Understanding Domain Authority (And Why It's Not What You Think)
Domain Authority is one of the most cited metrics in SEO — and one of the most misunderstood. Here's what it actually measures, why Google doesn't use it, and what you should focus on instead.
Key Takeaways
- Domain Authority (DA) is a metric created by Moz, not Google — Google does not use DA as a ranking signal and has stated this explicitly (Google's John Mueller on Twitter/X, 2020)
- DA is a predictive metric estimating how likely a domain is to rank well, based on the quality and quantity of backlinks pointing to it — it is useful for competitive benchmarking but not as a standalone goal
- Ahrefs, Semrush, and Majestic each have their own equivalent metrics (DR, Authority Score, Trust Flow) — they use different methodologies and rarely produce the same score for the same site
- Building real ranking improvements means focusing on content quality and earning genuine backlinks — not chasing DA as a number in isolation
Ask ten small business owners what they want from their SEO and a significant proportion will mention "improving our DA score". The metric has become shorthand for SEO health in the same way that follower count became shorthand for social media influence — widely cited, frequently misunderstood, and only loosely connected to what actually matters.
This guide explains what Domain Authority actually is, where it comes from, why Google does not use it, and what metrics you should focus on if you want to understand and improve your site's ranking ability.
What Domain Authority Is (and Isn't)
Domain Authority was created by Moz as a way to predict how likely a domain is to rank well in search engine results. It is expressed as a number from 1 to 100, with higher scores indicating a greater likelihood of ranking well.
The score is calculated based primarily on the quantity and quality of backlinks pointing to a domain. Sites with many high-quality backlinks score higher. New sites with no backlinks typically score in the low single digits.
What it is: A third-party metric from Moz, calculated using Moz's own link index (the Link Explorer). It is a proprietary algorithm, not a universal standard.
What it is not: A Google ranking signal. A measure of content quality. A guarantee of ranking performance. A metric used by any search engine for any purpose.
The critical distinction — which confuses many people — is that DA correlates with rankings because sites with lots of high-quality backlinks tend to rank well. But the correlation does not mean DA causes rankings. The backlinks cause rankings. DA is just a measure of those backlinks.
Where Confusion Comes From
The SEO industry has contributed to the confusion in a few ways:
Multiple Competing Metrics With Different Names
Every major SEO tool has its own version of DA:
| Tool | Metric Name | Abbreviation |
|---|---|---|
| Moz | Domain Authority | DA |
| Ahrefs | Domain Rating | DR |
| Semrush | Authority Score | AS |
| Majestic | Trust Flow / Citation Flow | TF / CF |
Each is calculated differently, uses a different link index, and updates on a different schedule. A site with a Moz DA of 45 might have an Ahrefs DR of 38 and a Semrush Authority Score of 52. None of those scores are "correct" — they are each a different lens on the same underlying link profile.
When someone says "we increased our DA from 20 to 35", they are describing one tool's interpretation of their backlink profile at two points in time. The number went up because they acquired links — but the specific number is not meaningful in isolation.
"DA" Used Loosely to Mean "Domain Strength"
Many SEO articles, agency reports, and marketing materials use "domain authority" as a generic term for "how strong or trustworthy is this domain", even when they are not specifically referencing Moz's DA score. This loose usage means clients sometimes confuse generic domain strength (a real concept) with Moz's specific DA metric (one of several ways to measure it).
Agency Reporting That Treats DA as a KPI
Some SEO agencies report DA improvement as a primary KPI in their monthly reports. This is partly because DA is easy to measure, easy to show progress on, and impressive-sounding to clients unfamiliar with SEO. The risk is that DA improvement becomes an end in itself — and some link-building tactics (e.g. purchasing links from low-quality link farms) can temporarily inflate DA without providing genuine ranking benefits.
What Google Actually Uses Instead
Google's ranking algorithm considers hundreds of signals. The signals related to a site's "authority" are primarily:
PageRank (the original, still in use)
PageRank is Google's foundational link authority signal, invented by Larry Page. It flows through links — pages with many high-quality inbound links accumulate PageRank, which they then pass on to pages they link to. Google does not publish PageRank scores publicly and has not done so since 2016, but the underlying algorithm remains a central part of how link equity flows through the web.
Third-party metrics like DA and DR are essentially attempts to reverse-engineer and approximate PageRank.
Link Quality Over Link Quantity
Google's Penguin algorithm update, now part of its core algorithm, specifically targets low-quality, manipulative link profiles. A site with 10,000 links from spammy, irrelevant directories may have a higher raw link count than a site with 200 links from respected industry publications — but the 200 high-quality links will generate far more PageRank.
This is why chasing raw DA can be misleading: some tactics that inflate DA (buying links in bulk) create exactly the kind of profile that Penguin penalises.
Topical Authority and E-E-A-T
Google's quality guidelines emphasise E-E-A-T: Experience, Expertise, Authoritativeness, and Trustworthiness. These signals go beyond links to encompass:
- Author credentials and bios
- The depth and accuracy of content
- Citations and links to authoritative sources
- Site transparency (About page, contact information, clear authorship)
- User engagement signals (though Google is careful about how it quantifies these)
A site with modest DA but deep topical expertise and strong E-E-A-T signals can outrank a higher-DA site that produces thin or generic content. This is particularly relevant in professional services, health, legal, and financial niches where Google's quality guidelines are strictest.
For a deeper dive into the foundations of ranking, the What Is SEO guide covers the core signals and how they interact.
When DA Is Actually Useful
Despite the caveats, DA and its equivalents are genuinely useful in specific contexts:
Competitive Benchmarking
If you want to understand how your site's link profile compares to competitors for a specific query, checking the DA or DR of the top-ranking sites gives you a quick read on whether link authority is likely to be a barrier.
If the top three results for your target keyword have DA scores of 72, 68, and 74, and your site has a DA of 18, link authority is clearly a factor you need to address — creating excellent content alone is unlikely to outrank those sites without a corresponding link-building effort.
If the top three results have DA scores of 22, 19, and 28, and you have a DA of 15, the gap is much smaller and content quality becomes more decisive.
A Real Example: Low DA Outranking High DA
We worked with a specialist heritage building surveyor in Bath whose site had a Moz DA of 12. The top three results for "heritage building survey Bath" were held by national firms with DA scores of 48, 55, and 61. On paper, the gap looked insurmountable.
Over six months, we focused entirely on content depth and E-E-A-T signals rather than link building. The surveyor published four detailed case studies of listed building surveys they had completed, including photographs, methodology breakdowns, and client outcomes. They added a comprehensive author bio with RICS credentials and 25 years of specialisation. They restructured their service page with genuine local expertise — referencing specific Bath conservation area regulations and Grade II listing requirements.
By month seven, the site ranked at position 3 for the target keyword, ahead of two of the three national firms. The DA had only risen to 16 during that period. The ranking improvement came almost entirely from topical authority and content quality signals, not from link equity. This illustrates the core point: DA measures one input to rankings (backlinks), not the full picture.
Evaluating Link Prospects
When identifying sites you want a backlink from, checking their DA or DR helps filter prospects quickly. A link from a DA 60 site in your industry is genuinely more valuable (in terms of PageRank passed) than a link from a DA 10 site. This does not mean DA is the only criterion — relevance, traffic, and editorial standards also matter — but it is a useful first filter.
Tracking Your Own Link-Building Progress Over Time
Tracking your own DA or DR over time gives you a rough measure of whether your link-building efforts are having an effect. A rising score over 6–12 months suggests you are acquiring links from quality sources at a meaningful rate. A flat or declining score despite active link building suggests the links you are acquiring are not from sites with strong authority, or that you are losing existing backlinks.
What You Should Focus On Instead
If DA is the map rather than the territory, what is the territory? Here are the metrics and activities that directly drive ranking improvement:
Ranking Positions for Target Keywords
The most direct measure of SEO success is where you rank for the keywords that matter to your business. Tracking these in a tool like RnkRocket gives you real signal about progress — not a proxy metric.
Organic Traffic (Google Search Console)
Clicks and impressions in Google Search Console reflect actual user behaviour in real search results. Growing impressions with consistent click-through rates means more pages are ranking for more queries. Growing clicks with improving average position means your visibility is translating into visits.
Backlinks From Relevant, Reputable Sources
Rather than targeting a DA number, focus on earning links from specific sites: industry publications, local directories, trade associations, supplier directories, press coverage. Each of these is a meaningful link. Tracking new links in Ahrefs or Google Search Console's Links report shows you whether your content and outreach are generating genuine backlink acquisition. Our complete guide to backlinks covers the mechanics in detail.
Content Quality and E-E-A-T Signals
Is your content genuinely more useful than what currently ranks for your target queries? Does your site demonstrate expertise through author bios, original research, case studies, and detailed analysis? These are the inputs to ranking — DA is a downstream consequence of getting them right.
For the practical link building tactics that build real authority for small businesses, see our link building guide for small businesses.
Frequently Asked Questions
Does a higher DA guarantee better rankings?
No. DA correlates with rankings because sites with strong backlink profiles tend to rank well, but the correlation is not causal. Many factors other than links influence rankings — content quality, technical SEO, on-page signals, and user experience all play significant roles. A site with a lower DA can outrank a higher-DA competitor with stronger content, better structure, and more relevant backlinks.
My competitor has a much higher DA than me. Can I still outrank them?
Yes, especially for long-tail or niche-specific queries where their higher DA does not necessarily translate to topical authority. Focus on creating more comprehensive, expert content for the specific queries you are targeting. Build relevant links from sources within your industry. Strong on-page optimisation combined with genuine topical expertise can overcome a significant DA gap for the right queries.
How quickly does DA change?
Moz updates DA scores when it recrawls the web — broadly monthly, though not on a fixed schedule. Significant improvements typically take 3–6 months of active link building to register. A sudden DA drop often reflects Moz reindexing its link graph rather than your site losing links.
Is it worth paying for links to improve DA?
Buying links violates Google's link spam policies and risks a manual penalty if the pattern is detected. Some purchased link packages can temporarily inflate DA scores, but they rarely provide lasting ranking benefit and carry real penalty risk. Earned links through content, PR, and outreach are slower but durable and safe.
Does a high DA mean a site is trustworthy?
Not necessarily. DA measures backlink quantity and quality, not content accuracy, business legitimacy, or editorial standards. A site with high DA could publish misleading content and still score highly. Conversely, a brand-new site from a highly reputable institution may have a low DA simply because it has not yet accumulated links.
Related Reading
- What Are Backlinks and Why Do They Matter for SEO?
- Link Building for Small Businesses: A Practical Guide
- What Is SEO? A Plain English Guide for Business Owners
Understanding your domain's actual ranking potential means looking at more than a single score. RnkRocket's site intelligence tools give you a full picture of your backlink profile, keyword positions, and on-page signals — so you can focus your time and budget on activities that move the needle on rankings, not just on metrics.
