Page Authority vs. Domain Authority: Key SEO Differences Explained
Content Angle: Professional guide and comparative analysis.
🖼 Featured Image
- File Name: da-pa-building-analogy.webp
- Alt Text: Technical architectural drawing of a building representing the relationship between Page Authority and Domain Authority.
- Prompt: Architectural diagram showing a website as a building: the entire building represents Domain Authority while individual floors/rooms represent Page Authority. Taller rooms (higher PA) reach above the DA baseline. Blueprint technical style with blue ink on white grid paper.
Introduction to Search Engine Metrics
When optimizing a website for organic search visibility, metrics play an essential role in guideposts. However, many site owners and marketing beginners get confused by the standard terminology used by major tools. In the Moz API ecosystem, two primary metrics stand at the center of authority evaluation: Domain Authority and Page Authority.
Understanding the difference between these two metrics is not just academic; it directly shapes your keyword targeting, backlink acquisition, and page optimization strategies. If you evaluate link prospects using the wrong metric, or audit your site health without checking page-level signals, you will make decisions based on incomplete data. In this guide, we will break down page authority vs domain authority to help you execute more precise, data-driven SEO campaigns.
Topic Overview: What are PA and DA?
Before comparing the two, let us define what each metric represents, who created them, and how they are calculated.
What is Domain Authority (DA)?
Domain Authority is a search engine ranking score developed by Moz that predicts how likely a website is to rank on search engine results pages (SERPs). DA scores range from 1 to 100, with higher scores corresponding to a greater ability to rank. It is calculated by evaluating multiple factors, including referring domains and total links, into a single score. This metric is relative, meaning a DA of 50 is not an absolute score but a comparative indicator of your site's strength against others in Moz's database.What is Page Authority (PA)?
Page Authority is a comparative metric also developed by Moz that predicts how well a specific page will rank on search engine results pages. Like DA, PA is scored on a logarithmic 100-point scale. The primary difference is that while DA measures the ranking strength of the entire domain or subdomain, PA measures the strength of individual web pages. A website might have a moderate overall domain score, but a single well-structured article on that site might have a very high page score due to its specific link profile.Deep Semantic Coverage: Key Differences and Scoring Logic
To understand the difference, it is helpful to look at how link equity flows through a site and how Moz's machine learning model evaluates these signals.
Logarithmic Scaling
Both metrics use a 100-point logarithmic scale. This means it is significantly easier to grow your score from 20 to 30 than it is to grow it from 70 to 80. The reason for this scaling is to model the search engine results pages, where competing with top-tier domains (like Wikipedia or NYTimes) requires exponentially more link authority.Calculation Factors
DA aggregates link data across the entire root domain. It uses a machine learning algorithm to assess referring domains, link quality, spam signals, and overall link distribution.PA, on the other hand, ignores root domain metrics and focuses entirely on the specific URL's backlink profile. It looks at:
- Internal link flow: How much equity is passed to this page from other pages on your site.
- External link quality: The authority of external sites linking directly to this page.
- Link relevance: The topical overlap of the linking domains.
Because of this calculation model, a page can easily build its own Page Authority independent of the rest of the site if it is targeted by an active outreach campaign.
🖼 Body Image 1
- File Name: da-pa-comparison-cards.webp
- Alt Text: Comparison cards displaying Moz Domain Authority and Page Authority metrics.
- Prompt: Side-by-side metric cards: left card shows "Domain Authority: 54" with a globe icon, right card shows "Page Authority: 38" for a specific URL with a document icon. Both cards show the Moz scoring methodology and what each measures. Clean UI card design.
Practical Application: How to Use Both Metrics in Audits
To audit your website's authority or evaluate competitors, you must know when to look at DA and when to look at PA.
When to Check Domain Authority (DA)
- Evaluating Guest Post Prospects: If you are doing email outreach to earn links, use the Domain Authority Checker to check the general strength of the site. A link from a DA 40 site is generally more valuable than a link from a DA 15 site.
- Competitor Benchmarking: Compare your site's overall DA against your primary niche competitors to see how much authority gap you need to close.
- Domain Flipping: If you are buying expired domains, check DA to evaluate the domain's history and overall power.
When to Check Page Authority (PA)
- Keyword Targeting: If you want to rank for a specific keyword, check the PA of the top 10 search results. If the top results have a low PA (under 25), you can easily outrank them by creating a superior resource, even if the parent domains have high DA.
- Internal Link Mapping: Analyze which pages on your site have the highest PA using a Bulk Domain Authority Checker. You can then link from these high-PA pages to your newer, lower-authority articles to pass PageRank and speed up indexing.
- Link Audits: Identify which specific URLs on your site are attracting the most natural links and analyze why they succeed.
Expanded Context: Can PA Outpace DA?
One of the most common questions is whether a page's PA can exceed its domain's overall DA. The answer is yes.
If you have a site with a general DA of 20, but you publish an original industry study that gets cited by major news outlets (DA 80+), that specific study URL will receive a massive influx of direct, high-authority links. Its Page Authority (PA) might climb to 45 or 50, while the domain's general DA remains at 20 because the rest of your pages lack backlinks.
This discrepancy highlights why page-level optimization is so powerful. You do not need a high domain authority to rank for moderate-difficulty terms if you focus on building page-level authority for your target URLs.
🖼 Body Image 2
- File Name: da-pa-decision-flowchart.webp
- Alt Text: Flowchart displaying when to use Page Authority vs Domain Authority in SEO audits.
- Prompt: Flowchart showing when to use PA vs DA in SEO decision-making: branch paths for "evaluating a link prospect" → check DA, "ranking a specific page" → check PA, "comparing sites overall" → check DA. Decision tree diagram in green/blue tones.
Semantic Comparison
| Metric | Level of Analysis | Best Use Case | Primary Signals | Calculation Method |
|---|---|---|---|---|
| Domain Authority (DA) | Entire Root Domain | Niche benchmarking, outreach prospecting | Aggregated links, referring domains, spam signals | Machine Learning prediction scale (1-100) |
| Page Authority (PA) | Single, Specific URL | Keyword viability, internal linking strategy | Direct backlinks, internal link equity, page spam | Machine Learning prediction scale (1-100) |
Conclusion
Understanding the interplay between page authority and domain authority is a necessity for any search marketer. DA gives you the high-level competitive landscape, while PA gives you the precise page-level metrics needed to win individual search terms. By monitoring both with CheckSEORank's tools, you can optimize your link acquisition and content strategy.
Ready to check your metrics? Paste your URLs into our free DA PA Checker to audit your pages. For mass analysis, use our Bulk DA Checker or offer branded reports with our White Label DA Checker. To audit technical performance, view the SEO Website Checker tool. For a detailed breakdown of Moz vs Semrush metrics, check out Semrush vs Moz.
