What domain authority is and why it matters

Domain Authority (DA) is a score from 1 to 100 that predicts how well a website will rank in search results. It comes from a company called Moz, and it looks at the quality and quantity of links pointing to a site from other websites. A higher DA usually means search engines trust the site more and will show it higher in results.

DA is useful if you're trying to understand whether a website is established and trustworthy, or if you're building your own site and want to track how your authority grows over time. It's not a perfect measure — a new site with excellent content can still rank well — but it's a quick way to see how a domain compares to competitors.

Key Takeaways

  • Domain Authority is a score from 1 to 100 created by Moz that estimates how well a website will rank in search results.
  • You can check any website's DA for free using the Moz toolbar browser extension or by visiting the Moz Link Explorer tool on their website.
  • DA depends mainly on the number and quality of links from other sites pointing to the domain, not on the site's age or content alone.
  • A DA of 40 or higher is generally considered strong; most new websites start below 20.
  • DA changes over time as a site gains or loses backlinks, so checking it once gives you a snapshot, not a permanent ranking.

Using the Moz toolbar to check DA when ready

The easiest way to check DA is to install the Moz toolbar, a free browser extension that works in Chrome, Firefox, Safari, and Edge. Once installed, it displays the DA score of any website you visit in the top right corner of your browser. You don't have to click anything — the score appears automatically.

To install it, go to moz.com/tools/seo-toolbar, click the button for your browser, and follow the installation steps. After it's installed, visit any website and look for the green Moz icon in your toolbar. Click it to see the DA, along with other metrics like Spam Score and Page Authority (which measures individual pages rather than the whole domain).

The toolbar also shows you the top backlinks pointing to the site you're viewing, which helps you understand why that domain has the authority it does. This is useful if you're researching competitors or deciding whether a site is worth linking to from your own website.

Checking DA without installing software

If you don't want to install an extension, you can check DA directly on Moz's website. Go to linkexplorer.com, type the domain name into the search box, and click the search button. Moz will show you the DA score along with other data like the number of backlinks, referring domains, and spam score.

This method works on any device and doesn't require you to keep software updated. The free version of Link Explorer shows you the main metrics you need. If you want deeper information — like a list of every backlink or historical data showing how DA has changed over months — you would need a paid Moz account, but the free version is enough for a quick check.

The search takes a few seconds because Moz is pulling live data. If the domain is very new or very small, Moz may not have much information about it yet, and the score might be blank or very low.

Understanding what the DA score actually tells you

DA is based almost entirely on backlinks — links from other websites pointing to the domain you're checking. A site with many backlinks from other high-authority sites will have a higher DA than a site with few backlinks or backlinks from low-authority sites. Moz's algorithm also considers whether those backlinks are from relevant topics and whether the linking site itself is trustworthy.

What DA does not measure is the quality of the site's content, how recently it was updated, or how many visitors it gets. A site can have high DA and poor content, or low DA and excellent content. DA is specifically about link popularity, not overall quality.

The scale is not linear — jumping from DA 20 to DA 30 is much harder than jumping from DA 10 to DA 20, because each point requires exponentially more authority. This is why most new websites start with a DA below 10, and reaching DA 40 is considered a real achievement.

How DA changes and what affects it

DA is not permanent. It updates roughly once a month as Moz recrawls the web and discovers new backlinks or lost ones. If a site loses major backlinks — because a linking site went down, removed the link, or was penalized by Google — the DA can drop. If a site gains backlinks from high-authority domains, the DA can rise.

You can't directly control your DA, but you can influence it by earning backlinks. This happens when other websites link to your content because it's useful, newsworthy, or relevant to their readers. Writing original research, creating tools or resources, and building relationships with other site owners are the main ways to earn backlinks naturally.

Buying backlinks or using link schemes to artificially inflate DA is against Google's rules and can result in penalties that actually lower your rankings. Search engines can tell the difference between genuine links and fake ones, so the only sustainable way to build authority is to create content worth linking to.

Comparing DA across websites and industries

DA is most useful when you compare it within the same industry or topic. A news site might have a DA of 70, while a specialized technical blog might have a DA of 35 — but that doesn't mean the blog is worse. The news site has more backlinks because more people link to news, not because its content is higher quality.

When you're researching competitors or deciding whether to link to a site, look at DA as one signal among several. A site with DA 50 that ranks well for your target keywords is more relevant than a site with DA 60 that covers a different topic. Also check whether the site's backlinks come from relevant, trustworthy sources or from spam and low-quality directories.

If you're building your own website, don't obsess over DA in the early months. Focus on creating content that solves real problems for your audience. As your content gets shared and linked to naturally, your DA will grow. Most successful websites took 1 to 2 years to reach DA 20, and that's normal.

Other tools that show similar metrics

Moz is the most widely used source for DA, but other SEO tools show similar authority scores. Ahrefs uses a metric called Domain Rating (DR), SEMrush uses Authority Score, and Majestic uses Trust Flow and Citation Flow. These tools use different algorithms, so the scores won't match exactly, but they all measure roughly the same thing: how many quality backlinks a domain has.

If you're already using one of these tools for other SEO work, you can check authority scores there without installing the Moz toolbar. However, Moz's toolbar remains the fastest free option for a quick check while you're browsing.

Some of these tools offer free versions with limited features, while others require a paid subscription to see detailed backlink data. For a one-time check of a single domain, the free Moz Link Explorer is usually enough.

Frequently Asked Questions

Can I check the DA of my own website?

Yes. Install the Moz toolbar and visit your own domain, or search for it in Link Explorer. Checking your own DA regularly helps you track whether your backlink profile is growing. Most site owners check their DA monthly or quarterly to see if their link-building efforts are working.

What's a good DA score for a new website?

New websites typically start with a DA of 1 to 5. Reaching DA 10 usually takes 3 to 6 months of consistent content and some natural backlinks. DA 20 is solid for a young site, and DA 40 or higher is considered strong. The timeline depends on your industry and how aggressively you build backlinks.

Does DA affect whether Google will rank my site?

DA is Moz's prediction of how well you'll rank, not a Google ranking factor itself. Google uses its own algorithm and doesn't publish a "Domain Authority" score. However, backlinks — which drive DA — are a real Google ranking factor. A site with more quality backlinks usually ranks better, which is why DA tends to correlate with actual rankings.

Why does a website I trust have low DA?

A site can be trustworthy and useful but still have low DA if it's new, specialized, or doesn't attract many backlinks. Academic papers, government resources, and niche informed sites sometimes have low DA because they're not widely linked to, even though they're highly credible. DA measures link popularity, not truthfulness or informed.

Is there a way to increase my DA quickly?

No shortcut exists. DA grows as you earn backlinks from other established websites. The fastest way is to create content that's so useful or original that other sites want to link to it, and to build relationships with other site owners in your field. Buying links or using link schemes will not work and can harm your rankings.