What Is Domain Authority? A Complete Guide
Domain Authority (DA) is a proprietary search ranking score created by Moz. It runs on a logarithmic scale from 1 to 100 and attempts to predict how competitive a website will be in organic search engine results pages (SERPs). The higher the score, the stronger the site's link profile and — in theory — the more capable it is of ranking for competitive keywords.
Before going any further, the single most important fact about domain authority is this: it is not a Google ranking factor. Google has confirmed on multiple occasions that it does not use Moz's DA, Ahrefs' Domain Rating, SEMrush's Authority Score, or any equivalent third-party metric in its ranking algorithm. These are vendor-created proxies, not signals that Google's crawlers read or act on directly. Understanding this distinction will save you from chasing a number that has no direct relationship with where Google places your pages.
That said, DA and similar metrics are not meaningless. They correlate with ranking ability because they track the same underlying asset — backlinks from authoritative sources — that Google's own algorithms heavily weight. A site with a DA of 70 usually has a richer, more trusted link profile than a DA-20 site, and that link profile genuinely does influence Google rankings. The metric is a proxy, not a cause. Keep that distinction sharp as you read the rest of this guide.
This guide covers everything you need to know about the DA score: its full definition, how it is calculated, how it compares to rival metrics, what counts as a good score in your industry, how to check it, and — most practically — how to improve domain authority through proven, sustainable strategies.
How Domain Authority Is Calculated
Moz calculates DA using a machine learning model trained against Google's actual search results. The algorithm analyses dozens of signals but the dominant factor is the link profile of the domain. Key inputs include:
- Linking root domains: The number of unique domains that contain at least one link to your site. A thousand links from one domain counts far less than ten links from a hundred different domains. Diversity is critical.
- MozRank: A page-level score inherited from Google's PageRank concept that measures link equity. MozRank flows from linking pages to linked pages. When authoritative pages link to you, they pass more MozRank.
- MozTrust: A trust-distance score. Sites closely connected to known trusted seed sites (government domains, major universities, established media outlets) accumulate higher MozTrust. Spam sites that sit many hops away from trusted seeds score low.
- Link quality signals: Not all links are equal. Moz's algorithm de-weights links from low-quality, spammy, or irrelevant pages. A single editorial link from a respected industry publication can outweigh hundreds of directory listings.
- Spam score of linking sites: Moz's Spam Score metric penalises DA when the linking profile is polluted by suspicious domains. A backlink portfolio filled with link farms, private blog networks (PBNs), or irrelevant foreign directories will actively suppress DA.
Once all signals are processed, the model benchmarks your domain against the strongest sites on the web. Because the scale is logarithmic, moving from DA 20 to DA 30 requires proportionally less effort than moving from DA 70 to DA 80. The top end of the scale is occupied by a small number of globally dominant domains — Google, Facebook, YouTube, Wikipedia — and it is practically impossible for a niche business site to reach DA 90+. This is not a failure; it is simply the mathematical compression of the scale.
Moz recrawls the web continuously and recalculates DA scores on a rolling basis. Because the score is relative to the entire web, your DA can drop even when you are actively building links if the rest of the web grows its link profiles faster than you do. This is one of several reasons why chasing a specific DA number is less useful than focusing on acquiring genuinely good backlinks over time.
Domain Authority vs Domain Rating vs Authority Score: What Is the Difference?
If you use more than one SEO tool you will quickly discover that each vendor has its own version of a site-level authority metric. They are measuring broadly the same thing — link profile strength — but they use different data sets, different algorithms, and different scales. Comparing scores across tools is meaningless. A DA of 45 from Moz does not equal a DR of 45 from Ahrefs.
| Metric | Tool | Scale | Primary Input | Notes |
|---|---|---|---|---|
| Domain Authority (DA) | Moz | 1–100 | Linking root domains + MozRank/MozTrust | The original authority metric; logarithmic scale |
| Domain Rating (DR) | Ahrefs | 0–100 | Number and DR of linking domains | Focuses purely on the link graph; does not factor on-page signals |
| Authority Score (AS) | SEMrush | 0–100 | Backlinks + organic traffic + spam signals | Incorporates estimated organic traffic data alongside links |
| URL Rating (UR) | Ahrefs | 0–100 | Page-level backlinks | Page-level equivalent of DR |
| Page Authority (PA) | Moz | 1–100 | Same as DA but scoped to a single URL | Useful for evaluating individual page strength |
Which metric should you use? Use whichever tool you already pay for consistently. The value of any authority metric is in tracking relative change over time and comparing yourself to competitors in the same tool. Pick one, stick with it, and do not compare raw numbers across platforms.
SEMrush's Authority Score is worth a separate mention because it incorporates estimated organic search traffic alongside link data. This makes it slightly more correlated with actual visibility than a pure link-count metric, but it also makes it harder to interpret in isolation — a site with excellent traffic from social media but few backlinks may score higher than a heavily linked site with thin traffic.
What Is a Good Domain Authority Score?
The most common question about the DA score is: "what number should I be aiming for?" The honest answer is that the target depends entirely on your niche and your competitors, not on any absolute threshold. A DA of 35 can be more than enough to dominate a local plumbing niche. The same score in the financial services or health sector will leave you buried on page five.
With that context, here is a general orientation guide:
| DA Score Range | Assessment | Typical Profile |
|---|---|---|
| 80–100 | World-class | Global media, Wikipedia, major platforms (Google, Amazon, BBC). Essentially unattainable for independent sites. |
| 60–79 | Very strong | Well-established brands, major industry publications, widely-cited news sites. Took years and significant investment to reach. |
| 40–59 | Strong | Established niche authority sites, well-known small-to-medium businesses with active PR and content programmes. Competitive across many keyword categories. |
| 20–39 | Developing | Sites a few years old with a modest but growing backlink portfolio. Competitive for low-to-medium difficulty keywords. Where most independent businesses and blogs sit. |
| 1–19 | Early stage | Brand new domains or very young sites. Expected for any site under 12–18 months old. Not a problem in itself. |
Good DA Scores by Industry
Because DA is relative to the web, industry benchmarks matter. The following are rough averages observed across different verticals. Sites above the industry median are well-positioned; sites significantly below it will need to invest in link building to compete for short-tail keywords.
| Industry / Niche | Typical Competitive DA Range |
|---|---|
| Finance, Insurance, Legal | 45–75 |
| Health, Wellness, Medical | 40–70 |
| E-commerce (general) | 30–60 |
| Technology / SaaS | 40–65 |
| Travel | 35–65 |
| Local services (plumber, dentist, etc.) | 15–35 |
| Niche hobby / interest blogs | 10–40 |
| News and media | 55–85 |
The practical takeaway: before setting a DA target, run your top five competing pages through a DA checker and find the median. That is your real-world benchmark. If you are a DA 25 and your competitors average DA 30, you are close enough to compete on well-executed content. If they average DA 60, you will need either a long-tail keyword strategy or a serious link building investment.
How to Check Domain Authority
Checking your DA score is straightforward. Several tools offer free lookups:
- Moz Link Explorer (moz.com/link-explorer) — the canonical source for DA. The free tier allows a limited number of searches per month. Paid plans unlock full backlink data.
- MozBar — a free Chrome extension that overlays DA and PA scores directly on search results pages. Excellent for quick competitive research without leaving your browser.
- Ahrefs Site Explorer — shows DR alongside detailed backlink data. Industry-standard for link prospecting but requires a paid subscription for meaningful use.
- SEMrush — shows Authority Score alongside a full backlink audit, toxic link detection, and competitive analysis. Free tier is limited but sufficient for a basic check.
- Small SEO Tools / Website SEO Checker — various free third-party checkers pull Moz API data. Useful for quick one-off checks without creating an account.
You should also run a full technical site audit alongside any authority check. A weak technical foundation — slow load times, crawl errors, broken redirects — limits how efficiently link equity is distributed across your site, which in turn suppresses your overall authority score.
How to Improve Domain Authority: 12 Proven Strategies
Improving your DA score is fundamentally about improving your backlink profile. There is no shortcut, no trick, and no update that changes this underlying reality. The following strategies are the ones that consistently produce results for sites willing to invest time and effort in legitimate link building.
1. Earn Editorial Backlinks Through Original Research
Original data is one of the most reliable link magnets available to any site. Run a survey, analyse publicly available data, or compile industry statistics that do not exist anywhere else. When you publish findings that journalists, bloggers, and analysts cannot find elsewhere, they cite you. A single well-promoted research piece can earn dozens of editorial links from high-DA publications. These links carry enormous weight because they are voluntary, contextual, and from trusted sources.
2. Build a Free Tool or Resource
Tools attract links at scale because they provide ongoing utility. Calculators, generators, checklists, and data visualisations sit on your domain and accumulate links passively as people discover and share them. This is a high-effort one-time investment with a compounding return. The RankNibbler site audit tool and other free resources on this site exist partly for this reason.
3. Guest Posting on Relevant Sites
Writing articles for other websites in your niche remains a legitimate and effective link building strategy when done properly. The emphasis is on relevant sites with real editorial standards and genuine traffic. A guest post on a respected industry blog earns a quality backlink and exposes your brand to a new audience. Guest posting on low-quality sites purely to collect links provides minimal DA benefit and can attract a Moz Spam Score penalty if the hosting domains are flagged as suspicious. Learn more in the guide to how to build backlinks.
4. Reclaim Unlinked Brand Mentions
Search for your brand name, product name, or key pieces of content across the web. When you find pages that mention you without linking to you, reach out and ask for the link to be added. These are easy wins because the author has already demonstrated awareness of and goodwill towards your site. Conversion rates on unlinked mention outreach are significantly higher than cold link prospecting.
5. Fix Broken Backlinks (Broken Link Building)
When pages that link to your site return 404 errors, that link equity is lost. Audit your backlink profile regularly using Moz, Ahrefs, or Google Search Console. When you find broken inbound links, contact the linking site to update the URL. You can also flip this strategy outward: find broken external links on high-DA sites in your niche, then offer your content as a replacement resource.
6. Strengthen Your Internal Linking Structure
Internal links do not directly increase DA — DA is an external link metric — but they distribute the link equity your external backlinks deliver across your entire site. A page with strong external links but poor internal linking keeps authority locked in a silo. Map your most authoritative pages and use them to pass equity to pages you want to rank. A thorough site audit will surface orphan pages and weak internal linking patterns.
7. Conduct a Toxic Backlink Audit
Low-quality, spammy, or irrelevant backlinks actively suppress DA because Moz's algorithm penalises link profiles with high spam signals. Run a backlink audit in Moz or SEMrush, identify links with high spam scores, and disavow them through Google Search Console. Cleaning up a toxic link profile does not produce immediate DA gains — Moz needs to recrawl and recalculate — but it removes drag from your score over time.
8. Digital PR and Media Outreach
Proactively placing your brand, research, or expertise in media coverage is one of the fastest ways to earn high-DA backlinks. Respond to journalist queries on platforms like Help a Reporter Out (HARO), build relationships with writers who cover your industry, and issue newsworthy press releases when you have something genuinely worth reporting. A single link from a DA-80 national newspaper is worth more than a hundred directory listings.
9. Publish Comprehensive Pillar Content
Long-form, definitive guides on important topics in your niche earn links because they become reference resources. When you publish the most complete guide on a subject — comprehensive enough that other sites link to it as the authoritative source rather than explaining the topic themselves — links accumulate naturally over months and years. This is a slow strategy but produces some of the most durable, high-quality backlinks available.
10. Optimise On-Page SEO First
A site with technical errors, thin content, and poor structure does not convert visits into links. Before aggressively building external links, ensure your site is technically sound. Fix crawl errors, improve page speed, implement structured data, write compelling meta descriptions, and optimise your content for on-page SEO. Sites that rank and get visited earn links organically. Sites that frustrate users do not. Run a site audit to find and fix technical issues that may be limiting your earning potential.
11. Build Your Social and Community Presence
Social links are nearly always nofollow and do not directly pass link equity. However, social distribution increases the reach of your content, which increases the probability that someone with a website will link to it. Active communities — Reddit, LinkedIn, industry forums — expose your content to the people most likely to reference it editorially. Do not treat social as a link building channel; treat it as a content distribution channel that enables link building.
12. Create Linkable Assets in Formats That Attract Citations
Beyond blog posts and tools, certain asset types attract disproportionate links: original infographics that visualise complex data, video tutorials embedded on authoritative platforms, open-source templates and code libraries, and publicly accessible datasets. Diversifying the types of linkable assets you produce broadens the range of sites that will naturally reference you.
Why Domain Authority Is Not a Google Ranking Factor
This point deserves its own section because it is widely misunderstood, even among experienced marketers. Domain Authority was created by Moz, a private SEO software company. It is a Moz product, trained on Moz's crawl data and calibrated against Moz's interpretation of what correlates with Google rankings. Google has no involvement in its creation, no access to its methodology, and no mechanism by which it could even read a DA score from an external source.
Google's own algorithms measure link authority using PageRank (and numerous successor and supplementary signals). PageRank and DA are conceptually similar in that both assess the quality and quantity of inbound links. But they use completely different data, different models, and different outputs. When Google's John Mueller or Gary Illyes say "we don't use Domain Authority," they are being entirely accurate.
The danger of treating DA as a Google factor is that it encourages proxy optimisation: acquiring links specifically designed to inflate a third-party score rather than acquiring links that reflect genuine editorial endorsement. This behaviour is what link schemes look like in practice, and it is precisely what Google's Penguin update and its successors were designed to identify and discount.
The correct mental model: good links improve DA and improve Google rankings, but they do so through separate mechanisms. Improving DA is a side effect of building a legitimate link profile, not a goal in itself. Focus on earning the links; the score will follow.
Domain Authority and New Websites
Every website starts at DA 1. This is not a problem — it is the mathematical starting point for every domain that has no link profile yet. New sites should expect a DA of 1–10 for their first six to twelve months, and this does not necessarily hinder performance in low-competition niches where competitors are also young and under-linked.
Several myths circulate about new sites and DA:
- Myth: buying an aged domain gives you instant DA. Aged domains can carry existing backlinks and thus existing DA, but those links were earned for different content on a different site. Google evaluates whether the new content on the domain is consistent with the historical link profile. Dramatic content changes often result in the old link equity being discounted.
- Myth: DA increases with site age alone. DA does not increase simply because time passes. It increases only when new backlinks are acquired. A three-year-old site with no link building activity may still sit at DA 5.
- Myth: a new site cannot compete in search. New sites can and do rank well for long-tail keywords, local searches, and queries in low-competition niches. DA is one signal among hundreds. Excellent on-page SEO, fast page speed, and well-targeted content can carry a new site to meaningful traffic before its DA climbs significantly.
The practical advice for new sites: do not obsess over DA in the first year. Focus on publishing strong content, executing solid on-page SEO, getting your technical foundation right with a regular site audit, and gradually building relationships that lead to legitimate backlinks. The DA will climb as a result of doing the right things, not as a target in itself.
Domain Authority Manipulation: Myths and Risks
Because DA is visible and measurable, an entire ecosystem of manipulation attempts has grown around it. Understanding these tactics — and why they fail or backfire — will protect you from wasted spending and potential penalties.
Buying Backlinks
Paid links — where money changes hands in exchange for a followed link — violate Google's Webmaster Guidelines. Moz's algorithm partially catches paid link patterns through spam scoring, but the bigger risk is a Google manual action or algorithmic penalty. Short-term DA gains from bought links are often reversed when Moz's next crawl recalculates. Long-term, a profile full of purchased links is fragile: Google link spam updates systematically devalue them, and a single manual action can remove a site from the index entirely.
Private Blog Networks (PBNs)
PBNs are networks of sites created specifically to pass links to a target domain. They can produce rapid short-term DA improvements because, superficially, they look like diverse referring domains. However, Moz's spam scoring increasingly identifies PBN-like patterns, and Google's algorithms have become sophisticated at detecting footprints in PBN link graphs. Sites caught using PBNs face severe ranking penalties.
Link Exchanges
Reciprocal linking — "I link to you, you link to me" — is a natural occurrence between genuinely related sites. Systematic large-scale link exchanges purely for metric inflation are a link scheme. Google's guidelines explicitly call out "excessive link exchanges" as a violation. Occasional natural reciprocal links between relevant sites are fine; organised swaps at scale are not.
DA Boosting Services
Various services advertise the ability to boost your DA to a specific number within days or weeks. These services almost universally use low-quality mass links from sites that Moz has not yet flagged as spam. The boosts are temporary, the links are worthless for actual ranking, and the risk of a Google penalty is real. Avoid them entirely.
What Actually Works
The consistent pattern across all link building research is that links earned through editorial merit — because someone genuinely found value in your content — outperform manufactured links in every measurable dimension: DA contribution, ranking impact, longevity, and safety from algorithm updates.
Domain Authority vs On-Page SEO: Getting the Balance Right
Domain Authority and on-page SEO are complementary, not competing, investment areas. They address different parts of the ranking equation and a deficiency in either limits overall performance.
On-page SEO covers everything that happens on the page itself: title tags, meta descriptions, heading structure, keyword placement, content quality, internal linking, image optimisation, page speed, structured data, and mobile usability. These are entirely within your control and can be improved immediately. A thorough site audit will surface every actionable on-page issue across your site.
Domain Authority reflects your off-page reputation — the aggregate quality of external links pointing to your domain. This is largely in other people's hands and changes slowly. You influence it through content quality, outreach, and PR, but you cannot unilaterally increase it the way you can fix a missing title tag.
| Factor | On-Page SEO | Domain Authority |
|---|---|---|
| Speed of impact | Days to weeks | Months to years |
| Control | Fully within your control | Depends on third parties linking to you |
| Scope | Individual pages | Entire domain |
| Tools needed | Site audit, keyword research | Backlink analysis, outreach |
| Google relevance | Direct ranking signal | Proxy for link signals Google uses |
| Cost to improve | Time + technical access | Time + content + relationship building |
The optimal sequence for most sites is: fix on-page issues first, then invest in link building. A site with weak on-page SEO will not convert its link equity efficiently. Visitors who arrive, bounce immediately, and do not engage send negative user signals. Content that is poorly structured and thin will not attract natural links regardless of how many outreach emails you send. Get the foundation right with a solid site audit, then pursue the backlinks that will raise your DA.
Conversely, a site with excellent on-page SEO but no authoritative backlinks will plateau quickly. You can rank well for long-tail and low-competition queries on on-page strength alone, but breaking into the top three positions for competitive head terms almost always requires a meaningful link profile. Both levers need to be pulled over time. See also the full SEO glossary for definitions of every term in this guide.
Frequently Asked Questions About Domain Authority
Is Domain Authority the same as PageRank?
No. PageRank is Google's internal metric for measuring the authority of individual pages based on the links they receive. It is not publicly disclosed. Domain Authority is a Moz metric trained to correlate with rankings. They share conceptual DNA — both are based on link graphs — but they are entirely different systems using different data and different algorithms. Google has not published live PageRank scores since 2016.
Why did my Domain Authority drop?
DA drops most commonly because: (1) Moz updated its index or algorithm and recalculated all scores; (2) you lost backlinks (linking pages were removed or went offline); (3) competitors gained links faster than you, shifting your relative position on the scale; (4) Moz identified previously uncrawled spam links in your profile and now factors them into your spam score. Check your backlink profile in Moz Link Explorer to identify which linking root domains were lost before drawing conclusions.
Can I have a low DA and still rank on Google?
Yes, absolutely. Many low-DA sites rank on page one for long-tail keywords, local searches, and queries where all competing pages also have modest authority. Google evaluates relevance, content quality, user experience, and dozens of other factors alongside link authority. A DA-15 local business with excellent on-page SEO and genuine customer reviews can outrank larger, higher-DA competitors for local intent queries.
How long does it take to improve Domain Authority?
Significant DA improvements — moving five to ten points — typically take six to eighteen months of consistent link building activity. The timeline depends heavily on your starting point, your industry, the quality of links you acquire, and the cadence of Moz's recrawling. Expect incremental progress, not step-changes. If you see a large DA jump in days, it is likely either a Moz crawl catching up with existing links or a low-quality link scheme that will be corrected on the next recalculation.
Does domain age affect Domain Authority?
Domain age does not directly affect DA. What matters is whether the domain has acquired backlinks. An old domain with no links has DA 1. Domain age does sometimes correlate with higher DA simply because older domains have had more time to accumulate links. But the age itself is not the mechanism.
How many backlinks do I need to increase my DA?
There is no fixed number. Quality beats quantity entirely. One link from a DA-80 editorial site can move your score more than five hundred links from low-quality directories. Focus on acquiring links from high-DA, relevant domains with genuine traffic rather than accumulating bulk links from weak sources. Read the full guide on what is a backlink to understand link quality factors in detail.
Does DA affect my Google rankings directly?
No. DA is a Moz metric that Google cannot read. Your Google rankings are influenced by the actual links in your backlink profile, which are the same links that make up your DA score — but Google processes them through its own systems. The correlation between DA and rankings exists because both are driven by the same underlying asset: quality backlinks. Improving DA and improving Google rankings both require the same activity, but for separate reasons.
Should I use DA or DR for competitive research?
Both are useful. Ahrefs' DR tends to update more frequently and is widely used for competitive link analysis. Moz's DA has been the industry standard for longer and is more universally recognised. For link prospecting and competitor benchmarking, Ahrefs is generally considered more comprehensive. For quick DA checks using free tools, Moz's MozBar browser extension is the most accessible option. Pick one tool and use it consistently for meaningful comparisons.
Is a DA of 30 good for a new site?
A DA of 30 for a site that is two to three years old is a solid, respectable score. It indicates an active and growing link profile. Whether it is "good enough" depends on your competitive landscape. Use the industry benchmarks in this guide to assess whether DA 30 places you above or below your direct competitors.
What is the difference between Domain Authority and Page Authority?
Domain Authority measures the strength of an entire domain or subdomain. Page Authority (PA) measures the strength of a single URL. Both use the same Moz methodology and 1–100 logarithmic scale, but PA is scoped to one page rather than the whole site. A page with many high-quality inbound links can have a PA significantly higher than the site's overall DA, and vice versa. When evaluating the strength of individual ranking pages, PA is the more relevant metric.
Can social media links improve Domain Authority?
Social media links from platforms like Twitter/X, Facebook, LinkedIn, and Instagram are almost exclusively nofollow. Nofollow links do not pass MozRank or contribute directly to DA in any significant way. Social media is valuable for content distribution — it gets your content in front of people who may then link to it from their own websites — but social links themselves are not an authority building tool.
What is a toxic backlink and how does it affect DA?
A toxic backlink is a link from a site that Moz or other tools have identified as low quality, spammy, or manipulative. These can include link farm sites, irrelevant foreign directories, PBN sites, or hacked sites. They contribute negatively to your Moz Spam Score, which feeds into your DA calculation. Running regular backlink audits and disavowing confirmed toxic links via Google Search Console protects both your DA and your Google rankings over time.
Where can I learn more about link building and backlinks?
This site has a full library of resources. Start with what is a backlink for foundational knowledge, then move to how to build backlinks for practical strategies and what is link building for a comprehensive overview of the discipline. For technical terms referenced throughout SEO tools and reports, the SEO glossary covers every major concept.
Last updated: April 2026