# Domain Authority (DA): What It Is & How to Use It Understand Domain Authority—what the Moz metric measures, its limitations, and how to use DA effectively in your link building strategy. Canonical: https://backlinkgrid.com/glossary/domain-authority **Domain Authority (DA)** is a search engine ranking score developed by Moz that predicts how likely a website is to rank in search engine results. Scored on a scale of 0-100, higher scores indicate greater ranking potential. ## Key Facts - **Creator**: Moz - **Scale**: 0-100 - **Not a Google metric**: DA is third-party, not used by search engines - **Comparative tool**: Best used for comparing sites, not as absolute measure --- ## How Domain Authority Works ### Calculation Factors DA is calculated using multiple factors: **Linking root domains**: Number of unique domains linking to the site **Total number of links**: Overall backlink count **MozRank and MozTrust**: Moz's own authority and trust metrics **Machine learning model**: Algorithm trained on actual search results ### The Algorithm Moz uses machine learning to correlate link data with search rankings. The model is periodically updated, which can cause score fluctuations even when your link profile hasn't changed. --- ## Understanding DA Scores ### Score Ranges | Range | Typical Sites | |-------|---------------| | 0-20 | New sites, small blogs | | 20-40 | Established small sites, niche blogs | | 40-60 | Popular sites, established businesses | | 60-80 | Major brands, authoritative publications | | 80-100 | Top news sites, major platforms (Wikipedia, Google) | ### Important Context **Logarithmic scale**: Going from 20 to 30 is much easier than 70 to 80. Higher scores require exponentially more effort. **Industry variation**: A DA 50 site may dominate in a small niche but struggle in competitive verticals. **New vs old sites**: New sites start at very low DA regardless of content quality. --- ## How to Use DA Effectively ### Good Uses **Prospecting**: Filter link opportunities by minimum DA **Competitive analysis**: Compare your DA to competitors **Progress tracking**: Monitor long-term growth trends **Quick qualification**: Initial filtering of potential link sources ### Poor Uses **Absolute measure**: DA 50 doesn't mean you'll rank **Site quality proxy**: High DA sites can still be low quality **Direct ranking predictor**: Google doesn't use DA **Short-term tracking**: Score fluctuates with algorithm updates --- ## DA vs Other Metrics ### Domain Authority vs Page Authority | Domain Authority | Page Authority | |------------------|----------------| | Measures entire domain | Measures specific URL | | Site-wide ranking potential | Page-specific potential | | Use for domain assessment | Use for specific page targeting | ### Domain Authority vs Domain Rating (Ahrefs) | Moz DA | Ahrefs DR | |--------|-----------| | 0-100 scale | 0-100 scale | | Multiple factors | Primarily backlink-based | | Includes MozTrust | Pure link quantity/quality | | Often different scores | Often different scores | Both are useful; neither is "correct." Use whichever tool you prefer or check both. ### Domain Authority vs Trust Flow | Moz DA | Majestic TF | |--------|-------------| | Ranking prediction | Trust measurement | | Broad factors | Link quality focus | | Single score | Works with Citation Flow | --- ## Improving Domain Authority ### What Actually Helps **Earn quality backlinks**: Links from high-DA sites **Build referring domain count**: More unique linking domains **Remove toxic links**: Disavow spam if necessary **Improve site quality**: Better overall link attractiveness ### What Doesn't Help Directly - On-page SEO changes - Content updates (unless they earn links) - Technical improvements - Social signals DA reflects your link profile. Improving DA means improving your backlinks. ### Realistic Timelines - New site to DA 20: 6-12 months - DA 20 to DA 40: 1-2 years - DA 40 to DA 60: 2-4 years - DA 60+: Years of consistent effort --- ## Common Misconceptions ### "Higher DA = Higher Rankings" **Reality**: DA correlates with rankings but doesn't cause them. Google uses its own signals. A lower-DA page with better content and relevance can outrank higher-DA pages. ### "I Need DA 50+ to Rank" **Reality**: Lower-DA sites rank all the time, especially for less competitive keywords or local searches. Focus on your specific competitive landscape. ### "DA Dropped—I've Been Penalised" **Reality**: DA fluctuates with Moz's algorithm updates. Score changes don't indicate Google penalties. Check Google Search Console for actual issues. ### "All High-DA Sites Are Good Link Sources" **Reality**: Some high-DA sites are spammy or irrelevant to your niche. DA is one factor—also assess relevance, traffic, and content quality. --- ## Checking Domain Authority ### Free Tools - Moz Link Explorer (limited free queries) - MozBar browser extension - Various SEO toolbars For a broader roundup, [compare the top free backlink checkers](/blog/best-free-backlink-checkers) that display DA alongside other key metrics. ### Paid Tools - Moz Pro (full access) - Tools that integrate Moz API - SEO suites with DA included ### Bulk Checking For prospecting at scale, use: - Moz's bulk DA checker - Spreadsheet add-ons - API integrations --- ## DA in Link Building ### Setting DA Thresholds Common prospecting minimums: - **DA 20+**: Basic quality filter - **DA 30+**: Moderate quality - **DA 40+**: Strong prospects - **DA 50+**: High-quality targets Adjust based on your own site's DA and industry. ### Beyond the Number Always consider: - **Relevance**: Is the site topically related? - **Traffic**: Does it have real visitors? - **Content quality**: Is the site legitimate? - **Link placement**: Where would your link appear? A DA 30 site perfectly relevant to your niche often beats a DA 60 site with no topical connection. --- ## Summary Domain Authority is a Moz metric predicting ranking likelihood on a 0-100 scale: **What it is**: - Third-party metric from Moz - Based on link data and machine learning - Useful comparative tool **What it isn't**: - A Google ranking factor - An absolute quality measure - A direct ranking predictor **Best used for**: - Comparing sites to competitors - Filtering link prospects - Tracking long-term progress Focus on building quality backlinks; DA will follow. --- ## Check Domain Authority Use our [free backlink checker](/tools/free-backlink-checker) to instantly check Domain Authority and other metrics for any website using Moz, Ahrefs, and other tools. ## Related Terms - [Page Authority](/glossary/page-authority) - [Authority Metrics](/backlink-quality/authority-metrics) - [Trust Flow](/glossary/trust-flow) - [Evaluating Link Opportunities](/backlink-quality/evaluating-link-opportunities)