Domain Authority is a score that predicts how well a website will rank in search results

Domain Authority (DA) is a number from 1 to 100 that estimates how likely a website is to rank highly on Google and other search engines. It is calculated by Moz, a third-party company, based on factors like how many other sites link to you, how authoritative those linking sites are, and how long your domain has existed. A higher score means search engines are more likely to trust your site and show it near the top of results.

Domain Authority is not a Google metric — Google does not publish it or use it directly in their ranking system. Instead, it is a tool built by Moz to help website owners and marketers understand their competitive position. Think of it as a report card that estimates your standing, not the actual grade Google gives you.

The score matters because it affects how hard you have to work to rank for competitive keywords. A site with DA 60 will rank more easily than a site with DA 20, all else being equal. But DA is only one piece of the picture — a site with high authority can still rank poorly if the content does not match what people are searching for.

Key Takeaways

  • Domain Authority ranges from 1 to 100 and is calculated by Moz based on linking patterns, not by Google itself.
  • A "good" DA depends on your industry and competitors — ranking in a niche with low-authority sites requires less DA than ranking in a competitive field.
  • DA grows slowly over time as you earn backlinks from other websites, and there is no shortcut to building it quickly.
  • Domain Authority is useful for comparing your site to competitors, but it should not be your only measure of SEO success.
  • Improving your DA requires creating content people want to link to and building genuine relationships with other site owners in your field.

How Domain Authority is calculated

Moz builds Domain Authority by analyzing the link profile of a website — that is, which other sites link to it and how trustworthy those sites are. The algorithm looks at the total number of backlinks, the quality of the domains those links come from, and how those domains themselves rank. A link from a high-authority site counts for much more than a link from a brand-new blog.

The score also factors in how long your domain has been registered and active. A domain that has existed for ten years with steady growth looks more trustworthy than a domain registered last month, even if both have the same number of links. Moz updates these scores roughly once a month, so your DA may shift slightly from one month to the next as the algorithm processes new linking data.

It is important to understand that Domain Authority is a relative ranking, not an absolute measure. Your DA is meaningful only when compared to your competitors' DA scores. A site with DA 35 might be the strongest in a small local market, or it might be weak in a highly competitive national industry.

What counts as a good Domain Authority for your industry

There is no universal "good" DA score — it depends entirely on what you are competing against. If you run a local plumbing business and your top three competitors have DA scores of 15, 18, and 22, then a DA of 20 puts you in the middle of the pack. If you are trying to rank for a national keyword and your competitors all have DA 50 or higher, then DA 20 will not be enough.

A practical way to find your target is to look at the sites currently ranking on the first page of Google for your main keywords. Check their Domain Authority scores using a tool like Moz's toolbar or a third-party checker. If most of them fall between 30 and 50, that is the range you should aim for. If they are mostly below 25, you may not need to build as much authority.

New sites almost always start with a DA of 1 or not ranked at all. Growing to DA 20 typically takes six months to a year of consistent work. Reaching DA 40 or higher usually requires two to three years of building backlinks and publishing content that other sites want to reference. The higher you go, the slower the growth becomes.

The difference between Domain Authority and Page Authority

Moz also calculates Page Authority (PA), which is similar to DA but applies to individual pages instead of entire domains. A single page on your site might have PA 25 while your overall domain has DA 15, because that one page has earned many high-quality backlinks.

For ranking purposes, both matter. Google ranks individual pages, not domains, so a page with high PA can rank well even if your overall domain authority is low. However, DA is still useful because it reflects the overall trust and strength of your entire site, which affects how easily new pages can rank.

When you are analyzing competitors, check both their domain authority and the page authority of the specific pages ranking for your target keywords. Sometimes a competitor ranks not because their whole site is strong, but because one particular page has earned a lot of links.

How to improve your Domain Authority

The only real way to build Domain Authority is to earn backlinks from other websites. This happens when other site owners find your content valuable enough to link to it, or when you build relationships with people in your industry who are willing to reference your work.

Start by creating content that is worth linking to — detailed guides, original research, tools, or resources that solve real problems. A comprehensive article on a topic your competitors have not covered thoroughly is more likely to earn links than a generic post that repeats what everyone else has said. When you publish something genuinely useful, tell people in your industry about it and ask if they would consider linking to it.

Guest posting on other established websites is another common method. You write an article for someone else's site and include a link back to yours. This works best when the host site has higher authority than yours and when the article genuinely fits their audience. A guest post on a site with DA 40 is worth far more than ten guest posts on sites with DA 5.

Avoid buying links or using link-building services that promise quick results. Google penalizes sites that engage in unnatural linking patterns, and these penalties can tank your rankings far faster than you can build them back up. The safest approach is slow, genuine growth through content and relationships.

Why Domain Authority alone is not enough

A high Domain Authority does not may provide high rankings. A site with DA 70 can still rank below a site with DA 30 if the lower-authority site has better content for the specific search query. Google's ranking system considers hundreds of factors — content quality, page speed, mobile-friendliness, user experience, and relevance all matter alongside authority.

Additionally, Domain Authority can be gamed to some degree. A site that buys thousands of low-quality links might see a temporary DA boost, but Google will eventually catch on and penalize it. Conversely, a site with genuinely good content and real links might have a lower DA than it deserves if Moz's algorithm has not fully processed the data yet.

Use Domain Authority as one data point among many. Track your rankings for actual keywords, monitor your organic traffic, and measure whether your content is reaching the people you want to reach. If your DA is growing but your traffic is flat, something else needs attention. If your traffic is growing but your DA is low, that is fine — you are doing something right.

Tools for checking Domain Authority

Moz offers a free browser toolbar that shows Domain Authority and Page Authority for any site you visit. You can also use their paid Moz Pro subscription, which includes more detailed link analysis and tracking over time. Other third-party tools like Ahrefs, SEMrush, and Majestic also calculate their own authority metrics, though they use different names and methodologies.

For a quick check, the free Moz toolbar is usually enough. For deeper analysis — understanding which sites are linking to you, which links are helping most, and where your competitors are getting their authority — a paid tool becomes useful. Most paid tools offer a free trial, so you can test them before committing.

When comparing your site to competitors, use the same tool for all of them. Different tools calculate authority differently, so mixing Moz scores with Ahrefs scores will give you a distorted picture. Pick one tool and stick with it for consistency.

Frequently Asked Questions

Can I increase my Domain Authority quickly?

No. Domain Authority grows slowly because it is based on backlinks, and earning genuine backlinks takes time. Most sites see meaningful growth only after six months to a year of consistent effort. Any service promising to boost your DA in weeks is either selling low-quality links or misrepresenting what is possible.

Does Domain Authority affect my Google rankings directly?

Google does not use Domain Authority in its ranking algorithm — it is a Moz metric, not a Google metric. However, the factors that build DA (quality backlinks, site age, content quality) do affect Google rankings. So while DA itself is not a ranking factor, the things that build DA are.

What is a bad Domain Authority score?

There is no universal "bad" score, but generally DA below 10 means your site is very new or has very few backlinks. DA 10 to 30 is typical for small businesses and newer sites. DA 30 to 50 is competitive for many industries. DA above 50 is strong and usually requires years of work or an established brand.

Should I focus on Domain Authority or Page Authority?

Focus on Page Authority for the specific pages you want to rank. Build links to those pages and optimize them for your target keywords. As you do this across multiple pages, your overall Domain Authority will grow naturally. Do not chase DA as a number — chase rankings and traffic, and DA will follow.

If my competitor has higher Domain Authority, can I still outrank them?

Yes. A site with lower DA can outrank a higher-DA site if the content is more relevant, better written, or better optimized for the specific search query. Domain Authority is one factor among many. Focus on creating better content than your competitors, and you can win even with lower authority.