So what is domain authority? Domain Authority - DA for short - is a metric created by Moz that predicts how likely a website is to rank in search engine results. It’s scored on a scale from 0 to 100. Higher scores mean stronger ranking potential.

The critical thing to understand upfront is that DA is Moz’s proprietary metric. It is not a Google ranking factor. Google has never used it, confirmed it, or acknowledged it. It’s a third-party prediction tool, nothing more.

That distinction matters because a lot of people - including people who should know better - talk about DA like it’s something Google assigns to your site. It isn’t. Moz built it as a way to estimate ranking strength based on a site’s backlink profile. It’s useful as a comparative benchmark, but treating it as a score you need to “increase” to rank better misunderstands what it actually measures.

How Moz calculates domain authority

DA is built on Moz’s link index, which crawls the web and catalogs backlinks between sites. The calculation uses a machine learning model that considers several factors from your link profile.

Number of linking root domains. How many unique websites link to you. A hundred links from one site count far less than one link each from a hundred different sites. Diversity of your link sources is the heaviest signal.

Total number of backlinks. The raw count of inbound links. This matters less than linking root domains but still factors in. A site with 50,000 backlinks from 10,000 domains will generally score higher than one with 5,000 backlinks from 3,000 domains.

Quality of linking domains. Links from high-DA sites pass more weight than links from low-DA sites. A single link from a DA 80 news outlet is worth more than dozens of links from DA 10 blogs nobody reads. This creates a somewhat circular definition - your DA depends partly on the DA of sites linking to you - but in practice it works as a reasonable proxy for link quality.

Link spam signals. Moz’s model penalizes manipulative link patterns. Sites with link profiles that look artificial - sudden spikes in links, links from known spam networks, excessive exact-match anchor text - get scored down.

The model gets retrained periodically, which means your DA can shift even if your link profile hasn’t changed. A Moz algorithm update can move scores across the board. This catches people off guard - they see their DA drop five points and panic, when really Moz just recalibrated the model.

What DA scores actually mean in practice

The 0-100 scale isn’t linear. Going from 20 to 30 is dramatically easier than going from 70 to 80. Each point gets exponentially harder to earn as you climb. Here’s what different ranges look like in the real world.

0-20: New or very small sites. You just launched, you have minimal backlinks, and nobody’s really linking to you yet. This is where every site starts. A brand new domain with no links is DA 1. A personal blog with a handful of links from friends might sit around 10-15.

20-40: Growing sites gaining traction. You’ve been publishing content, you’ve earned some organic backlinks, and maybe you’ve done some intentional link building. Small businesses, niche blogs, and early-stage startups typically live in this range. You can rank for long-tail keywords and low-competition terms here.

40-60: Established sites with real authority. You have a solid link profile from hundreds or thousands of referring domains. Well-known companies, popular industry blogs, and mid-size publishers fall here. Sites in this range can compete for moderately competitive keywords and will show up consistently in search results for their niche.

60-80: Major players. Large companies, well-known publications, and established brands. Think TechCrunch, HubSpot, or a major university. Getting into this range requires a massive, diverse link profile built over years.

80-100: The biggest sites on the internet. Google, Wikipedia, Facebook, Apple. You’re not getting here unless you’re a household name with millions of backlinks.

Most businesses reading this will live somewhere between 15 and 55. That’s completely normal and perfectly workable. I’ve seen sites with DA 25 outrank sites with DA 60 for specific keywords because they had better content and stronger page-level signals.

DA predicts rankings but doesn’t cause them

This is the single most important thing to understand about domain authority. It’s a prediction, not a mechanism. Moz’s model looks at what tends to correlate with ranking well - primarily backlinks - and produces a score. It’s like a credit score for your website’s link profile.

Google uses hundreds of ranking signals. Backlinks are one of them, which is why DA correlates with rankings. But Google also weighs content quality, user intent match, page experience, topical relevance, and dozens of other factors. DA captures none of those.

A site with DA 70 and thin, outdated content will lose to a site with DA 30 that has the best page on the internet for a given query. I’ve seen it happen repeatedly. DA tells you about link strength. It tells you nothing about content quality, technical SEO, or topical authority.

The practical takeaway: use DA as one input, not the input. When you’re evaluating competitors for a keyword, check their DA alongside their content quality, page-level backlinks, and topical depth. A high-DA competitor with a weak page is beatable. A low-DA competitor with the best content on the topic is dangerous.

Domain authority vs domain rating

Moz has DA. Ahrefs has Domain Rating - DR. They measure similar things but use different methodologies and different link indexes.

DR focuses almost entirely on the quantity and strength of a site’s backlink profile. It uses Ahrefs’ own crawl data, which is a different (and often larger) index than Moz’s. DR also uses a 0-100 logarithmic scale, but the scoring distributions differ. A site might be DA 35 and DR 45, or vice versa.

Neither is “better.” They’re different tools measuring slightly different things from different data sources. If you want a deeper comparison, I wrote a full breakdown of DR vs DA that covers the specific differences.

The important point is to pick one and be consistent when benchmarking. Comparing your DA to a competitor’s DR is meaningless because the scales aren’t equivalent.

What is domain authority useful for

DA works best as a relative comparison tool. Here are the scenarios where it actually helps.

Competitive analysis. Before targeting a keyword, check the DA of the sites currently ranking on page one. If every result is DA 70+ and you’re DA 25, that keyword is probably out of reach right now. If you see results from DA 20-40 sites, you have a realistic shot.

Link prospecting. When evaluating potential link partners or guest post targets, DA gives you a quick quality filter. A link from a DA 50 site is generally worth pursuing. A link from a DA 8 site that was registered three months ago probably isn’t.

Tracking progress over time. Your DA should trend upward as you build a legitimate link profile. If you’re doing real content marketing and earning natural links, you should see gradual DA increases over months and years. Stagnation might mean your link building strategy needs work. Our keyword research tool can help you find the right topics to target for content that naturally attracts links.

Benchmarking against competitors. Track your DA alongside two or three direct competitors quarterly. It gives you a rough sense of relative link authority in your niche.

What domain authority is not useful for

DA falls apart when people use it for things it was never designed to do.

Predicting rankings for specific pages. DA is a domain-level metric. Individual pages rank based on their own backlinks, content relevance, and page-level signals. A high-DA domain can have pages that rank for nothing because those specific pages have no links and weak content.

Comparing across different industries. A DA 30 in local plumbing services and a DA 30 in enterprise SaaS mean different things competitively. The link ecosystems are completely different.

Obsessing over small fluctuations. Your DA dropped two points? It doesn’t matter. Small movements are noise - recrawl timing, index updates, model recalibrations. Only sustained trends over several months mean anything.

How to improve your domain authority

DA improves when your link profile improves. There’s no shortcut. You need more high-quality backlinks from diverse, relevant domains.

The basic playbook: create content worth linking to, make it easy to find, and give people reasons to reference it. Original research, thorough guides, free tools, and data-driven content tend to attract links naturally. I covered the full strategy in how to increase domain authority if you want the detailed version.

What won’t work: buying links, participating in link schemes, or spamming directories. Moz’s spam detection catches these patterns, and even if it didn’t, Google’s does. Artificial links either get ignored or get you penalized.

The honest truth about DA is that it’s a lagging indicator. By the time your DA increases, the underlying improvements - better content, more natural backlinks, stronger brand presence - have already been working for months. Focus on those underlying improvements and let DA follow.

DA alongside other metrics

Smart SEO doesn’t rely on a single metric. Pair DA with Page Authority to get page-level link strength, check actual organic traffic estimates to see if authority translates to visibility, and look at topical relevance to understand whether a site’s authority extends to your specific niche.

Domain authority is a useful tool in the SEO toolkit. Just remember what it is - a third-party prediction based on link data - and what it isn’t - a Google ranking factor or a complete picture of your site’s search potential. Use it as one signal among many, and you’ll make better decisions than the people chasing DA points like they’re chasing a high score.