Domain Authority (DA for short) is a metric that expresses the strength of an entire domain as a value between 1 and 100. It estimates how likely it is that a domain will rank well in search results. At its core it is based on the backlink profile: how many domains link to the site, and how strong are those domains themselves?

One classification is important from the start, and it is missing from many guides: Domain Authority is not a Google metric, it is the product of a third-party provider. It is an outside estimate - not a value that Google calculates, publishes or uses for ranking.

Who assigns the Domain Authority?

The term comes from the SEO provider Moz. Because the name has caught on, "Domain Authority" is used today as a generic label for all authority scores - even though every provider calculates it independently. The best-known scores:

• Domain Authority (Moz) - scale 1 to 100, based on the Moz link graph.
• Domain Rating (Ahrefs) - scale 1 to 100, weights the number and strength of referring domains.
• Authority Score (Semrush) - factors in traffic estimates and spam signals besides link data.
• Trust Flow & Citation Flow (Majestic) - deliberately separates link quantity from link quality.
• Visibility Index (Sistrix) - measures something different, see the section further down.

Two domains can therefore carry noticeably different values depending on the tool. Anyone comparing authority scores has to use the same tool throughout - a Moz value of 40 and an Ahrefs value of 40 are not the same thing.

Domain Authority is not a Google metric

Google has repeatedly made clear that it does not use an internal "domain authority score" that rates a whole domain with a single number. What gets rated are individual pages for individual queries. The publicly visible PageRank, which came closest to that idea, was switched off back in 2016.

One practical consequence follows from that: a rising DA value is no proof of better rankings, and a falling value is no reason to panic. The metric correlates with good rankings because both depend on the same factor - a strong, topically relevant backlink profile. It does not cause the ranking.

Page Authority vs. Domain Authority

Because Google rates individual pages and not domains, every domain-level score has a page-level counterpart: Page Authority (PA). Both metrics come from the same providers, use the same scale from 1 to 100 and are both built logarithmically. But they answer different questions:

• Domain Authority rates the entire domain. Its basis is the complete link profile of all subpages together.
• Page Authority rates a single URL. Its basis is the links pointing at exactly that page - from outside as well as from within your own site.

At Ahrefs the two values are called Domain Rating (DR) and URL Rating (UR); the principle is the same. Anyone comparing values therefore has to stay not only with the same provider but also on the right level.

Why the distinction matters in practice

The two values regularly drift apart - and that is exactly where the typical misjudgements come from:

1. Strong domain, new subpage. A shop with DA 60 publishes a new guide article. That page starts with a PA close to zero, because nothing links to it yet. It does not automatically rank along with the domain, however strong the domain is - a very widespread misconception.
2. Weak domain, strong single page. A small blog with DA 15 has one article that is cited a lot. Its PA can be well above the domain value - and the page ranks better for its keyword than the domain would suggest.
3. Judging link sources. A link from a domain with DA 70 is worth little if it sits on an orphaned subpage with PA 3 that receives no links itself. For judging a concrete link opportunity, Page Authority is the more meaningful number.

As a rule of thumb: Domain Authority answers "how strong is this provider overall?", Page Authority answers "can this one page rank for my keyword?". For keyword planning the second question is the more important one, because in search results pages compete against pages, not domains.

The most effective lever for Page Authority is not external link building but internal linking: it distributes the existing strength of a domain onto the subpages that are supposed to rank. Anyone publishing a new page and linking to it from strong existing pages raises its Page Authority without a single new external link.

How is Domain Authority calculated?

The exact formulas are a trade secret at every provider. The inputs are known, though, and similar everywhere:

• number of referring domains (not of individual links)
• strength of the linking domains - a link from a strong domain weighs many times more
• topical proximity between the linking and the linked page
• ratio of follow to nofollow links
• detected spam signals in the link profile

Decisive for understanding the metric is its logarithmic scale. The effort per point rises exponentially:

DA 10 → 20: reachable with a handful of good links. DA 70 → 80: requires links that otherwise only brands and news sites receive.

A jump from 15 to 25 is realistic for a young site. A jump from 60 to 70 hardly succeeds through optimisation, only through genuine recognition.

What is a good Domain Authority?

There is no absolute target value - the metric is only meaningful compared within one industry. As rough orientation:

• 1–20: new domains, small projects, sites without a link profile worth mentioning
• 20–40: established niche sites and specialist blogs with a grown link profile
• 40–60: well-known providers, larger shops, specialist portals with reach
• 60+: brands, large media outlets, portals with national recognition

The only sensible question is therefore not "is my value good?" but "how do I compare with the domains that rank for my keywords?". If the first ten search results sit at 55 and your own domain at 12, that is a realistic hint that short-term rankings for this keyword are unlikely - an argument for working on OnPage topics and on less contested search terms.

Domain Authority and visibility index are not the same

The two values are frequently confused, but they measure opposite things:

• Domain Authority measures the potential of a domain and derives it from link data.
• The visibility index measures the outcome: actual rankings, weighted with the search volume of the keywords.

For the question "how is my site doing right now?" the visibility index is the more honest metric, because it goes back to real positions. Domain Authority, by contrast, is useful when no rankings exist yet - for instance when judging someone else's domain as a possible link source.

What the metric is good for - and what not

Sensible use cases:

1. Judging link sources: is a guest article on this domain worth the effort?
2. Competitive analysis: how strong are the domains you are up against?
3. Prioritisation: which keywords are reachable at all with the current link profile?
4. Domain purchase: assessing an existing domain before taking it over.

What Domain Authority is unsuitable for is being a target KPI for your own work. Whoever makes the value itself the goal optimises for a third party's estimate instead of for revenue, conversions or visibility. Nor can the value be lifted permanently through bought links from link farms - spam detection is part of the calculation at every provider, and Google devalues such profiles anyway.

What does not influence Domain Authority

A widespread misunderstanding concerns the role of visitor numbers. Authority scores are calculated from link data - not from traffic. The following factors therefore have no direct effect on Domain Authority:

• number of visitors or page views
• bounce rate, dwell time and other usage signals
• the age of the domain in itself
• likes, shares and reach on social networks
• bought advertising of any kind

These factors work indirectly: content that many people see gets cited and linked more often - and it is links that move the value. The route is always the indirect one, never the direct one.

How to improve your Domain Authority

Because the metric essentially maps the link profile, improving it means clean link building:

1. Create linkable content: studies, calculators, tools and overviews get linked, product pages rarely do.
2. Watch referring domains, not link count: ten links from ten domains weigh more than a hundred links from one.
3. Look for topical proximity: a link from your own field is worth more than one from a random directory.
4. Tidy up internal linking: it distributes existing strength onto the subpages.
5. Check for harmful links: watch for conspicuous patterns in the link profile and disavow them if in doubt.
6. Plan for patience: the providers only recalculate their values at intervals of weeks.

Reach is the precondition for backlinks

An honest classification belongs here: bought visitors do not lift an authority score. Anyone booking traffic in order to reach a higher Domain Authority will be disappointed - the metric knows no visitors, it only knows links.

What reach does deliver is the first step in the chain: only what someone has read gets linked. A well-researched article that 40 people see in three months collects no links - not because it is bad, but because nobody knows it exists. That is exactly where eBesucher comes in: through the surfbar or a click campaign, new content can be put in front of people predictably instead of waiting for rankings that will not come without links.

With the audience filters you can narrow down who gets to see the page - by country, language, browser or operating system. For link building that is the practical advantage: reach inside your own language region instead of scatter loss. The linking itself has to be earned by the content, but without readers it never gets the chance.

Summary

• Domain Authority is a third-party estimate, not a Google metric.
• It is based almost entirely on the backlink profile and is scaled logarithmically.
• Page Authority is the page-level counterpart - for the question of whether a single URL can rank, it is the more meaningful number.
• It is only meaningful in a direct comparison with competitors inside the same tool.
• As a target KPI it is unsuitable - as a selection criterion for link sources it is useful.
• Visitor numbers do not lift the value, but they create the precondition for content being linked at all.