, neither DA nor PA are Google ranking factors. They are proprietary calculations designed by an SEO software company to simulate how search engines view your website’s overall trust and credibility. As a result, they should be used as directional compasses rather than definitive grades.

What’s the Difference Between Domain Authority and Page Authority?

While both metrics share a similar scoring model, their scope and application differ significantly. Domain Authority looks at the macro level, whereas Page Authority zooms in on the micro level.

To clarify this distinction, review the comparison table below:

Feature	Domain Authority (DA)	Page Authority (PA)
Definition	Predicts the ranking strength of an entire website.	Predicts the ranking strength of a single, specific URL.
Scope	Site-wide (e.g., yoursite.com).	Page-specific (e.g., yoursite.com/blog-post).
Main Inputs	Total linking root domains and overall backlink profile quality.	Page-specific backlinks, internal links, and content relevance.
Best Use	Benchmarking your brand against industry competitors.	Prioritizing internal linking and page-level optimization.
Example	Assessing if your site can compete with industry giants.	Determining if a new product page can outrank a competitor’s page.

Key differences at a glance

• Breadth vs. Depth: DA measures the cumulative strength of your entire digital property. PA isolates the power of one specific piece of content.
• Volatility: PA is typically more volatile. A single, high-quality backlink from a major publication can drastically spike a page’s PA, while the overall DA remains relatively stable.
• Strategic Application: Use DA to evaluate potential backlink partners. Use PA to identify which of your existing pages need a boost in internal linking.

How DA and PA Affect Each Other

Domain Authority and Page Authority do not exist in vacuums; they share a symbiotic relationship. A website with a massive Domain Authority provides a strong foundation for new content. Consequently, when a high-DA site publishes a brand-new page, that page typically inherits a strong baseline PA, allowing it to rank faster.

Conversely, an exceptional page can lift an entire domain. Consider a real-world example: A highly specialized, well-researched blog post on a newer site (DA 30) goes viral and earns dozens of high-quality backlinks. That specific page might achieve a PA of 65. This high-PA page acts as a powerhouse, funneling authority to the rest of the site through internal links, ultimately pulling the entire Domain Authority upward.

How Domain Authority and Page Authority Are Scored

Both Domain Authority and Page Authority are graded on a 1 to 100 logarithmic scale. This mathematical structure is incredibly important to understand when setting SEO goals for your marketing team.

Because the scale is logarithmic, the difficulty of increasing your score scales exponentially. Moving a brand-new website from a DA of 10 to 20 is relatively simple and can often be achieved with basic directory listings and a few good links. However, growing your score from 70 to 80 requires a monumental effort. The upper echelons of the scale are occupied by digital titans like Wikipedia, Facebook, and major news outlets, which possess millions of inbound links.

To calculate these scores, Moz relies on advanced machine learning algorithms that evaluate dozens of factors against real-world search results. When high-authority sites acquire massive amounts of new links, the algorithm recalculates. As a result, your DA or PA might drop slightly even if you haven’t lost any backlinks, simply because the websites at the very top of the scale raised the curve.

Why DA and PA Matter for SEO

If Google does not use DA or PA to rank websites, why should you care about them? The answer lies in competitive strategy. Search engines keep their exact algorithms a closely guarded secret. Therefore, third-party metrics act as the industry’s best proxy for measuring SEO strength.

Firstly, these metrics are invaluable for competitor benchmarking. If you run an ecommerce store and want to rank for a competitive product keyword, checking the SERPs is your first step. If the first page is dominated by sites with a DA of 80+, and your site has a DA of 25, you know that keyword is currently out of reach. This insight allows you to pivot your Shopify SEO services toward long-tail, lower-competition keywords.

Secondly, DA and PA are essential for prioritizing link-building outreach. When looking for guest posting opportunities or digital PR placements, a site’s Domain Authority helps you gauge the potential value of that backlink. Earning a link from a DA 70 site will move the needle far more than ten links from DA 15 sites.

Finally, these scores provide a tangible way to report on off-page SEO progress. While organic traffic and revenue are the ultimate KPIs, DA and PA offer measurable proof that your site’s overall credibility and trust are growing over time.

What Influences Domain Authority and Page Authority?

While the exact algorithms are proprietary, the core inputs driving DA and PA are well-documented. Link profile quality is the absolute heaviest weighted factor.

Search engines and SEO tools treat backlinks as votes of confidence. However, not all votes are equal. A link from a highly trusted, relevant industry publication passes significantly more authority than a link from a low-quality, spammy directory.

Key factors influencing your scores include:

• Linking Root Domains: The total number of unique websites linking to your domain. Earning one link from 50 different websites is far better than earning 50 links from a single website.
• Backlink Quality: The authority and relevance of the sites linking to you. Tools like Majestic.com use concepts like Citation Flow and Trust Flow to measure this quality.
• Internal Linking Structure: How efficiently authority flows through your own website. A strong internal linking architecture ensures that high-PA pages pass value to lower-PA pages.
• Content Quality: Publishing exceptional content naturally attracts links. For example, a comprehensive Customer Value Optimization guide is highly linkable and serves as a magnet for organic authority.

It is a common misconception that simply publishing more content will increase your DA. Content alone does not move the needle unless it attracts high-quality external links and signals trust to the wider internet.

What Is a Good Domain Authority or Page Authority Score?

One of the most frequent questions from website owners is, “What constitutes a good score?” The truth is, there is no universal benchmark for a “good” Domain Authority or Page Authority.

Because these metrics are comparative, a good score is simply one that is higher than your direct competitors. If you operate a local bakery in a mid-sized town, a DA of 30 might make you the undisputed industry leader in your market. Conversely, if you are launching a new CRM software competing against Salesforce and HubSpot, a DA of 60 might still leave you struggling to reach the first page.

Therefore, you should never evaluate your scores in a vacuum. Analyze the SERPs for your target keywords, record the DA and PA of the top-ranking pages, and use those averages to set realistic, data-driven targets for your own growth.

How to Check and Improve Your DA and PA

Checking your scores is straightforward. You can use free and paid tools like Moz Link Explorer, the MozBar browser extension, or check Moz Pro campaigns if you use their premium suite. Alternatively, other SEO platforms offer comparable metrics, such as Ahrefs’ Domain Rating (DR) and Semrush’s Authority Score.

Once you know where you stand, it is time to get to work. Improving these metrics requires a sustained, strategic effort.

How to improve Domain Authority

Improving your site-wide authority is a marathon, not a sprint. Focus on these core strategies:

1. Conduct a Backlink Audit: Use tools like Ubersuggest or Moz to identify toxic, spammy links pointing to your site. If necessary, use Google’s Disavow Tool to distance your domain from malicious link farms.
2. Earn High-Quality Backlinks: Develop a proactive digital PR and outreach strategy. Create original research, infographics, or expert roundups that naturally incentivize high-authority domains to link back to your site.
3. Fix Technical SEO Issues: A slow, broken, or poorly structured website impedes search engine crawlers. Investing in professional Shopify audit services can help you identify and resolve technical bottlenecks that are dragging down your overall site health.
4. Publish Link-Worthy Content: Shift your focus from generic blog posts to comprehensive, data-driven pillar pages. Content that solves complex problems is inherently more shareable and linkable.

How to improve Page Authority

Because PA is hyper-focused on a single URL, you can often move the needle faster using targeted tactics.

1. Strengthen Internal Linking: Identify the pages on your site with the highest PA. Add natural, contextually relevant internal links from those powerhouse pages to the specific page you want to boost. This funnels existing link equity directly where you need it.
2. Build Page-Specific External Links: When conducting outreach, do not just ask for links to your homepage. Pitch specific, high-value resources or product pages to external publications to drive direct authority to those URLs.
3. Update and Refresh Content: Search engines favor fresh, relevant information. Regularly updating your most important pages with current data, improved formatting, and better media keeps them competitive and encourages new backlinks.

If executing these technical and strategic tasks feels overwhelming, it may be time to hire shopify agency experts who can build and execute a tailored authority-building roadmap for your brand.

FAQ: Domain Authority and Page Authority

Conclusion

Mastering the nuances of SEO metrics is essential for long-term digital success. When you ask, “What are Domain Authority and Page Authority?”, you are ultimately asking how to measure your website’s digital reputation.

Remember that Domain Authority measures the broad strength of your entire site, while Page Authority highlights the specific power of individual pages. Both are scored on a logarithmic scale, meaning early gains are easy, but top-tier growth requires serious investment. Most importantly, these metrics are comparative tools, not absolute ranking factors. Use them to benchmark against competitors, identify link gaps, and track the ROI of your digital PR efforts.

By consistently creating exceptional content, earning high-quality backlinks, and optimizing your internal site architecture, you will naturally increase your authority scores. Stop chasing vanity metrics and start building a genuinely authoritative brand that search engines—and users—can trust.

While it’s hard to boost your DA or PA directly, there are a few ways you can improve it.

Step 1: Remove Low-Quality Backlinks

Sometimes, removing obstacles is more important than creating new paths. Why go through all the work of building a new road when you can simply plow the snow off the one that already exists?

While having more backlinks is typically a good thing, getting those links through link schemes or low-quality sites can do more harm than good.

To start clearing up your site’s rep, start by looking through what Google officially considers a link scheme.

Use a tool like Ubersuggest to go through your links and remove any that reek of a link scheme. Generally, any link from a site with a DA of 40+ is ok, but you’ll want to pay closer attention to sites with a DA lower than that.

Step 2: Create Great Content and Grow Your Link Profile

Creating great content that people want to read and share is the single best thing you can do for your DA and PA scores.

Remember, Google’s algorithm is constantly trying to get better at anticipating what real, living, breathing people want to read. If you focus too much on metrics, you’ll always be lagging behind the latest update.

Instead, focus on creating solid content and let the rest follow. Sure, it’s important to include keywords and optimize your on-page SEO, but focusing entirely on numbers is a fool’s errand. Create great content, and you’ll see that webpages will naturally want to link to you.

Domain Authority and Page Authority: Key Takeaways

Domain Authority and Page Authority scores are useful indicators of how well your site will rank in the SERPs, but they need to be viewed in the context of your particular business and industry.

Businesses should strive to create unique, original, and compelling content that naturally attracts readers. DA and PA can provide insight into how well you’re reaching this goal.

Overall, it’s important to remember that DA and PA are relative rankings. Don’t strive for perfection — just try to get a score that’s higher than your competitors.