Page Authority (PA) is a score that predicts how well a certain page ranks on search engine results pages (SERP). Page Authority values vary from 1 to 100, with higher values that match better ratings. It is a score developed by Moz.
Page Authority is calculated using data from our web index and takes hundreds of criteria into account. Domain Authority employs a machine learning model to determine the formula that best correlates with ranks across the hundreds of SERPs against which we forecast and then generates Page Authority ratings based on that specific calculation.