Domain Authority Score: Definition and Calculation

Have you ever wondered why some websites easily land on the first page of Google while others struggle to get noticed? A big part of the answer comes down to something called Domain Authority.

Your website is your digital reputation. The stronger and more trusted your site looks to search engines, the easier it is for your content to rank higher and attract steady traffic.

Today, we’ll break down what domain authority really means, how it works, and what you can do to build a score that grows your business online.

What is Domain Authority?

Domain Authority (DA) is a predictive search engine ranking score developed by Moz that measures how likely a website is to rank on search engine results pages (SERPs). The score operates on a 1 to 100 logarithmic scale, where higher scores correspond to a greater potential for organic search visibility.

This metric is not an official Google ranking factor. Google does not use it when calculating search results, nor does it affect your site directly in Google’s algorithms. Instead, SEO professionals use domain authority in SEO as an analytical metric to predict performance and measure domain strength against rival websites.

How is Domain Authority calculated?

Domain Authority is calculated by evaluating dozens of search signals through a machine-learning model. This algorithm compares a website’s link network against thousands of search results across Google to condense complex data into a single score from 1 to 100.

Here is how the calculation works step by step:

1. Counting unique referring root domains: The algorithm evaluates how many distinct websites link back to yours and where they come from. If there is a site with 50 links from 50 different websites, it will score higher than a site with 500 links coming from one single domain.
2. Assessing total backlink quality: Moz analyzes the authority and trust level of every domain pointing to your site by analysing backlinks.
3. Calculating MozRank and MozTrust: These sub-metrics measure the overall raw strength of your link network and how closely connected your domain is to highly trusted seed sites across the web.
4. Evaluating site structure and technical health: Search index crawlers assess sitewide factors including how easily search bots can crawl your pages, overall site architecture, and content quality across all indexed URLs.
5. Mapping data to a logarithmic scale: Moz processes all collected data points through its machine-learning model and places your site on a 1 to 100 on a logarithmic scale. Because the scale is logarithmic, increasing your score from 20 to 30 requires far less effort than jumping from 70 to 80.

What is considered a good Domain Authority score?

A good Domain Authority score is related to your direct search competitors, meaning a score is good if it is higher than the average score of websites ranking for your target keywords.

There is no single magic number that guarantees success across the entire internet. You do not need a score of 80 or 90 to rank well if the websites competing against you in your industry only have scores between 20 and 30.

To help you understand where your website stands, we can look at how scores generally break down across different stages of web development:

• 1 to 20 (Below Average): This range is typical for brand new websites that have not yet built a backlink network or earned trust from search engines.
• 21 to 40 (Average): Many small businesses and local service websites sit in this category once they establish a basic online presence and gain initial regional links.
• 41 to 60 (Good): This score reflects a mature website with a steady stream of incoming links, quality industry mentions, and consistent search visibility.
• 61 to 80 (Very Good): Established online brands, large publications, and well-known industry leaders operate in this range, making them difficult to outrank without substantial effort.
• 81 to 100 (Excellent): Reserved for global digital platforms, major news outlets, and authority sources like Wikipedia, Apple, or Google that receive millions of natural backlinks.

How can I check my website’s Domain Authority?

You can check your website’s Domain Authority for free by entering your root URL into the Moz Link Explorer tool or installing the MozBar browser extension. These tools scan your domain’s backlink profile and display your DA score from 1 to 100 alongside related metrics like total linking domains and Spam Score.

To get an accurate reading of your site, follow these three simple steps:

1. Go to a trusted metric tool: Visit Moz Link Explorer or use reputable alternative SEO platforms such as Ahrefs (which measures Domain Rating or DR) or Semrush (which calculates Authority Score).
2. Enter your root domain: Type your main URL (for example, yourcompany.com) without adding specific page subfolders or individual article links. Checking the root domain gives you the overall site score rather than a single page rating.
3. Review your link profile data: Look beyond the main DA number. Check your total referring root domains, your top-performing backlinks, and your site’s Spam Score percentage.

How can I improve my Domain Authority?

You can improve your Domain Authority by acquiring high-quality backlinks from relevant websites, creating original content that people want to reference, auditing your link profile to remove spam, and maintaining a fast, technically sound web hosting server.

Increasing your score takes time because you are building digital trust. Here are five practical steps you can take to build domain strength:

1. Earn links from authoritative websites in your niche: Focus on quality over sheer quantity. One contextual link from an established, topically relevant site carries more weight than dozens of links from unrelated web directories.
2. Publish linkable assets: Create comprehensive guides, industry research reports, original infographics, and free tools. Other creators naturally link to content that provides clear data or answers specific questions.
3. Clean up toxic backlinks: Run regular backlink audits to identify spammy or low-quality links pointing to your site. Use Google’s Disavow Tool to tell search engines to ignore links from questionable sites that could raise your Spam Score.
4. Strengthen internal link distribution: Connect your high-authority pages to newer or deeper service pages using relevant anchor text. Internal links pass authority across your domain and help search crawlers discover new content faster.
5. Maintain a reliable, fast technical foundation: Search bots need to crawl your pages quickly without encountering server timeouts or slow response times. Hosting your site on a secure, high-uptime server with proper SSL encryption ensures that search engines can easily access and index your site without technical errors.

How long does it take to increase Domain Authority?

It typically takes anywhere from 3 months to over a year to see a noticeable increase in Domain Authority. Because Moz calculates scores based on periodic index updates and logarithmic growth, changes reflect gradually as search crawlers discover and evaluate your new backlinks.

What are the most common Domain Authority mistakes?

The most common Domain Authority mistakes include buying low-quality backlink packages, treating DA as a direct Google ranking factor, neglecting technical server performance, and comparing your score against websites in completely different industries.

When site owners focus too heavily on raising their DA score, they often fall into traps that can harm their overall search performance. Here are five critical mistakes to avoid:

1. Buying cheap or automated backlink packages: Purchasing hundreds of low-quality links from link farms creates a toxic backlink profile. This raises your Spam Score and risks manual penalties from search engines rather than improving your authority.
2. Treating it as a direct ranking signal: Obsessing over your DA score while ignoring content relevance, user intent, and conversion rates leads to ineffective SEO strategies. It is a third-party benchmark, not a metric used by Google.
3. Neglecting technical infrastructure and indexing: Poor hosting, slow server response times, and unhandled crawling errors prevent search engine bots from discovering and indexing your content.
4. Comparing your score across unrelated industries: A DA of 35 might be top-tier for a niche local service, but low for a national news outlet. Comparing your score to giant media platforms instead of your direct niche competitors sets unrealistic expectations.
5. Ignoring toxic or spammy incoming links: Allowing spam links to accumulate without periodic backlink audits can harm your domain’s credibility over time.

How do indexing issues affect website visibility?

Indexing issues hurt website visibility by keeping your pages out of search engine databases entirely, meaning search engines cannot show your content to users regardless of your Domain Authority or content quality. If a page is not indexed, it cannot rank, earn backlinks, or pass internal link equity across your domain.

Here is how indexing problems impact your search presence:

• Unindexed pages cannot rank: Search engines must crawl and add a URL to their index before it can appear in search results. A page left out of the index remains completely invisible to searchers.
• Wasted link equity: If high-authority pages link to URLs that return crawl errors or status code issues, that link value gets trapped and fails to pass authority to the rest of your site.
• Delayed score updates: Severe crawling or indexing barriers delay how fast new backlinks reflect in your DA score.
• Server instability and crawl budget waste: Slow web hosting servers, frequent downtime, or unhandled 5xx errors force search engine bots to slow down or halt their crawling sessions. This leaves newly published pages unindexed for longer periods.

What is the difference between Domain Authority and Page Authority?

Domain Authority measures the overall predictive ranking strength of an entire domain or subdomain, while Page Authority measures the predictive ranking strength of one single, specific URL.

Both metrics were developed by Moz using the same machine-learning model and 1 to 100 logarithmic scale. However, they serve two distinct analytical purposes when you evaluate your SEO performance:

• Domain Authority: This gives you a big-picture view of your website’s total strength. It factors in sitewide link metrics, referring root domains, and trust signals across your entire domain. You use DA when evaluating if your site can compete against rival brands for competitive primary keywords.
• Page Authority: This zooms in on an individual page. It measures the specific backlink profile pointing to that exact page, as well as the internal link equity passed to it from other pages on your site. You use PA when trying to understand why a specific blog post, landing page, or product page is outranking or underperforming competitor URLs.

Conclusion

Domain Authority is not an absolute score or a direct Google switch. Instead, it serves as an accurate mirror reflecting your website’s digital reputation, backlink strength, and technical health.

To grow a high-authority domain, you need a balance of valuable content, strategic link-building, clean site architecture, and fast, uninterrupted server hosting. Without a secure technical foundation, search bots struggle to crawl your pages, slowing down your organic growth regardless of how many backlinks you earn.