What Is Domain Authority in SEO and Does It Matter?

What Is Domain Authority and Who Created It?

Domain Authority (DA) is a search engine ranking score developed by Moz that predicts how likely a website is to rank in search engine results pages. It uses a scale from 1 to 100, with higher scores indicating a greater likelihood of ranking well for competitive search queries.

Moz created DA as a comparative tool, not an absolute measure of quality. It is designed to help you understand how your website stacks up against competitors in terms of ranking potential. A DA of 45 means nothing on its own. It only becomes useful when you compare it to the DA of sites competing for the same keywords in your market.

DA has become one of the most widely referenced metrics in SEO, partly because Moz was one of the earliest SEO tool providers and the metric is freely available through their toolbar and website. This ubiquity has led to widespread misconceptions about what DA actually represents and how Google uses it. Many Singapore business owners treat DA as a definitive ranking score, which it is not.

Understanding what DA measures, how it is calculated, and what it cannot tell you prevents you from making costly decisions based on a misunderstood metric. Let us break it down properly.

How Is Domain Authority Calculated?

Moz calculates DA using a machine learning model that evaluates multiple factors, with the most significant being:

• Linking root domains. The number of unique websites that link to your domain. More diverse sources of backlinks generally produce a higher DA, as they signal that multiple independent sites consider your content worth referencing.
• Total number of links. The overall count of backlinks pointing to your site, though quality matters considerably more than raw volume. A thousand links from spammy directories carry less weight than ten links from established industry publications.
• MozRank and MozTrust. Moz’s proprietary link quality and trust metrics, which assess the authority and trustworthiness of your linking sites. MozTrust specifically evaluates the distance of your links from known trusted seed sites like government domains and major universities.

The model combines these inputs to generate a prediction of ranking probability. Moz periodically updates the algorithm, which means DA scores can shift even when your actual backlink profile has not changed. This happened notably in 2019 when Moz released DA 2.0, causing widespread score changes across the entire web that had nothing to do with individual sites.

DA is calculated on a logarithmic scale. This means it is much easier to grow your score from 20 to 30 than from 60 to 70. Each point at the higher end of the scale requires exponentially more effort and higher-quality backlinks. For a detailed comparison of how DA differs from Ahrefs’ equivalent metric, see our guide on Domain Rating vs Domain Authority.

Does Google Use Domain Authority as a Ranking Factor?

No. This is the single most important thing to understand about DA. Google does not use Moz’s Domain Authority in its ranking algorithm. Google’s John Mueller has stated this directly on multiple occasions, and Google’s documentation makes no reference to any third-party authority metric.

Google has its own internal methods for evaluating site quality and authority, and these are far more complex and nuanced than any third-party metric can replicate. Google considers content relevance, user experience signals, E-E-A-T factors (experience, expertise, authoritativeness, trustworthiness), page speed, mobile usability, and hundreds of other signals alongside backlink quality.

However, DA does correlate with Google rankings. Sites with higher DA tend to rank better because the backlink factors that boost DA are also factors Google values. The metric tracks an outcome of what Google cares about, even though Google does not use the metric itself. It is a useful proxy, not a direct input.

What Is a Good Domain Authority Score for Singapore Businesses?

There is no universally “good” DA score. What matters is how your DA compares to competitors ranking for your target keywords in the Singapore market. Here is a practical guide:

• DA 1 to 20: New websites or sites with very few backlinks. Most newly launched Singapore businesses start in this range. You can still rank for long-tail, low-competition keywords with strong content and good on-page SEO at this level.
• DA 20 to 40: Small to medium businesses with some link building activity. This is where the majority of Singapore SMEs sit. At this level, you are competitive for local and niche keywords, especially when combined with a strong off-page SEO strategy and quality content.
• DA 40 to 60: Established businesses with active SEO strategies and sustained investment in link building. Competitive for moderately competitive keywords in most Singapore industries. Companies like established law firms, medical groups, and well-known service providers typically operate here.
• DA 60 to 80: Well-known brands and authority sites. These sites dominate competitive keyword spaces and include recognised Singapore brands, major publications, and industry-leading platforms.
• DA 80 to 100: Major global brands, news organisations, and government domains. Sites like gov.sg, NUS, and international platforms like LinkedIn or Wikipedia.

If you are a Singapore business targeting local keywords, a DA of 25 to 40 is often enough to compete effectively, provided your content quality, on-page SEO, and technical foundations are solid. We have helped our 146+ clients rank well across a wide range of DA scores by focusing on the complete picture, not just one metric.

Why Does My Domain Authority Keep Changing?

DA fluctuations are normal and happen for several reasons. Understanding these prevents you from panicking over changes that are outside your control and unrelated to your site’s actual quality.

Algorithm updates. When Moz updates its DA calculation model, scores across the entire web shift simultaneously. Your site may gain or lose points without any change to your backlink profile. Moz communicates major updates through their blog, so keep an eye on announcements when you notice unexpected shifts.

Changes in your backlink profile. Gaining or losing backlinks directly affects your DA. If a high-authority site removes its link to you, your DA may drop. Conversely, earning a link from a DA 70+ publication can push your score up noticeably. This is the one cause of DA changes that you can directly influence.

Changes in competitor profiles. DA is relative to the broader web, not absolute. If many sites in your space gain significant backlinks while yours stays the same, your DA might decrease even though your own profile has not changed. The landscape shifted around you.

Index expansion. As Moz crawls more of the web and adds new sites to its index, the relative distribution of scores adjusts. Your site’s position in that distribution may shift even without any changes to your links. This is particularly common when Moz expands their crawling into new geographic regions or industries.

A drop of two to three points is rarely cause for alarm. Focus on the long-term trend over six to twelve months rather than reacting to short-term fluctuations. Consistent upward movement over quarters confirms your SEO strategy is working.

How to Improve Your Domain Authority in the Singapore Market

Since DA is primarily driven by your backlink profile, improving it requires a sustained focus on earning quality links from relevant, authoritative sources. Here are strategies that work consistently for Singapore businesses:

• Earn backlinks from local authoritative sources. Links from Singapore media outlets (CNA, The Straits Times, The Business Times), government-affiliated sites, industry associations, and established local blogs carry significant weight. A feature article that includes a link to your site is worth more than dozens of directory listings.
• Create content that earns natural links. Original research with Singapore-specific data, comprehensive industry guides, and practical tools that others in your sector find useful naturally attract backlinks. A guide titled “Average Digital Marketing Costs in Singapore 2025” is far more linkable than a generic “Why You Need Digital Marketing” blog post.
• Build genuine industry relationships. Digital PR in Singapore is relationship-driven. Contributing expert commentary to journalists, participating in industry events, and collaborating with complementary businesses all create natural link-earning opportunities that compound over time.
• Audit and clean your existing link profile. Spammy backlinks from link farms, irrelevant directories, and suspicious sites can drag your DA down and potentially harm your Google rankings. Use Moz’s Link Explorer or Google Search Console to identify and disavow toxic links regularly.

Genuine DA improvements take time. Expect three to six months of consistent link building before seeing meaningful movement. Be wary of any service promising rapid DA increases, as these typically use spammy tactics that look good in the short term but result in Google penalties that devastate your organic traffic.

How to Use Domain Authority Effectively in Your SEO Workflow

DA is most useful when you treat it as a benchmarking and prospecting tool rather than a goal in itself. Here is how to integrate it into a practical SEO workflow:

• Competitive analysis. Check the DA of sites ranking on page one for your target keywords. This gives you a rough sense of the backlink strength needed to compete. If the top five results have DA 35 to 45 and you are at DA 20, you know link building must be a significant part of your campaign.
• Link prospecting. When evaluating potential backlink opportunities, prioritise outreach to sites with higher DA scores. A link from a DA 50+ site is worth significantly more effort than one from a DA 10 site. Use DA as a quick filter, but always verify the site’s relevance and traffic quality manually.
• Progress tracking. Monitor your DA monthly as a general indicator of backlink profile health. Pair it with other metrics like organic traffic, keyword rankings, and conversion data for a complete picture. DA alone tells you very little about business impact.
• Content gap analysis. If competitors with similar DA scores rank above you, the gap is likely in content quality, on-page optimisation, or technical SEO rather than backlinks. This helps you focus your efforts on the right improvements rather than pouring resources into link building when the problem lies elsewhere.

At Best Marketing, DA is one of several data points we use to build SEO strategies that generate real business results. Our clients have collectively generated over $33M+ in revenue by focusing on rankings, traffic, and conversions rather than vanity metrics. Book a free strategy session to see where your site stands and what actions will have the biggest impact on your bottom line.

Frequently Asked Questions

Is Domain Authority the same as Google PageRank?

No. Google PageRank was an internal Google metric that measured page-level link authority. Google stopped publicly updating PageRank in 2016, though a version of it still operates internally. Domain Authority is a Moz metric that measures domain-level ranking potential. They are different metrics from different companies measuring different things.

Can I improve my Domain Authority quickly?

Genuine DA improvements take time. Expect three to six months of consistent link building to see meaningful movement. Be wary of any service promising rapid DA increases, as these typically use spammy tactics that can result in Google penalties that damage your rankings and organic traffic.

Should I reject guest post requests based on DA?

DA is one factor to consider, but relevance matters more. A guest post on a highly relevant site with DA 25 in your industry may be more valuable for your rankings than one on an unrelated site with DA 50. Evaluate the site’s audience, content quality, and relevance to your industry alongside its DA score.

Does my Domain Authority affect my Google Ads performance?

No. Domain Authority has no impact on Google Ads. Ad performance is determined by bid strategy, Quality Score, ad relevance, and landing page experience. DA is purely an organic SEO metric and has no bearing on paid search campaigns.