Domain Authority: What Is It and How Is It Calculated?
If you’re involved in search engine optimization (SEO), you’ve likely come across the term Domain Authority (DA). It is one of the most popular metrics used to estimate a website’s ability to rank in search engine results. While Domain Authority is not an official Google ranking factor, it serves as a valuable benchmark for evaluating the overall strength of a website and comparing it with competitors.
Understanding what Domain Authority is and how it is calculated can help you build a stronger SEO strategy and improve your website’s online visibility.
What Is Domain Authority?
Domain Authority (DA) is a proprietary SEO metric developed by Moz that predicts how likely a website is to rank on search engine results pages (SERPs). The score ranges from 1 to 100, with higher scores indicating a greater potential to rank for competitive keywords.
For example:
- 1–20: New or recently launched websites.
- 20–40: Growing websites with developing authority.
- 40–60: Established websites with solid SEO performance.
- 60–80: Highly authoritative websites in competitive industries.
- 80–100: Leading global websites such as major news portals and well-known brands.
Rather than measuring absolute quality, Domain Authority compares your website’s strength against other websites within your industry.
Is Domain Authority a Google Ranking Factor?
The simple answer is no.
Google has repeatedly stated that it does not use Domain Authority in its search ranking algorithm. Instead, Google evaluates hundreds of ranking signals such as content quality, backlinks, page experience, relevance, and user satisfaction.
However, because Domain Authority is heavily influenced by many of the same factors that Google values, websites with higher DA often perform better in search rankings. This is why SEO professionals use it as a useful performance indicator rather than a direct ranking signal.
How Is Domain Authority Calculated?
Moz calculates Domain Authority using a sophisticated machine-learning algorithm that analyzes numerous SEO signals. Instead of relying on a single factor, the algorithm evaluates the overall strength and credibility of a website.
Some of the key factors include:
Quality of Backlinks
One of the most important components of Domain Authority is the quality of websites linking to your domain. Backlinks from reputable, authoritative websites carry significantly more value than links from low-quality or spammy websites.
Number of Referring Domains
Having backlinks from many different websites is generally more valuable than receiving hundreds of links from the same domain. A diverse backlink profile demonstrates greater trust and popularity.
Link Relevance
Backlinks from websites within your industry or niche are considered more valuable than unrelated links. Relevant links help establish topical authority.
Website Trustworthiness
Moz evaluates how trustworthy your website appears based on its backlink profile and overall link quality. Websites with fewer spam signals generally receive higher authority scores.
Internal Linking Structure
A well-organized website with logical internal links helps distribute authority across pages and improves crawlability, indirectly supporting Domain Authority.
Overall SEO Performance
Technical SEO, site architecture, page optimization, user experience, and content quality all contribute to the overall authority of a website.
Machine Learning Model
Unlike simple scoring systems, Domain Authority is generated using machine learning. Moz compares millions of websites and analyzes ranking patterns to estimate each site’s ability to compete in search results. As the web evolves, the algorithm is regularly updated, meaning DA scores can change even if your own website remains unchanged.
Why Does Domain Authority Change?
Your Domain Authority score may increase or decrease for several reasons, including:
- Gaining high-quality backlinks.
- Losing valuable backlinks.
- Competitors improving their backlink profiles.
- Algorithm updates by Moz.
- Growth or decline in your website’s overall SEO performance.
- Changes in the size and quality of Moz’s link index.
Because Domain Authority is a comparative metric, fluctuations are normal.
Why Is Domain Authority Important?
Although it is not a Google ranking factor, Domain Authority provides valuable insights for website owners and SEO professionals. It helps you:
- Measure your website’s overall SEO strength.
- Compare your website with competitors.
- Evaluate the success of link-building campaigns.
- Identify opportunities for improvement.
- Assess the credibility of potential backlink sources.
A higher Domain Authority often indicates a stronger and more trusted website.
What Is a Good Domain Authority Score?
There is no universal “good” Domain Authority score because it depends on your industry and competitors.
As a general guideline:
- 10–20: Typical for new websites.
- 20–40: Suitable for small businesses and niche blogs.
- 40–60: Strong authority for established websites.
- 60–80: Excellent authority in competitive markets.
- 80+: Exceptional authority achieved by globally recognized websites.
Rather than chasing a specific number, focus on maintaining a higher DA than your direct competitors.
Can You Improve Domain Authority?
Yes. While Domain Authority cannot be manipulated directly, it naturally improves when you strengthen your website’s SEO.
Effective strategies include:
- Publishing high-quality, original content.
- Earning authoritative backlinks.
- Improving internal linking.
- Fixing technical SEO issues.
- Optimizing on-page SEO.
- Increasing website speed.
- Building topical authority.
- Removing spammy backlinks.
- Creating a positive user experience.
- Maintaining a consistent content publishing schedule.
These improvements enhance your website’s credibility and can gradually lead to a higher Domain Authority score.
Domain Authority is a valuable SEO metric that estimates the overall strength of a website based on factors such as backlink quality, referring domains, technical SEO, and overall site credibility. Although Google does not use Domain Authority as a ranking factor, it remains one of the most trusted benchmarks for comparing websites and tracking SEO progress.
Instead of focusing solely on increasing your DA score, prioritize creating valuable content, earning high-quality backlinks, and providing an excellent user experience. As your website becomes more authoritative and trustworthy, your Domain Authority will naturally improve, supporting stronger search visibility and long-term organic growth.
