Domain Authority Checker

A domain authority checker gives you a single number that estimates how likely a whole website is to rank in search. It is a useful shorthand, but only if you understand what it does and does not mean. This guide explains how these checkers work, which free ones to trust, and exactly what to fix when the score comes back lower than you hoped.

What a domain authority checker actually measures

Domain authority is a predictive score invented by SEO software companies to estimate how well a domain is likely to perform in organic search. Moz popularised the term with its Domain Authority metric, scored from 1 to 100, where a higher number suggests a stronger ability to rank. Ahrefs calls its equivalent Domain Rating, Semrush uses Authority Score, and Majestic uses Trust Flow and Citation Flow. Each is calculated from that vendor's own crawl of the web, mostly from the size and quality of a site's backlink profile.

The single most important thing to understand is that these are estimates built by third parties. Google's John Mueller has repeatedly stated that a domain authority ranking signal is not in use at Google, and that Google does not calculate or rely on any such site-wide score to rank individual pages. You can read a clear summary of his position in Search Engine Journal's write-up of the topic. In other words, a checker tells you how one vendor models your site's strength, not how Google grades you.

That does not make the number useless. Because these scores correlate reasonably well with real ranking ability, they are a fast way to benchmark yourself, size up a competitor, or vet a site before you pursue a link from it. Just treat the figure as a compass, not a verdict.

How to read the score you get back

Scores use a logarithmic scale, which matters more than most people realise. Climbing from 20 to 30 is far easier than climbing from 70 to 80, because the top of the range is crowded with the most established sites on the internet. A brand new site often sits in the single digits or low teens, and that is completely normal.

When you run a check, look past the headline number at the supporting data:

• Linking root domains: how many unique websites link to you. This usually matters more than the raw count of backlinks.
• Backlink quality: a handful of links from respected, topically relevant sites beats hundreds of links from low quality directories.
• Spam or toxicity signals: most tools flag suspicious link patterns that can drag a profile down.
• Your competitors' scores: a 35 is strong in one niche and weak in another, so context is everything.

If you want to understand the raw links feeding that number, pair a domain authority check with a dedicated backlinks checker so you can see the actual referring pages, not just the aggregate.

Free tools that report domain authority honestly

404Pulse does not sell a proprietary authority score, and you should be wary of any site that claims a secret formula better than Google's. Instead, use the established free tiers from the companies that created these metrics:

• Moz Link Explorer reports Domain Authority and Page Authority with a limited number of free queries per month after you create an account.
• Ahrefs Website Authority Checker is a free tool that returns Domain Rating for any URL you enter, no account required.
• Semrush shows an Authority Score inside its free plan and its free browser extension.
• Google Search Console does not report authority, but it is the ground truth for how Google actually sees your site, and it is completely free. Google describes it as a free service to monitor and troubleshoot your presence in search in its official Search Console overview.

Run the same URL through two or three of these and you will get three different numbers. That is expected. Pick one tool as your reference and stay consistent, because the trend within a single tool is far more meaningful than a comparison across tools.

Fixing a low score: the backlink profile

Because links dominate every authority calculation, your link profile is the biggest lever. Focus on earning links rather than buying or trading them:

• Publish genuinely useful reference content that other people in your field want to cite.
• Reclaim unlinked brand mentions by asking sites that name you to add a link.
• Pursue relevant guest contributions and expert commentary on reputable industry sites.
• Fix or reclaim lost links: if a page that linked to you moved or broke, a quick email often restores it.

Quality and relevance beat volume every time. Ten links from respected sites in your industry will move the needle more than a thousand from unrelated blogs. For a full playbook, see our guide to link building and the deeper reference on backlinks.

Fixing a low score: content and topical depth

Authority follows relevance. Sites that cover a subject thoroughly tend to attract more natural links and rank for more terms, which in turn lifts the estimated score. Build clusters of related articles that interlink, so search engines and readers can see the depth of your coverage. Target the questions your audience actually asks, and keep older pieces refreshed rather than letting them go stale. A strong internal linking structure also spreads authority from your best pages to newer ones.

Fixing a low score: technical health

Technical problems can suppress the underlying performance a score is trying to predict. Two issues do the most damage. First, broken links and dead pages waste the authority you have earned. When a URL returns a 404 Not Found response, as documented by MDN, any links pointing to it stop passing value. Redirect or restore those pages so the equity is not lost. Our guide on 404 errors and how to fix them walks through the process.

Second, slow or unstable pages hurt the experience that Google measures. Run your key pages through PageSpeed Insights and aim to pass Core Web Vitals. If you need help interpreting those metrics, our Core Web Vitals guide breaks them down.

Domain authority versus page and site authority

Domain authority estimates the whole domain, but most tools also publish a page level score, sometimes called Page Authority or URL Rating, that predicts how a single URL can rank. A homepage might score high while a thin blog post scores low. When you plan work, use the domain figure for big picture benchmarking and the page figure to decide which individual URLs need links or content upgrades. For the broader concept across different tools, see our companion piece on the site authority checker, and if you rely specifically on Moz, our review of the Moz domain authority checker compares it against free alternatives.

Frequently asked questions

Is domain authority a Google ranking factor?

No. Domain authority is a third party metric created by SEO tools such as Moz, Ahrefs and Semrush. Google has stated repeatedly that it does not use any domain authority score to rank pages. It is a useful benchmarking estimate, not something Google reads.

What is a good domain authority score?

There is no universal cutoff, because the score is logarithmic and niche dependent. A new site often scores in the single digits, established sites commonly sit between 30 and 60, and the largest global brands push into the 80s and 90s. Judge your score against your direct competitors rather than an absolute target.

Why do different checkers give me different numbers?

Each tool calculates its own metric from its own crawl of the web, so Moz Domain Authority, Ahrefs Domain Rating and Semrush Authority Score will rarely match. Pick one tool as your reference and track the trend inside it, since the direction of travel matters more than the exact figure.

How long does it take to raise domain authority?

Expect months, not days. Authority reflects accumulated links and content, both of which take time to earn and for the tools to recrawl. Focus on steadily earning relevant links and publishing strong content, and the score will follow.

Can I increase domain authority for free?

Yes. The inputs that move the score, quality content, earned links, clean technical health and a sensible internal linking structure, are all things you can improve without paid tools. Free tiers from Moz, Ahrefs and Semrush let you measure progress, and Google Search Console shows how Google actually sees your site.