What is Domain Authority? (DA Score)

Domain Authority is a metric predicting a website's search ranking potential. Learn how DA scores work and their relevance to AI visibility.

A proprietary metric from Moz that predicts how likely a website is to rank in search engine results, scored 1-100.

Domain Authority (DA) measures the overall strength and credibility of a domain based primarily on its backlink profile. Created by Moz in 2010, it's become an industry-standard benchmark for comparing websites, though it's worth noting that Google doesn't use DA as a ranking factor. The score is logarithmic, meaning moving from 20 to 30 is much easier than moving from 70 to 80.

Deep Dive

Domain Authority works by analyzing dozens of factors related to linking root domains and total number of links, then feeding that data through a machine learning model trained against actual Google search results. Moz updates this model regularly to keep predictions aligned with observed ranking patterns. The practical reality: a DA of 40-50 puts you in solid territory for most competitive keywords. Sites like Wikipedia (DA 100), Amazon (DA 96), and major news outlets (DA 90+) represent the ceiling. Most small business sites hover between 10-30, while established industry blogs typically land in the 40-60 range. Here's what many marketers miss: DA is a comparative metric, not an absolute one. Your DA of 35 matters less than how it stacks up against competitors ranking for your target keywords. If everyone in your space has DA 20-30, your 35 is a significant advantage. If you're competing against DA 70+ sites, you need to win on other factors like content specificity or user intent matching. The signals that build DA - quality backlinks from authoritative sources, diverse referring domains, consistent publication history - also happen to be signals that AI systems use when evaluating source credibility. ChatGPT and Perplexity don't query Moz's API, but they do recognize patterns of authority that DA attempts to measure. Building DA takes time: 6-12 months of consistent link-building typically moves the needle by 10-15 points for newer sites. Quick gains usually indicate spammy tactics that eventually backfire. The most sustainable approach combines high-quality content that naturally attracts links with strategic outreach to relevant publications in your space.

Why It Matters

Domain Authority serves as a quick health check for your site's competitive position. When pitching guest posts, negotiating partnerships, or evaluating link-building opportunities, DA provides a common language that everyone in marketing understands. More importantly, the behaviors that build DA - earning genuine backlinks from respected sources, maintaining a clean link profile, publishing consistently valuable content - also build the kind of authority that AI systems recognize. As AI answers increasingly cite sources, sites with strong authority signals (the same ones DA measures) appear more frequently in AI-generated responses. Your DA score is a useful proxy for broader digital credibility.

Key Takeaways

DA is logarithmic - gains get harder as you climb: Moving from DA 20 to 30 requires far less effort than 70 to 80. The scale rewards early gains but demands exponentially more authority at higher levels.

Google doesn't use DA directly as a ranking factor: DA predicts rankings by correlating backlink data with search results, but Google has confirmed they don't use Moz's metric. It's a proxy, not a cause.

Compare DA against competitors, not in absolute terms: A DA of 30 could be excellent or inadequate depending on your vertical. Always benchmark against sites currently ranking for your target keywords.

DA signals correlate with AI source selection: While AI systems don't query DA scores, they evaluate similar authority signals - linking patterns, source diversity, and domain history - when selecting sources to cite.