Domain Authority (DA) is a metric created by Moz that predicts how likely a website is to rank on search engine results pages. Domain Rating (DR) is a metric created by Ahrefs that measures the strength of a website's backlink profile. Both run on a logarithmic scale from 0 to 100. Neither is a Google ranking factor. If you have seen both scores floating around in SEO conversations and wondered whether they measure the same thing, the short answer is: they do not.
This post breaks down what each metric actually measures, how each one is calculated, what a good score looks like depending on where your site is in its growth, and how to use DA and DR together without over-relying on either number.