What is domain authority (DA and DR)?

Domain authority (DA and DR), explained

SEO tools crawl the web, record who links to whom, and boil that down to one number per domain. Moz calls its score Domain Authority (DA). Ahrefs calls its Domain Rating (DR), which its help page defines as the strength of a website's backlink profile compared with the others in Ahrefs' database, on a 100-point scale. Semrush has its own Authority Score. Each tool uses its own index and formula, so the same site gets different numbers in each.

None of these come from Google. Moz states that Domain Authority is not a metric used by Google in determining search rankings. Google's John Mueller has said the same thing many times over the years. Google has its own ways of weighing links, and it doesn't publish a site-level score.

So why does everyone talk about DR? Because it's a handy shorthand. The scores are relative, and they roughly track how many sites with their own links point to you. That makes them useful for comparing sites, spotting a sudden change, or deciding which directories and publications are worth your time. Ahrefs itself says DR correlates with rankings, which is not the same as causing them.

The problems start when the number becomes the goal. Because DR only counts links, it can be inflated with links that Google ignores or penalizes: link farms, exchange networks, spammy directories. "Increase your DR to 30 in a week" packages sell exactly this. The score goes up; rankings usually don't.

A better way to use these metrics: look at a site's DR together with whether it has real organic traffic, whether it's relevant to your niche, and whether the links it gives are followed. A DR 40 site with real readers in your space beats a DR 70 site that exists to sell links.

Why it matters for founders

Launch platforms, directories and link sellers advertise their DR. It's fine as a rough filter, but it's a vendor's estimate. Buying links to raise it can hurt you with Google, the one system that actually decides your rankings.

Example

Two directories offer to list you. One has DR 75 but no organic traffic and thousands of unrelated listings. The other has DR 35, real search traffic and only products in your category. The second is the better link.

Common mistakes

• Reporting DR to investors as if it were a Google score.
• Buying "DR boost" packages. They inflate a vendor's number, not your rankings.
• Comparing a Moz DA with an Ahrefs DR as if they were the same scale.
• Ignoring relevance and traffic because a site's DR looks high.