What Is Domain Authority (DA)?

What Domain Authority actually is

Domain Authority is a comparative metric published by Moz. It scores a domain from 0 to 100 based on how likely Moz thinks that domain is to rank in Google, using its own crawl of the web. The single most important thing to understand is right there in the definition: DA is a prediction, and it comes from Moz, not from Google.

That distinction matters because people constantly treat DA as if it were a grade Google hands out. It is not. Google has said many times that it does not use a website-wide “authority” score as a ranking factor. DA is one company’s attempt to model the outcome of Google’s ranking system from the outside. A useful model can still be worth watching — but a model of the weather is not the weather.

How the score is built

Moz calculates DA from its own link index. The heaviest input is your backlink profile: how many separate websites (referring root domains) link to you, and how trustworthy and relevant those linking sites appear to be. Moz feeds dozens of these signals into a machine-learning model trained to correlate with actual Google rankings, then maps the result onto the familiar 0-100 scale.

Two properties trip people up:

• It is logarithmic. Climbing from DA 20 to 30 is comparatively easy; climbing from 70 to 80 is extremely hard. The scale is deliberately compressed at the top, where the internet’s most-linked sites live.
• It is relative. DA only means something when compared to other sites. A score of 35 could be excellent in a small niche and unremarkable in a competitive one. There is no absolute pass mark.

DA predicts ranking — it does not cause it

This is the honest heart of the topic. Raising your DA number does not, by itself, move you up in Google. The number tends to rise because you earned good links, and those same links are part of what genuinely helps you rank. Confusing the thermometer with the temperature leads people to chase the metric instead of the substance behind it. If you want the substance, our link building guide and SEO strategy guide cover the work that actually moves rankings.

Why not to obsess over the number

Because DA is driven by links, it is also gameable and easy to misread. A domain can show a high DA off the back of a large but low-quality or irrelevant link profile. That is exactly why judging a linking opportunity on DA alone is a mistake — you should look at relevance, real traffic, and editorial quality, which we walk through in how to evaluate backlink quality.

DA vs Domain Rating (DR)

DA has a well-known counterpart: Domain Rating (DR), Ahrefs’ equivalent metric. They are built by different companies from different indexes, so a site’s DA and DR often differ. Neither is “the truth” — they are two estimates. If you want the parallel explanation, see what is Domain Rating (DR). Once you understand one third-party score, the same cautions apply to all of them.

How to use DA sensibly

DA is not useless — it is a fast, rough proxy that can be handy when used with care:

1. As a relative benchmark. Check where you sit against the specific competitors ranking for your target queries, not against the whole internet.
2. As a coarse filter, never the decision. Use DA to shortlist potential linking sites quickly, then judge each one on relevance, traffic and content before you act.
3. As a trend line. Watch your own DA over months, not days. A steady climb usually signals a healthy, growing link profile.

What DA should never be is the goal itself. Chasing a number invites shortcuts — buying links, mass-producing low-value pages — that can raise the estimate briefly while doing nothing for, or even harming, your real search performance.

Page Authority: DA’s page-level cousin

Moz publishes a companion metric called Page Authority (PA) that predicts the ranking strength of a single page rather than a whole domain. The two are easy to confuse. DA answers “how strong is this website overall?”; PA answers “how strong is this specific URL?”. A powerful domain can host a brand-new page with low PA, and a modest domain can have one exceptional page with surprisingly high PA. When you evaluate a place to earn a link, the PA of the exact page that will carry your link often matters more than the domain-wide DA, because authority concentrates at the page level. Both are Moz estimates, and both carry the same caveats.

What DA cannot tell you

It is worth being blunt about the metric’s blind spots, because they are where people get burned:

• Traffic. DA says nothing about whether real people visit a site. A high-DA domain can be a near-abandoned husk kept alive by old links.
• Relevance. DA has no concept of topic. A DA 80 cooking site and a DA 80 finance site look identical to the score, but only one is relevant to a finance page.
• Content quality. DA does not read the page. Thin, spun, or low-effort content can sit happily on a high-DA domain.
• Penalty status. A site under a Google penalty can still show a healthy DA for a while, because Moz’s crawl and Google’s judgement are entirely separate.

This is exactly why we never accept DA as proof of a good link. Relevance and genuine traffic are checked every time — the discipline in what is a toxic backlink exists precisely because a high score can hide a bad neighbourhood.

How DA and rankings drifted apart

When link metrics first appeared, a single domain-wide authority number was a decent rough proxy for ranking power, because links were a blunter, more dominant signal. Google’s systems have grown vastly more sophisticated since — weighing relevance, intent, page-level signals, freshness, and how well a result satisfies searchers in ways no single 0-100 number can capture. That is the deeper reason DA is a weaker predictor for any individual query than it once was: the thing it models has become far more multidimensional. It remains a fine domain-level snapshot; it is a poor substitute for looking at the actual search results you want to compete in.

Reading DA alongside other signals

The safest habit is to never read DA in isolation. Put it beside estimated organic traffic, topical relevance, and a quick human look at the page, and let those checks either agree or argue. When all point the same way, you can move with confidence. When DA looks strong but traffic is flat and the content is thin, trust the fuller picture over the single number. Tools reinforce this by disagreeing: because Moz, Ahrefs and others crawl independently, a domain that looks strong in one and weak in another deserves a closer manual look rather than a snap decision. Treat every automated authority score as a prompt to investigate, not a conclusion to act on.

Where the real work is

If DA is a symptom of a healthy site, the cure is ordinary good SEO: earn relevant links from pages people actually visit, publish content worth linking to, and keep your own site technically sound. That is why we treat metrics as a readout, not a target. When we place editorial link insertions or run an SEO audit, the aim is genuine relevance and quality — the DA and DR movements tend to follow, not lead.

Treat Domain Authority as a weather forecast: useful for a quick read, worth a glance before you plan, but never mistaken for the sky itself. Build the real thing — trust, relevance, and links people give you on purpose — and the score will look after itself.