Page Authority
Moz's 1–100 score predicting how well a specific page (not the whole domain) will rank in search results.
Definition
Page Authority (PA) is a proprietary Moz metric that predicts how well an individual web page will rank in search results, on a 1–100 logarithmic scale. Where Domain Authority assesses the entire domain's link profile strength, Page Authority focuses specifically on the individual URL's backlink equity. The distinction matters for SEO strategy: two pages on the same domain can have very different PA scores based on the links pointing specifically to each page versus the domain overall.
PA is calculated using the same link data as DA (quantity and quality of linking domains to the specific URL) but applied at the page level. It is influenced by factors including: the number of external domains linking to the exact URL, the authority of those linking pages, the anchor text distribution, and any internal link equity flowing to the page from within the site.
For content strategy, PA is useful for identifying which pages on your own site have the highest authority (and therefore the most potential to pass link equity to other pages via internal links), and for evaluating the strength of competitor pages you're trying to outrank. As with DA, PA is a proxy metric — a page with PA 40 can outrank a PA 70 page for a specific keyword if it is significantly better optimized for that query's search intent.