What Is Domain Authority? A Founder's Practical Guide
Key takeaway
Domain Authority (DA) is a third-party metric built by Moz that scores a website from 1 to 100, predicting how likely it is to rank in search results based on the quantity and quality of backlinks pointing to it. It is not a Google metric, it does not factor into any search engine's ranking algorithm, and the scale is logarithmic — jumping from 20 to 30 takes far less link-building effort than jumping from 70 to 80. Treat it as a rough, comparative gauge of link profile strength, not a report card on your SEO.
Key takeaways
- DA is a Moz-specific prediction model, not something Google reads or uses to rank pages.
- The scale is logarithmic, so equal point gains get exponentially harder as the score climbs — DA 15 to 25 and DA 55 to 65 are not comparable efforts.
- Comparing DA across niches is close to meaningless; a DA 25 site can outrank a DA 60 site for its own keywords every day of the week.
Where the score actually comes from
Moz built Domain Authority by training a machine-learning model on its own link index, trying to find the combination of link signals that best correlates with search ranking positions. It looks at things like the number of linking root domains, the authority of those domains, and how "spammy" the link profile looks overall, then compresses all of that into a single number. Moz's own documentation is explicit that DA is a prediction, not a guarantee, and that it can shift whenever Moz recrawls the web and retrains the model — which happens roughly monthly, meaning your score can move even if you changed nothing on your site.
That last part surprises a lot of founders. A DA drop from 32 to 29 usually isn't a penalty against your site — it's the model recalibrating against everyone else's link growth. If competitors added links faster than you did, your relative score falls even though your backlink count stayed flat.
Why treating it as a Google ranking factor backfires
Google has stated repeatedly, through its own developer documentation, that it does not use third-party metrics like Domain Authority in ranking. Google Search Central describes ranking as the output of hundreds of signals evaluated together — content relevance, page experience, freshness, and link signals Google calculates itself, none of which is "DA."
Here's what actually breaks when founders chase the number anyway: they buy links from private blog networks or link farms that inflate DA within weeks, because Moz's model rewards raw link volume from indexed domains. Google's spam-detection systems, including the SpamBrain system it has described in its search spam policies, are built specifically to devalue or penalize exactly that pattern. So you end up with a healthier-looking Moz score and a search-console warning at the same time — a worse outcome than doing nothing.
What a "good" domain authority score looks like
There's no universal good number, because DA is only meaningful relative to the sites you're actually competing against for rankings. That said, some rough anchors help:
- Brand-new domains start at DA 1, sometimes lower once penalized.
- Most established SaaS blogs and indie hacker sites sit somewhere in the 15–35 range after a year or two of consistent publishing and a handful of earned links.
- Major publishers and reference sites (think large news outlets or Wikipedia) sit near 90–100, but that ceiling is nearly irrelevant to a startup — you're not competing with Wikipedia for your keywords anyway.
The number worth tracking isn't your absolute DA, it's your DA relative to the five or six sites currently occupying page one for your target queries. If they're all clustered around DA 25 and you're at DA 18, that's a useful signal about how much link-building lift you might need. If they're at DA 70, no amount of realistic link building closes that gap quickly, and your time is better spent finding a less contested angle.
Domain Authority vs. Domain Rating vs. actual ranking signals
Ahrefs runs a comparable metric called Domain Rating (DR), built on its own separate link index with its own scoring formula. DA and DR numbers for the same site are routinely different — sometimes by 15-20 points — because the two tools crawl different slices of the web and weight links differently. Neither number is "more correct"; they're just not interchangeable, so quoting your DA to a partner who's used to DR (or vice versa) creates confusion for no reason.
The signals that actually move rankings in Google are broader than any single link score: topical relevance to the query, demonstrated expertise on the subject, how well the page satisfies search intent, page speed and mobile usability, and yes, backlinks — but as calculated by Google's own systems, not Moz's or Ahrefs'. A page can rank with zero external backlinks if it answers a specific, underserved query better than anything else indexed. We see this constantly with long-tail how-to content: a well-structured guide can outrank a DA-heavier competitor simply because it matches the query more precisely.
What actually moves the needle instead
If chasing the score itself is a dead end, the underlying mechanism — earning real links from real sites — still matters, because it's a genuine (if imperfect) proxy for how much of the web trusts and references you. The reliable ways to build that trust:
- Publish something worth linking to. Original data, even a small survey of 50-100 of your own users, gets referenced by other writers in a way that generic advice posts never do — see how to use data studies to earn backlinks for the mechanics of turning a small dataset into a linkable asset.
- Get named, not just linked. Case studies, testimonials, and specific customer numbers give journalists and bloggers a concrete thing to quote — this is the core idea behind using social proof in content that gets cited.
- Fix the parts of your site nobody thinks of as "SEO." A well-organized help center accumulates internal links and long-tail traffic that compounds over years; see how to structure a help center for SEO.
None of these directly targets a DA number. All of them target the actual thing DA is trying to approximate: whether other sites and readers find you worth referencing.
Does domain authority matter for AI answer engines?
This is the question we get most at Seolyn, because it's genuinely different from classic SEO. Tools like ChatGPT, Perplexity, and Google's AI Overviews decide what to cite based on how directly and specifically a page answers the query in front of them right now — not on a cached third-party authority score. A DA 20 startup blog with a precise, well-sourced answer gets quoted over a DA 60 site with a vague, SEO-padded paragraph, because the generative model is pattern-matching for extractable, quotable text, not crawling your backlink profile.
That doesn't make link building irrelevant to GEO — links still correlate loosely with how much of the training and retrieval data mentions you, and citation-heavy AI answers often draw from sites that already rank well organically. But the more direct lever is writing content structured so an AI system can lift a clean, self-contained answer out of it, which is a different discipline than accumulating links. If you're building pages specifically for that goal, optimizing a SaaS homepage for AI search covers the structural choices that matter more than any authority score.
How to check your own score
Moz offers a free Link Explorer tool and a browser extension (MozBar) that shows DA for any page you're viewing, including competitors'. Check it quarterly, not weekly — because the model only updates periodically, checking more often just shows you noise, not progress. Track the trend line over two or three quarters rather than reacting to single-point movements; a one-point drop the week after a Moz index refresh is not a sign your SEO regressed.
Frequently Asked Questions
Q: What is considered a good domain authority score for a new SaaS website?
There's no fixed threshold, but most new SaaS sites sit under DA 20 in their first year. What matters more is your DA relative to the sites currently ranking for your target keywords, not the absolute number.
Q: Can you increase domain authority quickly?
Not legitimately and not safely. DA rises as your backlink profile grows in quality and quantity over months, and shortcuts like bulk-purchased links tend to trigger Google's spam systems long before they meaningfully move the score.
Q: Is domain authority the same thing as Google PageRank?
No. PageRank is Google's own internal signal, never publicly scored anymore, while Domain Authority is Moz's separate, third-party estimate built from Moz's own link index and machine-learning model.
Q: Does a low domain authority mean my page can't rank in Google?
No. Pages with low DA regularly outrank higher-DA competitors when they match search intent more precisely, especially for specific, long-tail queries with less competition.
Q: How often does my domain authority score change?
Moz recalculates DA roughly on a monthly cadence as it recrawls the web and retrains its model, so scores can shift even without any changes to your own site.
Want content like this on autopilot?
Seolyn researches keywords, writes the articles, and publishes on a schedule. The first one is written the moment you create a site.