What is a good domain authority score?

There is no absolute threshold. The only comparison that means anything is against the sites competing with you in the same search results. In a local service niche 25 may be comfortably enough, while in international news 60 can still be low.

Why is my score different from the one Moz shows?

Every tool builds its own link index with its own crawler and applies its own formula. The score on this page comes from an independent link index, not from Moz Domain Authority. The two numbers are not expected to agree.

Does domain authority directly determine Google rankings?

No. Google publishes no such score and does not say it uses one. Metrics like this are third party estimates of backlink strength, and they show only a statistical correlation with rankings.

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Domain Authority Checker

Measure the authority a domain earns from its backlink profile on a 0 to 100 scale. Up to 10 domains at once, with referring domain and backlink counts.

Visitors get 5 checks a day, members get 25. Results are cached for 7 days, so asking about the same address again costs you nothing.

What is domain authority?

Domain authority compresses two things into one number: how many other sites link to a domain, and how much weight those sites carry themselves. The logic goes back to Google's original PageRank formula, where a link from a strong site counts for more than a link from a weak one. That is why 20 strong referring domains can outscore 2,000 weak ones. The number is not a Google ranking signal. Google publishes nothing of the sort. Scores like this are third party estimates whose correlation with rankings has been measured but never confirmed by Google.

Is this Moz Domain Authority?

No, and we would rather say so plainly. "Domain Authority" is a term Moz trademarked, and it comes only out of Moz's own link index. The number on this page comes from an independent link index, gathered by a separate crawler network and scored on the logic of Google's original PageRank formula. Moz, Ahrefs, Semrush and this tool will all report different figures for the same site, because none of them can see each other's index. The sound practice is to pick one tool and compare within it. Carrying a number from one tool into another is misleading.

What moves the score?

Three things move it: the number of distinct domains linking to the site, how much authority those domains hold, and how stable that profile stays over time. Because the scale is logarithmic, the first steps come quickly and the upper ones very slowly. In practice the score is an outcome rather than a target. Publish work other people choose to cite and the number follows. Google's spam policies prohibit buying links and participating in link schemes outright, and a number built that way is neither durable nor safe.

Frequently asked

What is a good domain authority score?: There is no absolute threshold. The only comparison that means anything is against the sites competing with you in the same search results. In a local service niche 25 may be comfortably enough, while in international news 60 can still be low.
Why is my score different from the one Moz shows?: Every tool builds its own link index with its own crawler and applies its own formula. The score on this page comes from an independent link index, not from Moz Domain Authority. The two numbers are not expected to agree.
Does domain authority directly determine Google rankings?: No. Google publishes no such score and does not say it uses one. Metrics like this are third party estimates of backlink strength, and they show only a statistical correlation with rankings.