Domain Authority is a third-party SEO metric that estimates how likely an entire website is to rank in search results compared with other sites. It is not a Google ranking factor, but it can still help site owners judge relative link strength, benchmark competitors, and spot where authority gaps may be limiting visibility. For SEO reviews, it is most useful as a directional score rather than a goal on its own.
What Domain Authority measures
Domain Authority, often shown on a 1-100 scale, is designed to predict ranking potential at the domain level. The score is typically influenced by signals such as the number of linking root domains, the quality of inbound links, and the overall strength of the site's backlink profile. Because it is comparative, a score can rise or fall even if your site does not change, simply because the wider link graph changes.
This matters during an SEO check because a low score relative to direct competitors can explain why strong pages still struggle to break into top positions. It can also help separate a link authority problem from an indexing, content, or on-page issue.
How to use it during an SEO review
Use Domain Authority to compare websites competing for the same search terms, not to judge site quality in isolation. A local service site with a score of 18 may perform well in a weak market, while an ecommerce category competing against major retailers may need far stronger authority to rank. The metric becomes useful when paired with page-level checks such as crawlability, internal linking, title relevance, and search intent alignment.
- Compare your site against 3-5 real search competitors.
- Check whether ranking pages have stronger backlink profiles.
- Review if weak authority is the main constraint or just one of several issues.
- Prioritize link earning only after technical and on-page problems are under control.
A practical example
If your product guide sits on a site with a Domain Authority of 22 and the top-ranking competitors are mostly between 45 and 60, that gap suggests link equity may be part of the reason you are stuck on page two. But the next step is not blindly chasing links. First confirm the page is indexable, satisfies the query, uses clear internal anchors, and is not being outranked by better-matched content. If those checks are solid, authority building becomes a more justified priority.
Limits of the metric
Domain Authority should never be treated as a direct ranking score from search engines. A page on a lower-authority site can still outrank stronger domains if it is more relevant, better structured, faster to crawl, or supported by smarter internal linking. For that reason, this metric works best as one checkpoint inside a broader SEO audit. It helps explain competitive strength, but it does not replace checks for indexing status, page quality, content depth, or technical signals.