What is Domain Authority (DA)?

Domain Authority definition and scoring system

Domain Authority is a search engine ranking score developed by Moz that predicts how likely a website is to rank in search engine results pages compared to competitors. The score ranges from 1 to 100. Higher scores show greater potential to rank. Moz created this scoring system after Google removed their famous PageRank metric from public view back in March 2016.

New websites start at a domain authority of 1 and work their way up. Sites like Google or Wikipedia sit close to 100. The scoring system uses a logarithmic scale. This means moving from 20 to 30 is easier than jumping from 70 to 80. Each point becomes harder to gain as you climb higher.

How Domain Authority is calculated

Moz calculates domain authority using a machine learning algorithm that reviews multiple factors and focuses on backlink data. Moz states that if domain A is more likely to appear in a Google SERP than domain B, then domain A’s DA will be higher than domain B’s DA.

The algorithm thinks about over 40 different elements, but several factors carry the most weight:

• Linking root domains: The number of unique websites linking to your site matters more than total link count
• Link quality: The authority of sites linking to you affects your score
• MozRank: Grades your backlink profile from 0-10 and favors fewer links from high-quality domains over many low-quality links
• MozTrust: Measures your proximity to high authority, trusted domains
• Spam score: Reviews how spammy your backlink profile appears

Your DA score fluctuates live since the machine learning algorithm processes new, incoming links continuously.

Domain Authority vs. Google ranking factors

Google does not use Domain Authority as a ranking factor in their algorithm. John Mueller, Google’s Search Advocate, has confirmed that Google doesn’t have anything like a website authority score. Google’s Andrey Lipattsev confirmed in 2016 that backlinks from individual pages are one of Google’s strongest ranking factors, not domain-level scores.

Domain Authority is strictly a Moz-specific metric developed using their own web index. Other SEO platforms have created their own authority metrics: Ahrefs has Domain Rating, Semrush has Authority Score, and Majestic has Flow Metric Scores. Google recognizes none of these tools.

Better Metrics for Evaluating Backlink Quality

Stop chasing domain authority scores. Focus instead on metrics that actually associate with ranking success and traffic generation.

Niche relevance and topical alignment

Relevance stands as the most essential factor when you assess backlinks. Google evaluates contextual relevance at the domain level, not just the page level. A backlink from a high-authority car blog to an organic cosmetics site adds minimal semantic relevance. Search engines may interpret it as unnatural.

A link from a thematically relevant source delivers much more value than high DA links from unrelated sites, even with moderate authority. One relevant backlink can outperform dozens of irrelevant ones. Take a sustainable energy brand that receives backlinks from sites discussing photovoltaics and solar energy. These links will boost topical authority much more than links from gluten-free diet blogs, whatever the quantity.

Organic traffic and user engagement

Quality backlinks originate from websites with steady organic traffic. The ideal threshold is at least 1,000 visitors monthly. Traffic indicates search engines already trust the domain to some degree. Engagement signals add credibility. Time on page, scroll depth, comments and shares demonstrate genuine value.

Pages where visitors spend 3-5 minutes show genuine interest and boost the SEO value of backlinks. Bounce rates below 40% suggest visitors find what they need. Visitors from niche-relevant backlinks spend 3.2x longer on site and view 2.7x more pages per session. They convert at 4.5x higher rates than traffic from generic links.

Referral traffic potential

Referral traffic measures actual clicks coming through a backlink. This gives you a real sense of its effectiveness. The metric demonstrates how much user engagement a link generates. Search engines receive a signal when users click through to your site. Your content meets user expectations.

Link difficulty and editorial standards

Editorial links placed within body content outperform sidebar, footer or comment links. Search engines recognize authenticity when human editors choose to include a link because it improves the article.

Quality of the linking site’s content

A linking page must be indexed in Google. Non-indexed pages pass no value, whatever the metrics. Quality content should be factually accurate and provide genuine value to visitors. Regular refreshes help maintain that quality.

FAQs

Q1. Is Domain Authority a Google ranking factor? No, Domain Authority is not a Google ranking factor. It’s a third-party metric created by Moz that scores websites from 1 to 100. Google has never used DA in their algorithm, and Google’s Search Advocate John Mueller has confirmed that Google doesn’t have anything like a website authority score.

Q2. What makes a good Domain Authority score? DA scores between 40 and 50 are considered relatively strong, while anything above 60-70 represents very tough barriers to break. However, your DA score should be evaluated relative to your competitors rather than as an absolute measure. If most competitors targeting your keywords fall between 35-45, reaching 50 becomes a meaningful benchmark.

Q3. Can Domain Authority be manipulated or faked? Yes, Domain Authority can be easily manipulated. Anyone can artificially inflate a site’s DA to 50+ for as little as $23 to $153 by buying expired domains, building spammy link networks, or using redirect notices from high authority sites. These fake links offer zero SEO value despite impressive DA numbers.

Q4. What metrics should I focus on instead of Domain Authority for backlinks? Focus on niche relevance and topical alignment, organic traffic (ideally at least 1,000 visitors monthly), referral traffic potential, editorial standards of the linking site, and the quality of the linking site’s content. A moderately authoritative link from a thematically relevant source delivers far more value than high DA links from unrelated sites.

Q5. How should I use Domain Authority in my link building strategy? Use DA as a comparative benchmark alongside other quality signals rather than your primary decision factor. Combine it with topical relevance, organic traffic, and editorial quality when evaluating backlinks. Never judge website quality on DA alone, and avoid buying backlinks or sacrificing content quality for quick DA gains.