Domain Authority (DA) is a score developed by Moz that predicts how well a website will rank on search engine results pages (SERPs), measured on a scale from 1 to 100. DA is not a metric used by Google in determining search rankings. It is a third-party benchmarking tool, most useful when comparing your domain's score against competitors rather than as an absolute measure of performance.
ƒ Domain Authority score (1–100) calculated by Moz using a machine learning model based on link profile signals including linking root domains, total inbound links, and link quality
Why domain authority matters
Domain Authority gives you a quantifiable way to gauge your site's ranking potential relative to competitors. When you monitor your DA score over time, you can identify whether your SEO efforts — link building, content quality, technical improvements — are moving in the right direction.
That said, DA does not guarantee higher rankings. A site with a lower DA can still outrank a higher-DA competitor on specific queries if its content is more relevant or better optimized. Think of DA as a directional signal, not a definitive verdict.
The most practical use of DA is competitive benchmarking: if your DA is lower than your direct competitors', closing that gap becomes a meaningful SEO goal.
How domain authority is calculated
Moz calculates DA using a machine learning model trained against thousands of search results. The model identifies which link-based signals best correlate with actual rankings.
Key factors in the calculation include:
- Linking root domains: The number of unique external domains pointing to your site. Quality matters more than quantity.
- Total inbound links: All links pointing to your domain, weighted by the authority of the linking site.
- Link quality: Links from high-authority, relevant sites carry more weight than links from low-authority or unrelated domains.
- Site structure: A clear, crawlable architecture helps search engines index your content and contributes to overall link equity distribution.
- Content quality: Original, useful content attracts natural backlinks, which strengthens your link profile over time.
Moz's actual algorithm is proprietary and incorporates machine learning techniques that go beyond any simplified formula. The DA score is recalculated regularly as Moz updates its web index, which means scores can fluctuate even if nothing on your site has changed.
What is a good domain authority score?
DA is a relative metric. A score of 40 might be strong in a niche industry with low competition, while the same score could be weak in a highly competitive sector dominated by established publishers.
Rather than targeting a specific number, focus on outscoring your direct competitors. If your top competitors average a DA of 45, aiming for 50 is a more actionable goal than chasing an arbitrary benchmark.
New sites typically start with a DA close to 1. Scores above 60 are generally considered strong; scores above 80 belong to major authoritative domains. Progress takes time, and incremental improvement is normal.
Domain authority vs. page authority vs. website authority
SEO involves multiple metrics, and it helps to understand how DA relates to similar concepts.
Domain authority
DA is a Moz metric focused specifically on the strength of a domain's backlink profile. It predicts ranking potential at the domain level — not for individual pages, and not as a reflection of Google's own ranking signals.
Page authority
Page Authority is also a Moz metric, but it measures the ranking potential of a single page rather than the entire domain. Factors include the quality and quantity of inbound links to that page, the relevance of its content, and on-page SEO signals.
A page can have strong Page Authority even if the domain's overall DA is modest — particularly if that page has attracted high-quality links on its own.
Website authority
Website authority is a broader, less formalized concept. It encompasses factors like content quality, user engagement, site speed, security, and overall reputation — in the eyes of both users and search engines. Unlike DA or Page Authority, website authority is not expressed as a single score. It reflects the cumulative trust and credibility your site has built over time.
Understanding all three helps you prioritize: DA guides competitive strategy, Page Authority guides content and link-building decisions, and website authority reflects the overall user experience you are delivering.
How to improve your domain authority score
DA improves gradually. Consistent effort across several areas compounds over time.
Build a strong backlink profile
Backlinks are the most direct driver of DA. Prioritize acquiring links from domains with strong authority and genuine relevance to your niche. A few high-quality backlinks from credible sources are more valuable than many links from low-authority sites.
Useful tactics include:
- Publishing original research or data that others want to cite
- Guest posting on reputable industry publications
- Earning editorial mentions by producing genuinely useful content
- Monitoring and reclaiming lost backlinks using tools like Moz, Ahrefs, or Google Search Console
Refer to guidance on high-value vs. undesirable backlinks to prioritize your outreach effectively.
Create content worth linking to
High-quality content is the foundation of a strong link profile. Content that answers specific questions, offers original analysis, or solves real problems is far more likely to attract natural backlinks than generic articles.
Updating existing content regularly also signals to search engines that your site is active and relevant — which can support both rankings and DA over time.
Optimize site structure and internal linking
A logical site hierarchy helps search engines crawl and index your content efficiently. Use internal links to connect related pages, distribute link equity across your domain, and guide users to your most important content. Include an XML sitemap and submit it to Google Search Console and Bing Webmaster Tools.
Strengthen technical SEO
Technical SEO improvements do not directly raise DA, but they support the conditions that allow DA to grow. Key areas to address:
- Page speed: Slow-loading pages increase bounce rates and reduce crawl efficiency. Use Google PageSpeed Insights to identify and fix performance issues.
- Mobile optimization: Google uses mobile-first indexing, so a poor mobile experience can suppress rankings and reduce the backlinks your content earns.
- HTTPS and security: Google confirmed HTTPS as a ranking signal in 2014. A secure site also builds user trust, which supports engagement.
- Schema markup: Structured data helps search engines understand your content and can generate rich snippets in SERPs, improving click-through rates.
- Canonical tags: Use canonical tags to consolidate link equity when similar content exists across multiple URLs.
- Robots.txt: Prevent search engines from crawling low-value or duplicate pages, so crawl budget is focused on your most important content.
Use keywords strategically
Incorporate relevant, high-intent keywords into your content, titles, meta descriptions, and image alt text. Well-targeted content ranks for queries your audience is already searching, which increases the likelihood of earning links from high-performing keyword contexts.
Engage on social media
Social signals do not directly influence DA, but sharing content on social platforms increases its visibility. Greater visibility leads to more opportunities for others to discover and link to your content. Engage with your audience, respond to comments, and promote your best content consistently across relevant platforms.
Common challenges in maintaining domain authority
Keeping up with algorithm changes
Search engine algorithms evolve constantly. What drives rankings today may be less effective tomorrow. Stay informed about major updates from Google and Moz, and be prepared to adapt your content and technical strategies accordingly.
Sustaining a healthy backlink profile
Backlinks decay over time. Websites go offline, content gets removed, and links break. Monitor your link building strategy and backlink profile regularly using tools like Moz or Google Search Console. Reach out to restore or replace lost links, and diversify your sources so that losing any single link has minimal impact.
Producing valuable content consistently
Consistently creating content that earns links requires ongoing research, editorial effort, and audience understanding. Content must be accurate, relevant, and genuinely useful — not just keyword-optimized. With the rise of AI-generated content, original analysis and first-hand expertise are increasingly valuable differentiators.
Managing user experience across devices
A poor experience on any device — slow load times, broken layouts, difficult navigation — increases bounce rates and reduces engagement. Both factors can suppress rankings and limit the organic reach that drives link acquisition. Test your site regularly across devices and screen sizes.
Responding to competitor strategies
Competitors are also building links, improving content, and optimizing their sites. Regular competitive analysis helps you identify gaps and respond before rivals pull ahead in DA or rankings.
Protecting against negative SEO
Spammy backlinks, content scraping, and other negative SEO tactics can harm your site's authority. Audit your backlink profile regularly, set up alerts for unusual link activity, and use Google's Disavow Tool to neutralize toxic links if needed.
Using domain authority as part of a broader SEO strategy
DA is a useful compass, not a destination. Use it to benchmark your site against competitors, track the impact of your link-building efforts over time, and prioritize which domains to target for outreach.
Pair DA with metrics like organic search traffic, keyword rankings, and Page Authority to get a complete picture of your SEO performance. A rising DA alongside improving rankings and traffic is a strong signal that your strategy is working.
Focus on the fundamentals: earn high-quality backlinks, publish content worth linking to, and maintain a technically sound, user-friendly site. DA will follow.
