Page Authority (PA)
A proprietary Moz score, expressed on a logarithmic 1–100 scale, that predicts the relative likelihood of a specific web page ranking in search results.
PA can support comparative link analysis, internal benchmarking, and prioritization of pages for digital PR or internal linking. It should be considered alongside actual rankings, traffic, relevance, technical quality, and conversions.
An SEO team compares PA across a set of product guides to identify pages with relatively weak link equity, then reviews internal-link opportunities and external promotion while monitoring real search performance.
Page Authority is not a Google metric or confirmed ranking factor. It is best used for relative comparison within the same tool and time period. Scores from Moz cannot be directly compared with metrics from other vendors.
Moz calculates Page Authority with a machine-learning model using signals from its link index. Unlike Domain Authority, which estimates performance at domain level, PA applies to an individual URL. Because the model and link index are updated, scores can change even when the page itself has not been modified.
Data Engineering, Performance Advertising
Moz — Page Authority — https://moz.com/learn/seo/page-authority