Most people who search for a domain authority checker want one of two things: the number itself, or an answer to the question sitting behind the number — "is my site strong enough to rank yet, and if not, what is missing?" This page is built for the second question, and it is honest about the first. The tool above does not fetch your Moz Domain Authority. It cannot. Domain Authority is a proprietary score that Moz calculates from Moz's own index of the web's links, and the only place to get the genuine figure is Moz. What this checker does instead is take the signals that genuinely underlie authority — unique referring domains, domain age, link-profile cleanliness, indexed content footprint, and branded search demand — and turn them into a transparent estimate whose every weight is printed on the page and editable by you.
That distinction is the whole point. A tool that flashes a number at you without saying where it came from is worse than useless, because you will make decisions on it. A tool that shows its arithmetic, names its assumptions as assumptions, and tells you which input is dragging the result down gives you something you can actually act on. Arb Digital builds link-earning and content programmes around exactly these signals, so the model here reflects how we prioritise work for clients — not a universal truth, and we would rather you knew that.
What Is Domain Authority?
Domain Authority (DA) is a metric created by Moz, expressed on a 1–100 logarithmic scale, designed to predict how likely a domain is to rank in search results relative to other domains. Two things about it are commonly misunderstood, and both matter more than the score.
First, it is comparative, not absolute. A DA figure means nothing in isolation; it means something when you set it beside the domains you compete with for the same queries. A score that looks modest in one industry can be dominant in another, because the whole scale is relative to the strongest sites on the web.
Second, Google does not use Domain Authority. It is not a Google ranking factor, it has never been one, and it will never appear in Search Console. Google has its own internal notions of site quality and link value, and it does not publish them. DA is one company's public model of ranking potential, built from one company's crawl. It is a useful directional compass and a decent way to track your own trajectory over time. It is not a scorecard Google is grading you on, and no amount of raising it will directly cause rankings.
Because the scale is logarithmic, movement is not linear either. Climbing the lower and middle stretches of the scale takes far less link equity than climbing the upper stretches, where each additional point represents a large amount of additional authority. This is why sites plateau: the same effort that produced steady early gains produces visibly less movement later, and nothing has gone wrong.
How to Check Domain Authority (The Real Number, for Free)
If what you need is your genuine score, here is the honest route. There is no trick, no workaround, and no free third-party tool that can reproduce Moz's number without Moz's data.
- Moz Domain Analysis — the source of the real Domain Authority metric, from the company that invented it. It has a free tier with a limited number of lookups per month. This is the correct place to check domain authority, and we would rather send you there than pretend we can substitute for it.
- Ahrefs Website Authority Checker — reports Domain Rating (DR), Ahrefs' comparable metric, free and without a signup.
- Semrush Backlink Analytics — reports Semrush's Authority Score alongside a full backlink breakdown.
Those three will not agree with each other, and that is expected rather than a fault. Each company crawls a different slice of the web and applies a different formula, so DA, DR and Authority Score are three separate models of a shared idea, not three attempts to measure one true quantity. Pick one, and compare a domain against itself over time or against competitors inside that same tool. Comparing your DA to a rival's DR tells you nothing.
Once you have the real figure, the estimator above becomes the more useful of the two, because it is the one that tells you which lever to pull.
What Is a Good Domain Authority Score?
There is no universal threshold, and anyone quoting one is selling something. Because the scale is relative and logarithmic, "good" is defined entirely by the competitive set for the queries you want. The honest way to answer the question is procedural rather than numerical:
- Take the queries that matter commercially to you — the ones that bring buyers, not just traffic.
- Look at who currently ranks on page one for them, and check the authority score of those specific domains in a single tool.
- Your target is the softest part of that page-one range, not the strongest. If the weakest page-one result is well above where you sit, you are not losing on content; you are losing on authority, and content edits will not fix it.
- Repeat per query cluster. The bar for a niche long-tail query and the bar for a head term can differ enormously on the same site.
What a good score actually looks like, in practice, is one that is rising steadily while your referring domain count rises and your spam score stays flat. A score that moves without those underlying changes is measurement noise or index churn, not progress.
How This Domain Authority Checker Estimates Your Score
The estimator combines five inputs, each capped at a weight you can see and change in the Edit the weights panel. The defaults are ours. They reflect Arb Digital's working view of what tends to move authority, informed by client work — they are not derived from Google's algorithm, which is not published, and not from Moz's, which is proprietary. Change them freely; the total score renormalises against whatever the weights add up to, so you are never stuck with our judgement.
- Referring domains (default 40). The heaviest weight, because the count and diversity of unique linking domains is the signal most consistently associated with search visibility. Scored on a logarithmic curve, so the jump from five to fifty domains matters far more than the jump from five hundred to five hundred and fifty.
- Domain age (default 20). Capped and secondary. Age itself is not authority; it is a proxy for how much time a site has had to accumulate links naturally. An energetic three-year-old site routinely out-earns a dormant ten-year-old one.
- Clean link profile (default 20). Scored inversely from the spam or toxicity percentage your backlink tool reports. A profile full of manipulative links suppresses real authority rather than adding to it.
- Indexed content (default 10). Also logarithmic. A larger crawlable footprint gives more surface for links and rankings to land on, but volume alone plateaus quickly, which is why the weight is modest.
- Branded search demand (default 10). When people type your name into Google rather than a generic query, that is real-world recognition no backlink count captures.
The result panel then does the part most checkers skip: it names the input contributing most of your current score, names the input where you are leaving the most points unclaimed, and reports your link diversity separately. That turns the output from a vanity number into a diagnosis. Two sites can produce the same estimate for entirely different reasons — one carried by age and a clean profile with almost no links, another carried by links with a worrying spam score — and those two sites need completely different work.
How to Read Your Domain Authority Score Breakdown
Each signal row shows points earned against the weight available. The gap is the interesting part. A row scoring near its ceiling is finished work; there is little left to win there no matter how much effort you apply. A row scoring far below its ceiling is where the next few months of effort should go.
The link diversity readout compares total backlinks to referring domains. A high ratio — many links, few domains — means your profile is concentrated, which is fragile. Site-wide footer links, a single directory network, or one sponsorship that appears on every page of a partner site all inflate backlink counts without broadening the base. Losing one relationship can then remove a large share of your link equity at once. A profile spread across many unrelated domains survives that.
The biggest opportunity line is deliberately blunt. If it points at referring domains, no amount of publishing will substitute for outreach. If it points at your spam score, the work is subtraction — auditing and disavowing — before any addition helps. If it points at branded search, the constraint is marketing rather than SEO, and link building will underperform until people know who you are.
Quantity Versus Quality: Why Raw Backlink Counts Mislead
More backlinks does not mean more authority. Ten links from ten distinct, relevant, moderately established domains will generally do more for real authority than several hundred links from a small cluster of low-quality directories. This is why the tool asks for referring domains separately from total backlinks, and why diversity gets its own readout rather than being folded into the score.
Relevance compounds the effect. A link from a publication your customers actually read carries context that a link from an unrelated general directory does not, because it arrives surrounded by topically related content and is clicked by people with the right intent. That is also why links you cannot easily buy tend to be the ones worth having: difficulty of acquisition and value are correlated, not coincidentally.
Why Chasing the Number Directly Is Backwards
Treating "raise our DA" as an objective reliably produces the wrong activities: bought links, mass directory submissions, reciprocal link schemes, and paid guest-post networks. All of them can inflate a backlink count. None of them builds anything, and most raise the spam score that the same tools then flag.
Authority scores are lagging indicators. They describe authority that already exists as a consequence of real work — original research, genuinely useful tools, expert content, digital PR, and actual relationships with other publishers in your field. Do the work and the number follows. Optimise for the number and you tend to end up with a profile that looks manipulated, because it is.
What Actually Raises Authority
Three things, in roughly this order of leverage.
Earned links. Not requested, not purchased — earned, because something you published was worth citing. In practice this means producing assets other people need: original data from your own operations, tools that solve a real problem, definitive guides on narrow topics nobody has covered properly, and expert commentary offered to journalists working your beat. This is slow, it is the highest-leverage thing available, and it is where most of the difficulty sits.
Topical depth. A site that covers one subject thoroughly reads as authoritative on it in a way a site with scattered coverage does not. Depth means clusters of interlinked pages that genuinely exhaust a topic, each answering a distinct question, rather than one thin page per keyword. Depth also gives outreach something to point at: it is far easier to earn a link to a comprehensive resource than to a sales page.
Technical health. The unglamorous floor beneath the other two. Pages that are crawlable, fast, correctly canonicalised, free of duplicate and orphaned content, and served without redirect chains let the authority you earn actually reach the pages that need it. Technical work rarely creates authority on its own, but technical problems routinely waste it — link equity landing on pages that redirect, or on duplicates that never consolidate.
Earned links come from outreach, original assets and relationships, which take sustained time rather than a clever tactic. If you would rather run that yourself, everything you need is described above and in our guides — there is no secret to withhold. If you would rather hand it to someone, that is precisely the work Arb Digital's SEO services exist to do: link-earning campaigns, topical content programmes and the technical clean-up that makes both count. And if you are building the plan yourself, the business and money section of our digital library covers the marketing and growth side that sits underneath any authority programme.
See Our SEO Services All Free ToolsHow Authority Builds Over Time
Authority accumulates the way most durable business assets do — slowly, and largely as a side effect of doing other things well. Sites that publish original research and useful tools attract links because other people cite things worth citing. Sites that run consistent digital PR earn links from domains that are effectively unobtainable any other way.
Branded search behaves the same way. Rising branded search alongside a thin backlink profile usually means the link signals have not caught up with a real reputation, and outreach will convert unusually well because people already recognise the name. The reverse pattern — a large backlink count with almost no branded search — is often a profile that was manufactured rather than earned, and it tends to be fragile.
Expect movement on the scale of quarters, not weeks. Any tool or service promising rapid gains is describing something that is either measurement artefact or manipulation.
Common Mistakes to Avoid
- Believing any free tool returns your real Moz DA. Including this one. If a site shows an instant DA without Moz's data behind it, it is estimating and usually not saying so.
- Treating DA as a Google ranking factor. It is not used by Google in any capacity.
- Buying links to move the number. This raises spam scores and can suppress both authority and rankings.
- Comparing scores across tools. DA, DR and Authority Score are separate metrics. Compare like with like.
- Ignoring link diversity. A hundred links from three domains is weaker and more fragile than thirty links from thirty relevant domains.
- Fixing content when authority is the constraint. If page-one competitors are far above you, rewriting a page will not close the gap.
Related Free Tools From Arb Digital
Pair this estimate with the SEO Content Length Checker to make sure your pages have the depth to earn links, the Flesch Reading Ease Calculator and Readability Checker to keep that content easy to read, and the Headline Analyzer to sharpen the pages you hope people will link to. Browse everything at our free online tools hub.
Frequently Asked Questions
No. This tool does not query Moz and has no access to Moz's index. Domain Authority is Moz's proprietary metric and only Moz can produce it. What this page gives you is Arb Digital's own estimate, calculated in your browser from figures you enter, using weights we publish and you can edit. For the genuine number, use Moz Domain Analysis, which has a free tier. Arb Digital is not affiliated with Moz.
Use Moz Domain Analysis, the free tool from the company that created the metric, which allows a limited number of lookups per month. Ahrefs Website Authority Checker and Semrush Backlink Analytics offer free checks of their own comparable metrics, Domain Rating and Authority Score. No free third-party tool can reproduce Moz's figure without Moz's data.
There is no universal threshold, because the scale is relative and logarithmic. The useful answer is competitive: look at the domains currently ranking on page one for the queries you want, check their scores in one single tool, and treat the weakest page-one result as your target. A good score is also simply one that is rising while your referring domains rise and your spam score stays flat.
No. Domain Authority is a third-party metric created by Moz. Google does not use it, or any similar third-party authority score, anywhere in its search ranking algorithm, and it never appears in Google Search Console.
They are Arb Digital's own editorial judgement, based on how we prioritise client work. They are not Google's, which are not published, and not Moz's, which are proprietary. We show every weight on the page and let you change it, and the score renormalises against whatever your weights total.
No. The entire calculation runs as vanilla JavaScript in your own browser. Nothing is uploaded, stored, logged or transmitted to Arb Digital or any third party, and the tool works with your connection switched off.
Referring domains. A link profile spread across many unique, relevant domains is a far stronger and more resilient signal than a large raw backlink count concentrated in just a few sites.
Because each company crawls a different slice of the web and runs its own proprietary formula. They are three separate models estimating the same underlying idea of authority, not three measurements of one true value.
Not as a direct goal. Authority scores are lagging indicators of authority that already exists. Focus on earned links, topical depth and technical health, and the number follows as a byproduct.
Generally a spam score under 5 to 10 percent is considered healthy by the tools that report it. Higher figures usually indicate low-quality or manipulative links that can suppress both authority and rankings.
