What Is Domain Authority (Domain Rating)?
Domain Authority (DA) and Domain Rating (DR) are third-party scores that estimate how strong a website's backlink profile is, expressed on a 0 to 100 scale. Domain Authority is a Moz metric; Domain Rating is the Ahrefs equivalent. Both predict how well a domain can rank based largely on the quantity and quality of sites linking to it. Crucially, neither is a Google ranking factor: they are SEO-industry estimates, useful for comparison rather than as a signal search engines actually use.
How These Scores Work
DA and DR are calculated mainly from a site's backlink graph: how many unique domains link to it, how authoritative those linking domains are, and the overall link structure. The scales are logarithmic, so moving from 20 to 30 is far easier than moving from 70 to 80.
Because the scores are vendor-specific, a site can have different DA and DR values, and the numbers only make sense relative to other sites measured by the same tool. They are best used to compare competitors, gauge the strength of a potential link source, or track a backlink profile over time, not as an absolute measure of quality.
Use Cases
- Competitive benchmarking: comparing your domain's authority score to competitors to gauge how hard a niche is to rank in.
- Link prospecting: evaluating whether a potential backlink source is strong enough to be worth pursuing.
- Progress tracking: watching authority scores trend upward as a link-building and content program matures.
- Bulk evaluation: scoring many domains at once, which requires collecting backlink and ranking data across the web. Large-scale collection depends on crawling reliably without blocks, where clean residential IPs and a rendering service keep the data complete.
Frequently Asked Questions
No. Domain Authority and Domain Rating are third-party metrics from Moz and Ahrefs, not signals Google uses. Google has confirmed it has no single "domain authority" score. The metrics are useful estimates for comparison, not direct ranking inputs.
They measure similar things (the strength of a backlink profile) but come from different tools. Domain Authority is Moz's metric and Domain Rating is Ahrefs'. Their numbers are not interchangeable, so compare sites using one tool consistently.
It is relative to your niche. Rather than chasing an absolute number, compare your score to the sites you compete with. Outscoring direct competitors matters more than hitting an arbitrary threshold, and the scales are logarithmic, so high scores get exponentially harder.