A site showing Domain Authority 70 can still deliver less real SEO value than a site scoring 40, because DA is a third-party prediction built from backlink data, not a direct Google ranking factor, and it can be manipulated. RankZ’s 2026 research found that sites with artificially inflated authority scores relative to their actual organic traffic are increasingly common across the guest posting and link-building industry, which makes understanding what Domain Authority actually measures essential before making any SEO decision based on it.
Domain Authority is a metric developed by Moz, scored from 1 to 100, that predicts how likely a website is to rank in search engine results based primarily on the size and quality of its backlink profile. It is one of several third-party authority metrics used across SEO, alongside Ahrefs’ Domain Rating and Semrush’s Authority Score, and none of them are used directly inside Google’s own ranking algorithm.
How Domain Authority Is Calculated
Moz calculates Domain Authority using a machine learning model trained on how well sites with certain backlink characteristics actually rank in Google search results. The model weighs factors including the total number of linking root domains, the quality and authority of those linking domains, and the overall structure of the site’s backlink profile. Because the score is logarithmic, moving from DA 20 to DA 30 is meaningfully easier than moving from DA 70 to DA 80.
Domain Authority vs Page Authority vs Domain Rating
| Metric | Provider | What It Measures |
| Domain Authority (DA) | Moz | Ranking potential of an entire domain, scored 1 to 100 |
| Page Authority (PA) | Moz | Ranking potential of one specific page, scored 1 to 100 |
| Domain Rating (DR) | Ahrefs | Strength of a domain’s backlink profile, scored 1 to 100 |
| Authority Score | Semrush | Composite score combining backlink and traffic data |
These metrics correlate with each other but are not identical, since each provider crawls a different slice of the web’s link graph and weighs signals slightly differently. A site can legitimately show DA 45 and DR 55 at the same time; neither number is wrong, they are simply different models measuring a similar concept.
Why Domain Authority Matters for Guest Posting and Link Building
Domain Authority functions as a quick filter when evaluating dozens of potential guest posting or link-building targets, helping prioritize outreach time toward sites more likely to pass real authority to your own domain. It should never be the only filter, since T-RANKS’ 2026 guest post pricing research recommends checking DA alongside real organic traffic, topical relevance, and spam score before pitching or paying for any placement.
Authority scores are a useful shorthand, but genuine topical relevance and a real readership matter just as much in practice. WritoryBuzz maintains a checkable, real audience across technology, fintech, AI, and business content, which is the kind of signal worth confirming on any site before you build outreach around its DA number alone.
How to Improve Your Own Domain Authority
Domain Authority rises over time as a site earns backlinks from other reputable, relevant sites, most commonly through guest posting, digital PR, and genuinely link-worthy content like original research or data studies. There is no way to raise DA directly since it is a lagging indicator that Moz recalculates periodically based on newly crawled data, which means the real work is earning links, not chasing the metric itself.
