Understanding Domain Authority

Published January 4, 2026 ยท 9 min read

What is Domain Authority and Why Should You Care?

Let me save you some confusion right away: Domain Authority is not a Google ranking factor. Google does not use it. They have said this repeatedly.

DA is a metric created by Moz to predict how well a website might rank in search results. Scores run from 1 to 100. Higher is better. But it is a prediction based on link data, not an actual ranking signal.

So why do people obsess over it? Because it is useful for comparison. You cannot see Google's internal quality scores, but you can see DA. It gives you a rough benchmark for measuring your site against competitors.

How Domain Authority is Calculated

Moz calculates DA using a machine learning model that correlates link data with actual search rankings. The key inputs include:

Linking Root Domains: The number of unique websites that link to your site. One link from 100 different sites is worth more than 100 links from one site. Diversity signals that multiple sources trust your content. Total Link Count: The raw number of inbound links, though this matters less than linking root domains. Link Quality: Links from high-DA sites pass more value than links from low-DA sites. A single link from a major publication can move your score more than dozens of links from obscure blogs. MozRank: A proprietary score measuring link popularity based on the quantity and quality of incoming links. MozTrust: A score measuring how close your site is to known trusted sources in the link graph. Sites linked to by universities, government domains, and major institutions score higher. Spam Score: Moz penalizes sites that exhibit patterns associated with spam. Too many low-quality links or suspicious anchor text distributions can drag down your DA.

The algorithm produces a logarithmic score. Moving from DA 20 to DA 30 is much easier than moving from DA 60 to DA 70. The higher you go, the harder it becomes to gain points.

Domain Authority vs Page Authority

Moz also publishes Page Authority (PA), which applies to individual URLs rather than entire domains. A single viral blog post might have high PA even on a low-DA site.

When analyzing competitors or link prospects, consider both metrics:

Alternative Authority Metrics

Moz is not the only company measuring website authority. Other tools have their own metrics:

Ahrefs Domain Rating (DR): Similar concept, different calculation. Ahrefs focuses more heavily on linking domains and their DR scores. Majestic Trust Flow and Citation Flow: Two complementary metrics. Trust Flow measures link quality while Citation Flow measures link quantity. Semrush Authority Score: Combines organic traffic, backlink data, and other signals.

These metrics correlate but produce different scores. A site might have DA 45, DR 52, and Trust Flow 38. None of these numbers is wrong; they just use different methodologies.

For consistency, pick one metric and stick with it. Most SEOs default to Moz DA or Ahrefs DR because these tools have the widest adoption.

What is a Good Domain Authority Score?

DA scores are relative, not absolute. A "good" score depends on your niche and competitors.

DA 1-20: New websites, personal blogs, local businesses with minimal link building. DA 21-40: Established small businesses, active bloggers, local news sites. DA 41-60: Popular industry blogs, regional news outlets, well-known brands in their niche. DA 61-80: Major publications, large ecommerce sites, national news outlets. DA 81-100: Global brands, government sites, major universities, sites like Wikipedia and YouTube.

Compare yourself to direct competitors, not to the entire internet. If your competitors average DA 35 and you have DA 40, you are in a strong position. If they average DA 60 and you have DA 25, you have significant ground to cover.

Why DA Fluctuates

Your DA score can change even if you do nothing. Common reasons include:

Moz Index Updates: Moz periodically recrawls the web and updates its link index. New data can shift scores up or down. Algorithm Changes: Moz occasionally updates its DA calculation. Major algorithm changes can cause widespread score shifts. Competitor Activity: DA is a comparative metric. If competitors gain links faster than you, your relative position drops. Lost Links: Websites go offline. Pages get deleted. If sites linking to you disappear, you lose those link signals. Spam Cleanup: If you disavow toxic links or they naturally disappear, your spam score drops and DA may increase.

Do not panic over small DA fluctuations. Look at long-term trends over months, not day-to-day changes.

How to Increase Domain Authority

Improving DA requires building high-quality backlinks over time. There are no shortcuts.

Create Link-Worthy Content: Publish original research, in-depth guides, useful tools, or unique data. Content that provides genuine value attracts links naturally. Guest Posting: Write articles for relevant industry publications. Include a link back to your site in your author bio or within the content where appropriate. Digital PR: Pitch stories to journalists and bloggers. Original data, expert commentary, and newsworthy events can earn coverage and links from high-DA news sites. Broken Link Building: Find broken links on other sites and offer your content as a replacement. Tools like Ahrefs and Semrush can identify these opportunities. Resource Page Outreach: Many sites maintain resource pages linking to helpful content. If your content fits, reach out and suggest an addition. Competitor Link Analysis: Use Ahrefs or Moz to see who links to your competitors. Reach out to those same sites with your own content. Internal Linking: While internal links do not directly increase DA, they distribute authority throughout your site and help search engines discover your content.

What Does Not Increase Domain Authority

Some tactics waste time or actively harm your site:

Buying Links: Paid links violate Google's guidelines. Low-quality paid links often come from spam networks that increase your spam score rather than your DA. Link Exchanges: Reciprocal linking schemes are easily detected and provide minimal value. Directory Submissions: Mass directory submissions used to work. Now they provide negligible value and can look spammy. Comment Spam: Leaving links in blog comments does not build authority. Most comment links are nofollow and ignored. Private Blog Networks (PBNs): Networks of sites created solely for link building. Google actively penalizes these. The short-term gain is not worth the long-term risk.

DA and Your SEO Strategy

Domain Authority should inform your strategy but not dictate it. Here is how to use it effectively:

Benchmarking: Track your DA monthly alongside organic traffic. Rising DA should correlate with rising organic visibility over time. Link Prospecting: When evaluating link opportunities, prefer higher-DA sites. But also consider relevance. A relevant DA 30 site in your industry may be more valuable than an irrelevant DA 50 site. Competitive Analysis: Compare your DA to the top-ranking sites for your target keywords. If they all have DA 60+ and you have DA 25, you need to either build more authority or target less competitive keywords. Setting Expectations: New sites should not expect to rank for competitive terms immediately. DA reflects the accumulated trust and authority that takes years to build.

Focus on the activities that build real value: creating excellent content, earning genuine links, and providing a great user experience. DA will follow as a natural consequence.

Check domain availability and WHOIS data Check domain availability