Domain Authority

What Domain Authority Is, in Plain Language

Domain Authority, usually shortened to DA, is a score from 1 to 100, created by the SEO software company Moz, that predicts how likely a whole domain is to rank in search results, compared with other domains. It is built mainly from the domain's link profile: how many other sites link to it, how many distinct domains those links come from, and how strong those linking domains are, combined by a machine-learning model that Moz trains against real search results. A higher score means a stronger predicted ability to compete in search, not a stronger page, a larger business, or a better product.

The most important sentence about Domain Authority, and the one this page will repeat because it is so often missed, is this: Domain Authority is a third-party metric, not a Google ranking factor. Google does not use Domain Authority in its ranking systems, does not calculate it, and does not consult it. Moz says so itself on its own explainer page, in plain words: Domain Authority is not a Google ranking factor and has no effect on the search results. Google's own guidance on third-party tools makes the same point generally, that outside tools do not have access to Google's internal ranking data. A site owner who treats a DA score as if Google had assigned it is misunderstanding what the number is, and will make decisions on a false premise.

Domain Authority is best understood as a thermometer, not as the fever. The thing it measures, the strength and breadth of a site's link profile relative to other sites, is genuinely related to ranking, because links remain one of the signals search engines use to discover pages and to judge relevance. But the score itself is Moz's estimate, made from Moz's own crawl of the web, with Moz's own model, and it can move for reasons that have nothing to do with a site's own work, such as Moz recalibrating its model or the strongest sites on the web gaining links. That distinction, between the underlying link profile and the score that summarises it, runs through everything that follows.

What Domain Authority Is Not

It is not a measure of traffic, of content quality, of trustworthiness in any general sense, or of a single page's strength. A domain can gain traffic without its DA moving, and its DA can move without its traffic changing, because the score is a relative prediction, not a traffic report. It is not the same as Page Authority, Moz's companion score, which predicts the ranking strength of an individual page rather than a whole domain. And it is not interchangeable with other tools' authority scores: Ahrefs' Domain Rating and Semrush's Authority Score are different companies' estimates, built from different crawls and different models, and their numbers will not match Moz's. Comparing a Moz score with an Ahrefs score is comparing two thermometers calibrated differently. The glossary entries on backlink and on off-page SEO describe the link work that underlies all of these scores.

How Domain Authority Works

Moz calculates Domain Authority by combining its link metrics into a single score. The inputs Moz names publicly include linking root domains, the number of total links, MozRank, MozTrust, and other link signals, fed into a machine-learning model that correlates those signals with actual search rankings across many results. The exact weights are proprietary, and Moz does not publish a formula that would let a site owner compute its own DA by hand. What can be said, from Moz's own description, is that breadth matters more than raw count: many links from many distinct, respected domains count for more than many links from a few domains, and a link from a strong domain counts for more than many links from weak ones.

The scale is logarithmic, which is the second fact that shapes every practical use of the score. On a logarithmic scale, each additional point becomes harder to earn as the score rises, because the score is measured against the strongest sites on the web. Moving from a low score to a somewhat higher one is a realistic outcome of steady, honest link earning, while moving from a high score to a still higher one requires vastly more link strength, because the sites at the top of the scale are the most linked-to sites on the internet. A new site, as Moz notes, starts with a low score, and that low starting point is normal, not a verdict on the site's content or its future.

Domain Authority is also relative, not absolute. Because the score compares a domain's link profile with the profiles of other domains in Moz's index, a site's score can fall even when the site has lost no links and published nothing worse, simply because its competitors gained links, or because Moz updated its model or its index. Conversely, a site's score can rise when competitors lose links, without the site itself improving. This relativity is why Moz's own advice, and the advice of every careful guide to the metric, is to use DA for comparison: against the sites that rank for the queries a business actually targets, and against the site's own past scores measured with the same tool, rather than as an absolute grade to be chased for its own sake.

Chart: What Domain Authority Summarises, and What It Does Not

Source note: the inputs named are those Moz lists publicly, linking root domains, total links, MozRank, MozTrust, and other link signals, and the limits follow Moz's own statement that Domain Authority is not a Google ranking factor. No site's DA figure is shown, because this page is about the metric, not about any particular domain.

Why Domain Authority Matters, Within Its Limits

Domain Authority matters, within its limits, because it gives a small business a quick, comparative read on a competitive landscape that would otherwise be hard to see. Before writing for a query, a site owner can look at the domains that already rank for it, note their DA scores, and ask a realistic question: is this a field of sites with link profiles like mine, or a field of sites whose link profiles dwarf mine? That question does not decide whether to write, but it informs the decision, and it sets expectations about how long a page may take to compete. A query whose ranking pages all have far stronger link profiles than the site's own is a long-term goal, not a first page, while a query whose ranking pages are comparable is a realistic target now.

Domain Authority matters second as a progress check, used slowly. A site that earns links steadily from relevant, respected sources, through useful content, genuine relationships, and honest outreach, should expect its link profile to strengthen over time, and DA is one way to see that strengthening in a single number, alongside the more direct evidence of rankings and traffic. The key discipline is to use it as one signal among several, and to distrust any single-number story. A site whose DA rises while its rankings and traffic fall has not improved; it has a number that moved. A site whose DA is flat while its rankings and traffic rise has not failed; it has a number that lags the reality that matters.

Common Domain Authority Mistakes

The first mistake is chasing the number instead of the links. A site that buys links, joins link schemes, or publishes thin content designed only to attract links, in order to raise its DA, is optimising a third-party estimate while risking the real asset, which is its standing with search engines and readers. Links earned by manipulation can be discounted or penalised, and a DA gain built on them can vanish when the model or the index changes. The honest route is slower and less exciting: publish pages worth linking to, make them easy to find and cite, and earn links from sites that genuinely value them.

The second mistake is comparing unlike with unlike. A DA score from Moz cannot be compared with a Domain Rating from Ahrefs or an Authority Score from another tool, because each tool crawls a different portion of the web and models it differently. Even within Moz, a score should be compared with scores measured at a similar time, since model updates shift the scale. A site owner who switches tools mid-year, or who quotes a competitor's score from a different tool as if it were on the same scale, is comparing two thermometers and concluding that one room is warmer.

The third mistake is treating a low score as a verdict, or a high score as a guarantee. A new site with a low DA can still rank for specific, well-chosen queries, particularly long-tail questions where the ranking pages are thinner and the reader's need is clearer, as described in Rankenza's long-tail versus head keyword guide for a small shop. Conversely, a high-DA domain can still fail to rank for a query its pages answer poorly, or whose intent they mismatch. DA predicts the likelihood that a domain will outrank another, in Moz's own framing; it does not cause a ranking, and it does not override relevance, intent, or page quality.

How to Apply Domain Authority Work Step by Step

Start by recording the baseline honestly. Note the site's current DA, the date, and the tool used, and note the DA scores of the domains that rank for the handful of queries the business most wants to win. Do not import scores from a different tool into the same comparison. This baseline is not a grade; it is a map of the competitive field, and its purpose is to inform which queries are realistic now, which are longer-term goals, and where the link gap is largest.

Next, examine the link profile behind the number, not just the number itself. Look at which domains link to the site, how relevant they are to the business's topic, and which of the site's pages they link to. A profile of many links from a few irrelevant domains is weaker, in every sense that matters, than a profile of fewer links from relevant, respected domains, even if the scores look similar. Use the Broken Link Checker as part of this housekeeping, to find links that no longer resolve, and fix or reclaim them where the linking site is willing, since a broken link helps nobody.

Then earn links the slow way, through pages worth linking to. Publish guides that answer real questions completely, with examples and reasoning a citing site can quote; create resources, such as templates or checklists, that other sites naturally reference; and build relationships with sites in the same field through genuine contribution, not through payment or exchange schemes. Rankenza's guide to earning backlinks to blog posts walks through that earning work without buying links, which is the only route consistent with the metric's own logic: DA is meant to summarise earned link strength, so manufacturing it defeats its purpose.

After that, protect the links already earned. When a site redesigns, changes its addresses, or retires pages, it should redirect the old addresses to their successors, so that links pointing to the old addresses still arrive somewhere useful, and so that the link strength they carry is not wasted. The glossary entry on internal linking covers the site's own link structure, which supports the same goal from inside: a well-linked site helps readers and search engines reach its strongest pages, and helps new links to one page benefit the site as a whole.

Finally, review DA on a slow cadence, alongside the signals that matter more: rankings for target queries, organic traffic, and conversions or enquiries from search. If DA rises while those signals rise, the link work is probably helping. If DA moves while those signals do not, treat the movement as information about Moz's index or model, not as a verdict on the business. And if DA falls while rankings and traffic hold steady, do not panic: check the link profile for a real loss, such as a strong linking site closing or removing links, and act on that real loss, rather than on the number alone.

How Rankenza Handles Domain Authority

Rankenza does not promise to raise a customer's Domain Authority, because DA is Moz's score, not Rankenza's, and not Google's, and no honest service can promise to move a third party's model. What Rankenza does is the underlying work that a stronger link profile is built from: articles researched from the top 10 search results, written in original words, reviewed by a human editor, and linked internally from the customer's own sitemap, so that the pages are worth linking to, worth citing, and worth returning to. That is the work that earns links over time, and it is the only work that can honestly be claimed.

Rankenza's own guides, such as how to earn backlinks to blog posts, take the same position: earn links by being useful, do not buy them, and judge the result by rankings, traffic, and enquiries, not by a single third-party number. Pricing follows the same plain approach as the rest of Rankenza's work. Your first article is free, then $3.60 per article or $89 for 50 credits, with no subscription, so a small business can test one article, read the draft, and decide whether the research, writing, and review are worth continuing.

How This Looks on Rankenza

Typical approach: DA chased as if Google assigned it; links bought to move the number; scores compared across different tools; daily checking and panic over small, relative movements.

Rankenza's approach: top-10 search research first; original draft reviewed by a human editor; internal links drawn from the customer's own sitemap; links earned by being useful, never bought; first article free, then $3.60 per article or $89 for 50 credits. See it in practice in how to earn backlinks to blog posts and check link health in the Broken Link Checker.

Sources: What the Research Says

According to Moz's Domain Authority explainer, Domain Authority is a score from 1 to 100 that predicts how well a website will rank, calculated by combining link metrics including linking root domains, total links, MozRank, MozTrust, and other signals, and Moz states plainly that Domain Authority is not a Google ranking factor and has no effect on the search results. Moz's explainer also describes the score as a comparative tool, to be used when comparing one site with another or when tracking a site's strength over time, rather than as an absolute grade. Independent summaries of Moz's guidance agree that the scale is logarithmic, so that moving from a lower score to a somewhat higher one is easier than moving between high scores, and that a new site starts near the bottom of the scale. Google's SEO Starter Guide, meanwhile, describes links as a way search engines discover pages and judge relevance, which is the underlying reality the DA estimate tries to summarise, without the estimate itself being a Google signal. Where this guide gives no figure for any particular site, that is deliberate: DA is a relative, tool-specific estimate, and a single site's score would mislead more than it informed.

Frequently Asked Questions

Is Domain Authority a Google ranking factor?

No, plainly and emphatically no. Domain Authority is Moz's third-party estimate, built from Moz's crawl and model. Google does not use it, calculate it, or consult it in ranking. Any claim that raising DA directly raises Google rankings mistakes the estimate for the thing it estimates.

What is a good Domain Authority score?

There is no universal good score, because DA is relative and logarithmic. A score is meaningful only against the scores of the sites a business actually competes with for its target queries, and against the site's own past scores measured with the same tool. A score that is competitive in one field may be weak in another, and a new site's low score is normal, not a failure.

How long does it take to raise Domain Authority?

Slowly, and not on a fixed timetable. DA reflects a link profile built over time, and Moz's index and model refresh on their own rhythm, so a link earned today may not be reflected immediately. The honest answer is measured in steady earning over months, not in a campaign that promises a new score by a fixed date.

Should I buy links to raise my Domain Authority?

No. Buying links to manipulate a score risks the site's standing with search engines, and a DA gain built on manufactured links can vanish when the model or index changes. Earn links by publishing pages worth citing, and judge the result by rankings, traffic, and enquiries, not by the score alone.