What Is Domain Authority?
Domain Authority (DA) is a score developed by Moz that predicts how likely a website is to rank in search engine results pages (SERPs). It runs on a scale from 1 to 100 — the higher the score, the greater the predicted ranking strength.
It's important to understand that Domain Authority is not a Google metric. Google does not use DA in its algorithm. However, DA (and similar metrics like Ahrefs' Domain Rating) are useful proxies for estimating a site's overall link authority and competitive standing.
How Is Domain Authority Calculated?
Moz calculates DA using a machine learning model that factors in:
- Linking root domains: The number of unique websites linking to yours. More unique domains = stronger signal.
- Total backlinks: The overall volume of inbound links, though this matters less than unique domains.
- MozRank and MozTrust: Internal Moz metrics that assess link quality and trustworthiness.
- Link quality: Links from authoritative sites pass more value than links from weak domains.
The score is relative — it's benchmarked against all other sites in Moz's index. This means your DA can drop even if you gain links, simply because other sites gained more.
DA vs. DR: What's the Difference?
| Metric | Provider | Scale | Primary Factor |
|---|---|---|---|
| Domain Authority (DA) | Moz | 1–100 | Link profile quality & quantity |
| Domain Rating (DR) | Ahrefs | 0–100 | Backlink quantity & linking domain DR |
| Authority Score | Semrush | 0–100 | Backlinks + organic traffic + spam signals |
Each tool uses its own crawler and methodology, so scores vary across platforms. It's useful to check multiple tools for a fuller picture.
How to Improve Your Domain Authority
1. Build More High-Quality Backlinks
The single biggest lever for DA growth is earning backlinks from authoritative, relevant websites. Focus on:
- Guest posting on established publications in your niche.
- Creating linkable assets (data studies, tools, comprehensive guides).
- Digital PR and press coverage.
- Broken link building and resource page outreach.
2. Diversify Your Link Profile
A healthy backlink profile includes links from many different root domains across a variety of content types — blog posts, news articles, directories, forums, and more. Over-reliance on one link type looks unnatural.
3. Audit and Remove Toxic Links
Low-quality or spammy links can drag down your DA. Use Moz's Link Explorer or Google Search Console to identify potentially harmful links and disavow them if necessary.
4. Improve Your Internal Linking
Strong internal link structure helps distribute link equity throughout your site, lifting the authority of individual pages and improving overall crawlability.
5. Publish Consistently Strong Content
High-quality content attracts organic backlinks over time. Every authoritative piece you publish is a potential link magnet. Focus on depth, original research, and genuine usefulness.
Realistic Expectations
DA growth takes time. A new site will typically start in the 1–20 range and grow incrementally as it earns more links. Jumping from DA 30 to DA 50 can take many months of consistent effort. Be wary of services promising rapid DA increases — sustainable gains come from genuine link acquisition.
Key Takeaway
Domain Authority is a useful compass for benchmarking your SEO strength and evaluating link prospects, but it's a means to an end — not the end itself. Focus on earning real links from real sites, and your DA will follow.