Domain Authority

Domain Authority predicts how likely a domain is to rank well in search results by modeling the relationship between linking patterns and search visibility. The score pulls from a large corpus of search results (millions of keywords ranked across millions of domains) and applies machine learning to identify which backlink features correlate with higher rankings.

Moz doesn't publish the exact algorithm, but the public components include:

• Backlink quantity and quality: number of domains linking to you and the authority of those referring domains
• Root domain diversity: how many distinct domains link to you (vs. internal linking or self-links)
• Link velocity: rate at which new backlinks arrive
• Anchor text relevance: contextual signals in the text surrounding your links
• Link location and prominence: whether links appear in main content or footers

Ahrefs' Domain Rating follows a similar philosophy — measuring linking domain diversity and link quality — but uses different proprietary inputs, so DA and DR rarely match exactly.

DA is not a Google ranking factor. Google's algorithm doesn't read Moz's score and decide how to rank you. What DA actually does is proxy for the backlink profile strength that Google does consider.

In practice:

• For competitive benchmarking: If your domain has a DA of 28 and competitors rank at DA 42+, you have a real backlink gap. DA quantifies that gap and helps justify link-building investment.
• For predicting rankability: Domains with higher DA rank higher on average. The correlation isn't perfect — topic relevance, on-page content, and technical SEO matter hugely — but if two pages are otherwise equal, the one from the higher-DA domain usually wins.
• For backlink prospect qualification: When evaluating link opportunities, preferring DA 30+ over DA 15 is a reasonable heuristic for avoiding low-quality directories and scraped-content farms.
• For tracking progress: Watch your DA trend month-to-month. Rising DA signals your link-building is working and your site is building authority.

But DA is imperfect. A domain can have high DA and low search traffic. A site can rank well in a competitive niche with moderate DA if it has exceptional content and on-page optimization. Use DA as a signal, not a prediction.

Since DA is calculated from backlinks, improving it means acquiring higher-quality backlinks, especially from diverse referring domains.

Tactics that work:

• Earn links from high-DA authority sites (news sites, educational institutions, major publications): one link from a DA 70 site matters far more than ten links from DA 20 directories.
• Focus on root domain diversity: five links from one DA 50 domain is weaker than one link from each of five DA 40+ domains.
• Build topical relevance: a backlink from a site in your industry carries more weight than a random high-DA link.
• Create link-worthy content: guides, tools, and original research attract natural links; thin content doesn't.
• Disavow or repair low-quality links: while Google explicitly ignores the disavow file for ranking (it doesn't help your score), removing spam links prevents DA erosion from association.

DA improves slowly. A typical domain gains 1-3 points per quarter with consistent link-building effort. Expecting DA jumps of 10+ points overnight signals you're chasing shortcuts (PBN networks, paid link schemes), which carry high risk of Google penalties.

Moz's DA is the most widely cited authority metric, but it's not the only one. Understanding the landscape:

• Ahrefs Domain Rating (DR): Direct DA competitor, calculated from Ahrefs' own backlink index. Ranges 0-100 like DA. Often differs from Moz's DA by 5-15 points because the backlink crawl and weighting models differ. Both are useful; track whichever tool you already use.
• Semrush Authority Score: Another proprietary metric (0-100 range), based on Semrush's link data. Less commonly used than DA or DR in the industry.
• Majestic Trust Flow / Citation Flow: Older metrics still used by some agencies, but industry consensus has shifted toward Moz and Ahrefs.
• Google's E-E-A-T: Google's internal relevance and authority model for topics and entities. Not publicly scored, but evident in SERP behavior. Can't be gamed; focus on real expertise, trustworthiness, and content quality instead.

For local SEO specifically, Domain Authority is less predictive than for national/international keywords because local results weight Place ID, review recency, and NAP consistency heavily. A domain with DA 35 can rank in the local pack if citations and on-page optimization are strong. DA remains useful for competitive research but is secondary to citation health.