Similar to Domain Authority, Page Authority is a search engine optimization metric to determine the likelihood, from 1 to 100, of your web page attaining a high ranking in the SERPs (search engine results pages). The term was coined by Moz and derived from a granular version of Google’s PageRank. Other companies, such as aHrefs, maintain their own iteration with different algorithms and names.
How is Page Authority calculated?
Moz defines how their Domain Authority is calculated as:
Page Authority is based on data from the Mozscape web index and includes link counts, MozRank, MozTrust, and dozens of other factors. Like Domain Authority, it uses a machine learning model to identify the algorithm that best correlates with rankings across the thousands of SERPs that we predict against, then produces Page Authority scores using that specific calculation.
Like Domain Authority, Page Authority is primarily calculated by the total number of referring domains, total links, and the rating of those referring pages/domains. A web page’s Page Authority is calculated on a logarithmic scale. This means that as you achieve a higher ranking, attaining the next rank becomes more and more difficult. So, moving from a Page Authority of fifteen to twenty is easier than moving from forty to forty-five.
Is Page Authority more important that Domain Authority?
The simple answer is that there is no truly correct answer to this question. SEOs will debate back and forth on this one question until the end of time. I have seen pages with a high Domain Authority but extremely low Page Authority rank well. I have also seen high Page Authority web pages with a lower Domain Authority rank well.
The key in both Domain Authority and Page Authority is the little word “likeliness”. A website with a high Domain Authority has a higher “likelihood” of having its pages rank well. A web page with a higher Page Authority has a higher “likelihood” of that page ranking higher on the SERPs.
What Page Authority is not
Do not let Page Authority trick you. It is a good metric to keep in mind when looking and the internal structure of your site. For example, your website’s cornerstone pages should carry a high page authority in comparison to the rest of the supporting web pages. Page Authority can also help to determine if a particular backlink has value. Your website’s Page Authority is not the end-all to the health of a web page. It is only one of many SEO metrics that should be considered.