Domain Authority Checker

Estimates a website's relative ranking potential based primarily on backlink data, using a proprietary third-party score, typically on a 0–100 or 1–100 scale.

If you have ever picked a high-scoring domain that still failed to rank, you already know the number alone is not the whole story.

Key points

Authority scores are relative, so compare your score against competitors, not in isolation.
Treat domain authority as a benchmark, not a Google ranking factor.
Check backlink quality, relevance, and organic performance before acting on the score.
Never compare scores from different tools — they use different formulas and inputs.
A low score does not guarantee a site is unwinnable, but a high score does not guarantee rankings either.
Monitor score changes over time, but expect shifts when the tool updates its model or index.

Three domains, two tools, one keyword

You vet link prospects for a vegan recipes site. Site A has Moz DA 72, Site B 58, Site C 45. Ahrefs DR for those sites is 68, 61, and 39. The two tools disagree on the strongest site. Checking backlink profiles: Site A and B have spammy links from low-quality directories, while Site C has fewer links from authoritative food blogs. Page authority on Site C's recipe page is also higher. You pick Site C and rank for the target keyword within three weeks.

Three things it is not

Not a Google metric Google does not publish or use domain authority scores. Treating DA as a ranking factor is a common mistake.
Not interchangeable across tools Moz Domain Authority, Ahrefs Domain Rating, and Semrush Authority Score each use different data, calculations, and scale ranges. A score of 60 on one tool may be a 45 on another.
Not a ranking guarantee A high score does not guarantee rankings. You still need relevant content, good on-page SEO, and a healthy backlink profile.

Four ways it can mislead

Score drift after updates When a tool refreshes its index or machine-learning model, your DA can shift without any change in your backlinks.
Niche distortion Thin sites or spam-heavy niches can inflate scores, making a low-quality domain look strong. In competitive niches, even mediocre sites can accumulate enough links to push the score higher than it deserves. Always check the backlink profile before judging a domain.
No context on link quality A high DA can come from many low-quality links. Always check the domain rating and review backlink quality manually.
Ignores organic performance The score does not reflect traffic, rankings, or user engagement. A site with high DA but low organic traffic may have a weak content strategy or rely on expired domain tricks. Combine authority scores with actual ranking data from a tool like Semrush or Ahrefs.

Three checks before you act on a score

Compare to direct competitors A DA of 45 means little alone. Check what score your top three ranking competitors have to set a realistic benchmark.
Review the backlink profile Use a da checker to see referring domains and link quality. A handful of strong links beat hundreds of weak ones.
Check organic traffic data A high authority score with low organic traffic suggests the site may have a weak content strategy or spam signals.

Common questions

How to increase domain authority?

Improve your backlink profile by earning links from authoritative, relevant sites. Publish quality content and fix internal linking. Focus on earning relevant links from trusted domains.

What is a good domain authority score?

A good score is relative to your niche. For most small sites, a DA of 40–50 is respectable; for competitive industries, you may need 60+.

Is there a free domain authority checker?

Yes, Moz offers a free DA checker on its domain analysis page, limited to a few lookups per day. Ahrefs and Semrush also have free versions.

Sources

Moz Domain Analysis / Free Domain Authority Checker Official Moz DA checker with free daily lookups
Semrush Website Authority Checker Semrush free tool for checking Authority Score
Ahrefs Website Authority Checker Ahrefs free tool for checking Domain Rating