Ahrefs URL Rating (UR) shows the strength of a given URL’s backlink profile. Among all the SEO metrics, UR has the highest correlation with Google rankings.
Ahrefs Domain Rating (DR) shows the strength of a given website’s backlink profile. This metric is useful for link building purposes. As a general rule, backlinks from high-DR websites carry more "link juice".
Both UR and DR metrics are measured on a scale from 1 to 100, with higher scores having stronger ratings. Please note that the scale is logarithmic — meaning it's much easier to grow your page from UR 10 to UR 20 than from UR 80 to UR 90.
Ahrefs Rank (AR) is a list of all websites in our database ordered by the size and quality of their backlink profiles — basically, by their DR. Ahrefs Rank shows how strong a website’s backlink profile in comparison to other websites — with AR of 1 being the strongest.
You may read more on these and other Ahrefs metrics in our blog post.