What is Domain Authority?

MDomain Authority represents SEOmoz's best prediction about how a website will perform in search engine rankings. Use Domain Authority when comparing one site to another or tracking the “strength” of your website over time. SEO Moz calculates this metric by combining all of our other link metrics (linking root domains, number of total links, mozRank, mozTrust, etc.) into a one single score.

To determine Domain Authority, SEO Moz employs a machine learning against Google's algorithm to best model how search engine results are generated. Over 150 signals are included in this calculation. SEO Moz constantly refines this model over time. This means your website's Domain Authority score will often fluxuate. For this reason, it's best to use Domain Authority as a competitive metric against other sites as opposed to a historic measure of your internal SEO efforts.

How is Domain Authority Scored?

SEO Moz scores Domain Authority on a logarithmic scale ranging from 0 to 100-points. Thus, it's far more challenging to grow your score from 70 to 80 than it would be to grow from 20 to 30.

Domain Authority vs. Page Authority

Whereas Domain Authority measures the predictive ranking strength of entire domains or subdomains, Page Authority measures the strength of individual page. The same is true for metrics such as MozRank and MozTrust.

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