What Is Domain Authority? Definition & Guide

Domain authority (DA) is a score -- originally developed by Moz -- that predicts how likely a website is to rank in search engine results pages. Scored on a scale from 1 to 100, it is calculated based primarily on the quantity and quality of inbound backlinks pointing to the domain. Higher scores indicate stronger authority and generally correlate with better rankings. Similar metrics exist across other SEO tools, including Ahrefs' Domain Rating (DR) and Semrush's Authority Score.

Why Domain Authority Matters

Domain authority is a proxy metric for site credibility in the eyes of search engines. While Google does not use DA as a direct ranking factor -- it is a third-party metric, not an official signal -- it is a useful indicator of how competitive a site is and how likely its pages are to rank for contested keywords.

For competitive analysis, DA is indispensable. Before targeting a keyword, checking the DA of the sites currently ranking tells you how much authority you need to break into the results. A site with a DA of 25 trying to rank against sites with DA 75+ will struggle, no matter how good the content is. Knowing this helps you prioritize realistic opportunities.

Link building strategies also rely on DA as a quality filter. Earning backlinks from high-DA sites passes more authority than links from low-DA sites. When evaluating link-building targets, DA (or DR) is one of the first filters to apply.

How It Works

Domain authority is calculated primarily from the link graph -- the network of sites linking to your domain and the sites linking to those linking sites. A domain with many backlinks from high-authority, relevant sites will have a higher DA than a domain with few or low-quality links. New domains typically start at a DA of 1 and build over time as they earn links.

DA is a relative metric, so a "good" score depends on your competitive landscape. For niche topics with low-DA competition, a score of 30 might be plenty. For competitive industries like finance or health, even a DA of 50 might not be enough to rank on page one.

Improving DA is essentially synonymous with effective link building. Creating high-value content that earns citations, running digital PR campaigns, and pursuing strategic outreach all contribute to building the backlink profile that raises DA over time. Averi helps content teams create the types of authoritative, linkable content that naturally attracts links from reputable sources.

Domain Authority Best Practices

• Use DA to quickly assess keyword competitiveness before investing in new content
• Set realistic DA benchmarks for link-building targets -- prioritize sites with DA higher than yours
• Do not chase DA for its own sake -- focus on earning links from topically relevant, high-quality sites
• Avoid tactics that inflate DA artificially, like purchased links or link farms
• Track your domain's DA trend over time as a measure of link-building progress
• Compare your DA to direct competitors -- relative authority matters more than absolute score

Related Resources

• Link Building Guide
• Keyword Research Guide
• SEO Content Guide

Frequently Asked Questions

Who created domain authority and how is it calculated? Moz created Domain Authority (DA) as a proprietary metric. It is calculated on a 1–100 logarithmic scale based on the quantity and quality of links pointing to a domain, root domains linking to the site, and other link-based signals. The exact formula is proprietary and changes periodically. Ahrefs has a similar metric called Domain Rating (DR); Semrush uses Authority Score. None of these are Google metrics.

Does domain authority directly impact Google rankings? Not directly — Google does not use Moz's DA or any equivalent third-party metric as a ranking factor. However, high DA tends to correlate with higher rankings because the underlying signals (strong backlink profile, trusted content, long history) are signals that Google does value. Think of DA as a proxy for SEO strength, not a direct ranking input.

How long does it take to increase domain authority? Months to years. Moving from DA 20 to DA 40 is much faster than moving from DA 50 to DA 70 because the scale is logarithmic — higher scores require exponentially more and better-quality links. Building backlinks through content marketing (earning links by publishing genuinely useful content), digital PR, and partnership placements are the most sustainable approaches.

Is a lower-DA site able to rank above a higher-DA site? Yes, regularly. Domain authority is a domain-level metric; individual page quality, topical relevance, search intent match, and page-level authority all influence where a specific page ranks. A DA 40 site with deeply comprehensive content on a topic can outrank a DA 70 site with thin or tangentially relevant coverage. Target keywords where content quality can overcome an authority gap.

Should startups focus on building domain authority early? Yes, but through the right actions. Acquire backlinks by publishing genuinely useful content that others want to link to, getting covered in press, and building partnerships with complementary sites. Avoid black-hat tactics (link buying, link farms) — they can boost DA temporarily but carry Google penalty risk. Foundational DA-building work done early compounds over years.