Domain authority is a visibility score, ranging from 1 to 100, that predicts how likely an entire website is to rank in search results based on its backlink profile strength. It is a third-party estimate produced by link-analysis software, so it carries no weight inside Google's own ranking systems and differs from page-level scores that grade a single URL.
You use domain authority to judge whether a site can compete for a keyword before you commit months of content and link-building budget to the attempt. Misread it as a Google ranking factor and you will chase a number that shifts with index refreshes while your real rankings stay flat.
Domain authority measures the overall ranking strength of a website by scoring its backlink profile against every other domain that Moz has indexed. Moz created the metric as the first score of its kind, and it remains a prediction of ranking potential. It does not report where you rank.
The score runs on a machine-learning model trained on real Google search results, fed by Moz's Link Explorer web index, a description Semrush corroborates. Its main inputs are the number of linking root domains, the quality of those links, and spam signals that flag manipulative link patterns. Because the model is calibrated across the whole index, your score can move when Moz refreshes that index, even in a week when you gained or lost no links.
Page authority applies the same modeling to a single URL, so a strong domain can still host weak pages. Ahrefs Domain Rating and Semrush Authority Score estimate similar ideas on their own indexes, and their numbers will not match Moz point for point. AirOps helps you build the authoritative content that earns the links and mentions these scores are trying to measure.
See which brand authority signals help you earn links and citations
A model calculates domain authority each time Moz refreshes its index, then scores your domain on a 1 to 100 scale relative to every site it tracks.
Crawl the web: Moz's crawler maps links across the internet and stores them in the Link Explorer index.
Score the links: The model weighs each linking root domain by quality and trust, so one link from a respected publisher outweighs dozens of low-value links.
Detect spam: Spam signals flag manipulative patterns like link farms and paid link networks, which discount or ignore those links.
Fit to Google results: The model compares link profiles against real Google results to predict ranking ability, then calibrates the score to correlate with what ranks.
Scale 1 to 100: Your prediction maps onto a logarithmic scale, which is why moving from 20 to 30 is far easier than 70 to 80.
A domain authority score tells you how your backlink profile compares to other sites in Moz's index. It does not tell you how you will rank for a keyword, because it ignores content relevance, search intent, and on-page factors.
Domain authority gives you a fast read on competitive difficulty before you spend a budget. When you evaluate a keyword, a target site for a guest post, or an acquisition, the score tells you how much link equity you are up against and whether the effort is worth it.
Prioritize where you compete: Comparing your score to the sites already ranking shows which keywords are realistic now and which need years of link-building first, so you spend effort where it can pay off.
Vet links and partners: Checking a prospect's score before a guest post, sponsorship, or backlink exchange helps you avoid low-authority or spammy sites that pass little value and can drag your own profile down.
Catch a failure mode early: Treating domain authority as a Google ranking factor sends teams chasing score increases that never move traffic, burning quarters on link volume while relevance and content gaps go unfixed.
SEO managers use domain authority to benchmark their own site against direct competitors before committing to a keyword roadmap.
Content strategists use domain authority to decide which topics and keywords they can realistically rank for over the next two quarters.
Growth marketers use domain authority to vet guest-post targets and partnership sites before spending budget on outreach and link-building campaigns.
The count of unique websites that link to you matters more than raw link volume, because a hundred links from one site move your score far less than links from a hundred different sites, which is why building diverse referring domains is the surest way to raise the score.
Because the scale compresses at the top, each additional point is harder to gain than the last, so a jump from 30 to 40 reflects far less link growth than a jump from 60 to 70, so early gains come quickly and later gains demand serious link-building.
Your score is graded against the rest of Moz's index, so it can rise or fall when Moz recalibrates or when competitors gain links, even if your own backlinks never change, which makes month-to-month swings normal and absolute numbers less useful than the gap to competitors.
Gauge competitive difficulty for a keyword before you invest content or links.
Prioritize link-building targets by comparing referring-domain strength across candidate sites.
Track your authority trend inside Moz's Link Explorer as your backlink profile grows.
Cross-check a single number against Ahrefs Domain Rating or Semrush Authority Score for a fuller picture.
Screen guest-post and partnership prospects to avoid low-value or spammy sites.
Compare scores within the same tool, because a Moz number and an Ahrefs number are built on different indexes and will not match.
Track your score as a trend over months, since a single reading tells you little without direction.
Benchmark against the sites ranking for your target keywords, so the number reflects real competition.
Earn links from diverse, relevant, high-trust domains, because referring-domain variety moves the score more than raw link count.
Audit your backlink profile for spammy or toxic links, which can suppress your score and your rankings together.
Pair the score with content and intent analysis, since authority alone does not win a specific query.
Avoid treating domain authority as a target you optimize directly. It is an estimate of your link profile's strength, so the durable move is to earn better links and stronger content and let the score follow. Chasing the number itself pushes teams toward link volume and manipulative tactics that Moz's spam signals are built to catch.
AirOps: Build authoritative, citation-ready content that earns the links and mentions driving domain authority across search and AI answers.
Moz Link Explorer: Check your domain authority score directly, along with linking root domains and spam score, from the tool that produces the metric.
Semrush or Ahrefs: Cross-check authority with a second index using Authority Score or Domain Rating, and audit backlinks for toxic links.
Check your baseline: Install the free MozBar browser extension or open Moz's Link Explorer and record your current domain authority score today. This costs nothing and gives you a starting number to track.
Map your competitors: Pull the scores of the sites ranking for your top target keywords, so you know the real bar you have to clear. Semrush and Ahrefs report their own versions if you already use one.
Audit your backlinks: Review your referring domains for spammy or low-value links, and note the high-trust sites already linking to you. Disavow only clearly toxic links, since aggressive disavows can do more harm than good.
Build a link plan: Prioritize outreach to relevant, credible sites and content worth citing, since diverse referring domains move the score most. One respected publisher outweighs dozens of thin directories.
Track the trend: Recheck your score every month and watch its direction against competitors instead of fixating on a single reading.
Domain authority is Moz's 1 to 100 prediction of how well a whole website can rank, based on its backlink profile.
A machine-learning model trained on Google results scores it from linking root domains, link quality, and spam signals.
The scale is logarithmic and relative, so scores shift with index refreshes and get harder to raise near the top.
Google does not use domain authority, so treating it as a ranking factor wastes effort on a number that may never move traffic.
Earning diverse links from trusted, relevant sites is the durable way to raise it and the rankings it estimates.
Domain authority and Ahrefs Domain Rating measure similar things with different data, so their numbers rarely match. Domain authority is Moz's score, built from Moz's Link Explorer index and a model calibrated against Google search results, and it weighs link quality, linking root domains, and spam signals. Domain Rating is Ahrefs' score, built from the Ahrefs backlink index, and it focuses heavily on the strength and quantity of referring domains. Because each tool crawls a different slice of the web and weights signals its own way, a site can land in the 50s on one and the 60s on the other. Neither is more correct in an absolute sense. Pick one tool as your reference and stay consistent, so your trend lines and competitor comparisons use the same yardstick. Switching between tools mid-project makes your data look like it moved when only the measurement changed.
Domain authority updates whenever Moz refreshes its web index, which happens roughly monthly, and single updates can move your score by several points in either direction. Some of that movement reflects links you gained or lost. Much of it reflects changes elsewhere: Moz recalibrating the model, competitors gaining links, or the index expanding to cover more of the web. This is why a one-point drop is rarely worth investigating. Look at the direction over three to six refreshes instead of reacting to any single update. A score that falls sharply and stays down across several refreshes signals a real problem worth auditing, such as lost high-value links or a spam penalty on referring domains. Small monthly wobbles are normal and expected. Track the trend line and your gap to competitors, because those tell you far more than the exact number on any given day.
Domain authority can drop even when your own links are intact because the score is relative and recalculated against Moz's entire index. When Moz refreshes or expands that index, it re-measures every domain at once, so your position can slip if competitors earned links or if the overall link graph grew. Moz also periodically retrains the model behind the score, and a recalibration can nudge many domains up or down on the same day. These swings come from the measurement changing around you while your site stays the same. The practical response is to compare your score against direct competitors after each refresh, since a shared drop points to a model change while an isolated drop points to something specific on your site. Focus your energy on earning new links from trusted, relevant domains, because a growing, diverse backlink profile is the one input you control and the one that lifts the score over time.
You cannot edit domain authority directly, but you can influence the inputs the model reads, which is the honest version of control. The score is Moz's calculation, so there is no setting to change and no way to submit a higher number. What you can do is improve your backlink profile, which is what the model actually measures. Earn links from credible, relevant sites through content worth citing, outreach, and genuine partnerships, and clean up spammy or toxic links that drag the profile down. These changes show up in your score after Moz recrawls and refreshes its index, so expect a lag of weeks before changes appear. You also cannot control what competitors do or how Moz recalibrates the model, which is why the number wobbles. Put your effort into the backlink quality and diversity you can affect, and treat the score as a lagging read on the work you put in.
A good domain authority score is defined by your competition, so there is no universal number that counts as good. On the 1 to 100 scale, most established sites sit somewhere in the middle, large publishers and household brands reach the 80s and 90s, and a new site starts in the single digits or low teens. Those bands are context for comparison. What matters is how you compare to the specific sites ranking for the keywords you want. When the top results for your terms sit in the 40s, a score in that range makes you competitive, and pushing far beyond it wastes effort. Because the scale is logarithmic, early gains from 10 to 30 come relatively fast, while gains above 60 demand sustained, high-quality link-building. Set your benchmark against your ranking rivals, aim to close the gap, and measure progress in relative terms so a moving index never distorts what good looks like for you.