In our search and enquiries about why some websites with higher backlinks have lower ratings than some other websites with lower amount of backlinks, a staff at ahrefs.com clearifies, comparing 2 websites in their database:
Domain Rating (DR) shows the strength of a website’s backlink profile compared to the others in the database on a 100-point scale. It’s essentially a less granular version of Ahrefs Rank (AR).
Calculating domain rating
When a domain’s DR is higher, more “link juice” is transferred to linked domains.
The source domain splits its rating equally amongst the domains it links to. So, a DR-10 domain which links to three other domains can influence your DR more than a DR-80 domain which links to a million other domains.
After repeating these calculations (for the websites), we get a rating for each domain. The final DR value is then obtained by scaling a computed, absolute value into the 0-100 range.
With that in mind, let’s look at (website 1), if you filter the referring domain on dofollow, it will show 348 results, look decent, however, if you check further, each referring domain is also linking to hundreds of thousands of other dofollow domains thus it greatly dilute the link juice passing over.
If you check (website 2), also it just has 178 dofollow referring domains, but you can find a few high DR RD only link to a thousand or a few thousand, which will transfer more link juice comparing to those referring domains that linking to hundreds of thousands of other RDs
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