Website SEO rating
Domain Authority (DA) is a score developed by Moz that predicts how well website will rank on search engine result pages (SERP). Domain Authority scores range from one to 100, with higher scores corresponding to a greater ability to rank.
We calculate Domain Authority combining many of our other link metrics — linking root domains, number of total links, MozRank, MozTrust, etc. — into a single DA score. This score can then be used when comparing one site to another or tracking the "ranking strength" of a website over time.
To help Domain Authority calculations approximate actual ranking positions, we employ machine learning against Google's algorithm to best model how their search engine results are generated.
How is Domain Authority scored?
We score Domain Authority on a 100-point, logarithmic scale. Thus, it's significantly easier to grow your score from 20 to 30 than it is to grow from 70 to 80.
What is a "good" Domain Authority?
Generally speaking, sites with a very large number of high-quality external links (such as Wikipedia or Google.com) are at the top end of the Domain Authority scale, whereas small businesses and websites with fewer inbound links may have a much lower DA score. Brand new websites will always start with a Domain Authority score of one.
Because of how Domain Authority is calculated (see "Technical definition of Domain Authority" below), it's best used as a comparative metric (rather than an absolute, concrete score) when doing research in the search results and determining which sites may have more powerful/important link profiles than others. Because it's a comparative tool, there isn't necessarily a "good" or "bad" Domain Authority score.