If you’ve been in SEO for more than five minutes, you’ve heard someone throw around the term “domain authority” like it’s gospel. And here’s the blunt truth: it’s a third-party metric that Google doesn’t even use. Yet it still moves budgets, kills deals and shapes content strategies every single day. So let’s cut through the noise and talk about what domain authority actually is, how it’s measured, and why you should care — but not too much.
Domain authority is a score, usually from 1 to 100, developed by Moz back in 2008 to predict how likely a website is to rank in search engine results. Ahrefs has its own version called Domain Rating, and SEMrush uses Authority Score. They all try to do the same thing: estimate the strength of a domain’s backlink profile.
The key point most people miss is that domain authority is not a Google ranking factor. Google has never confirmed using it, and John Mueller has repeatedly said Moz’s metric is not something they look at. It’s a comparative tool, not an official grade.
That said, domain authority correlates strongly with rankings because it’s built on the same raw material Google cares about: links. A site with a high domain authority usually has a lot of quality backlinks, and that’s why it tends to rank well. Correlation, not causation.
Moz’s domain authority is calculated using machine learning that looks at dozens of signals, but the biggest ones are the number of linking root domains and the total number of backlinks pointing to your site. The more unique domains link to you, the higher your score climbs.
Link quality matters too. A single link from a respected news site like The New York Times can do more than a hundred links from random blog comment sections. Moz also factors in things like spam signals and how links are distributed across the site.
One thing that trips people up: domain authority is logarithmic. Going from 20 to 30 is relatively easy. Going from 70 to 80 might take years. The closer you get to 100, the harder each point becomes.
If you want to know how to measure the authority of a website, you have three main options that dominate the market right now: Moz, Ahrefs and SEMrush. Each one gives you a slightly different number, so don’t panic if Moz says 45 and Ahrefs says 38. They’re measuring different things with different data sets.
- Moz: The original. Domain Authority (DA) and Page Authority (PA). Great for benchmarking against competitors.
- Ahrefs: Domain Rating (DR). Probably the most accurate these days because their crawler is massive.
- SEMrush: Authority Score. Combines backlinks with organic traffic estimates, which gives a more well-rounded picture.
My honest take: use Ahrefs as your primary metric, Moz as a secondary reference, and SEMrush if you want to combine authority with traffic data. Don’t obsess over any single number.
Even though Google doesn’t use domain authority, it’s still useful for competitive analysis. If you’re trying to rank a page about “best coffee grinders” and the top ten results all have domain authority above 70, you know you’re in for a fight.
Domain authority also helps you prioritize link building. If you’re pitching guest posts, a site with DA 60 is worth more effort than one with DA 15. And when you’re evaluating potential partners or buying domains, DA gives you a quick sanity check.
But here’s the nuance: a high domain authority doesn’t guarantee traffic. I’ve seen sites with DA 55 that get less organic traffic than sites with DA 25. Authority is potential, not performance.
You can’t improve domain authority overnight. Anyone selling you a shortcut is lying. The only real way is to earn more links from more unique, reputable domains over time.
Start with content worth linking to. Not fluff — real data, original research, tools, or strong opinions. Then promote it. Outreach, digital PR, guest posting on relevant sites. The boring stuff works.
Also, clean up your link profile. Disavow toxic backlinks if you’ve been hit by negative SEO. And make sure your technical SEO is solid so that when links come in, they actually pass value.
Domain authority is a compass, not a destination. Use it to orient your strategy, but never let it dictate your decisions.
Some SEOs love to say domain authority is irrelevant because Google doesn’t use it. That’s technically true but practically shortsighted. The links that drive DA are the same links that drive rankings.
What is true is that DA shouldn’t be your only metric. Track organic traffic, keyword rankings, conversion rates and revenue. Those are the numbers that pay the bills.
So in 2026, treat domain authority as one piece of the puzzle. A useful piece, but not the whole picture. Measure it, benchmark it, improve it gradually — and then go build something people actually want to link to.
