Domain Authority is a proprietary metric developed by Moz that scores websites on a 1-100 scale based on their perceived ranking strength. Higher scores indicate greater predicted ranking ability, with anything above 50 considered strong and above 70 exceptional. The score comes from analyzing link profile signals including the number of linking root domains, total inbound links, quality of those links, and internal metrics like MozRank and MozTrust. The important reality: Google doesn't use DA in its algorithm. It's a third-party estimation tool, not an official ranking factor. Ahrefs has Domain Rating (DR), Semrush has Authority Score, and Majestic has Trust Flow. These are all different scoring systems trying to model Google's actual assessment of domain strength. They correlate with rankings but don't cause them. DA changes monthly as Moz recrawls the web and updates its link index. A drop in your DA doesn't mean Google penalized you. It often means Moz's index changed, competitors built more links, or the scoring algorithm was adjusted. Similarly, buying links just to boost DA is missing the point entirely because you're optimizing for someone else's approximation rather than actual search performance. At Ottawa SEO, we track DA across our 500+ domain portfolio as one signal among many, but we prioritize actual organic traffic and rankings. A site with DA 25 that ranks for valuable commercial keywords is infinitely more useful than a DA 60 site with no traffic. When building links for clients, we evaluate target domains by relevance, traffic potential, and editorial quality first. If those boxes are checked and the domain happens to have strong DA, that's a bonus confirmation. Use DA as a quick comparative benchmark when evaluating potential link sources or monitoring your site's progress relative to competitors. Just don't worship the number or assume it directly translates to Google's view of your domain. Focus on earning quality links from relevant sources, and authority metrics typically follow as a byproduct. What Does Domain Authority Score Mean for Different Website Types Domain authority score meaning shifts depending on your site category. A local plumber with DA 18 competing against other local businesses in the same range is perfectly positioned to rank for geo-specific terms. That same DA 18 means nothing if you're trying to rank nationally against major publications. New websites typically start around DA 10-15 and take 12-18 months of consistent link acquisition to reach the 25-35 range. Government sites (.gov) and established news outlets often sit in the 80-90 range simply because they accumulate massive link profiles over decades. When evaluating what your DA score means, always compare within your competitive set rather than against unrelated industries. Understanding the Domain Authority Score Scale The domain authority score scale runs 1-100 but isn't linear. Moving from DA 10 to 20 is far easier than moving from 60 to 70 because the scale is logarithmic. Each point becomes progressively harder to earn as you climb. Most small business websites fall in the 15-35 range, mid-sized companies with active content programs typically land between 35-55, and enterprise brands or major publications occupy the 55-85 territory. Scores above 85 are almost exclusively held by massive platforms like Wikipedia, government domains, and global news organizations. When assessing competitors, a 5-point gap at the lower end matters less than a 5-point gap in the 50+ range. How to Interpret DA Score Changes Over Time Knowing how to interpret DA score fluctuations prevents unnecessary panic. Monthly recalculations mean your score can shift 3-5 points without any change to your actual site. Moz periodically updates their algorithm, which can cause industry-wide resets. We've seen entire client portfolios drop 8-10 points overnight during major index updates, only to stabilize weeks later. Track your DA alongside competitor DAs to spot relative changes versus universal index shifts. If you dropped but competitors dropped equally, that's an algorithm update. If only your site dropped while competitors held steady, investigate recent link losses through Moz's Link Explorer or check if linking domains went offline. Domain Authority Score Explained Alongside Other Metrics Domain authority score explained in isolation misses the bigger picture. Pair it with Page Authority for specific URL strength, spam score to flag toxic link profiles, and linking root domains for raw acquisition volume. A site might have DA 45 but with 60% of links from spammy directories, which spam score would reveal. Conversely, a DA 30 site with links from 200 unique relevant domains often outperforms a DA 50 site with links concentrated from just 15 sources. When we evaluate link building targets, we weight relevance and traffic potential heavily, then use DA as secondary confirmation. The score alone never tells you whether a link opportunity is worth pursuing. Frequently Asked Questions What does domain authority score mean? Domain authority score indicates a third-party prediction of your site's ranking potential based on link profile strength. It's a comparative benchmark showing where you stand relative to competitors, not an actual Google metric. Higher scores suggest stronger link profiles but don't guarantee rankings. What is the domain authority score scale? The scale runs 1-100 logarithmically, meaning each point becomes harder to earn as you climb. Scores 1-20 are typical for new sites, 20-40 for established small businesses, 40-60 for mid-sized companies with active SEO, and 60-100 for major brands and publications. How do you interpret DA score? Compare your DA against direct competitors rather than unrelated industries. Track changes monthly alongside competitor scores to distinguish algorithm updates from actual link profile shifts. Pair with spam score, linking root domains, and actual traffic data for complete context. How is domain authority score explained simply? It's Moz's estimate of how authoritative search engines might view your domain based on your backlink profile. Think of it as a credit score for SEO. Higher numbers suggest stronger perceived authority, but like credit scores, different agencies calculate differently and the number itself doesn't determine outcomes.