Domain Authority (DA) is a proprietary Moz score, 1 to 100, that predicts how likely a site is to rank in Google’s organic results. It blends more than 40 signals—dominated by the number and quality of referring domains—into a single logarithmic number. DA is not a Google ranking factor. It is a directional benchmark for link prospecting, competitive analysis, and progress tracking.
DA is the single most misused number in SEO. Used as a compass, it accelerates link prospecting and competitive analysis. Used as a KPI, it drives teams to chase vanity metrics that Google itself does not care about.
What is Domain Authority?
Domain Authority is a machine-learning score built by Moz that estimates a domain’s overall ranking potential. It sits on a 1-to-100 logarithmic scale, meaning moving from DA 20 to 30 is far easier than moving from DA 70 to 80. Moz recalculates DA on a periodic cadence as it recrawls the web.
Because the scale is logarithmic, small numeric gains at the top compound. A DA 80 site typically has orders of magnitude more link equity than a DA 40 site, not twice as much.
Google has publicly stated that DA is not a ranking factor. Its internal system, PageRank, is a related but separate concept. DA remains useful only as a proxy—the backlinks it measures are the actual signals Google acts on.
Why Domain Authority matters
- Link prospecting. Filter guest-post opportunities and outreach targets by DA to avoid wasting time on low-quality sites.
- Competitive benchmarking. Compare your DA to the top-ranking sites for your target keywords. If they are DA 70 and you are DA 15, target long-tail queries first.
- Client reporting. DA growth is easy to explain in a monthly report. It shows progress even when rankings are still catching up.
- Toxic-link detection. Sudden DA drops usually signal an influx of spam links that need to be disavowed.
How Domain Authority is calculated
Moz’s machine-learning model analyses 40+ inputs. The heaviest weights sit on the backlink graph:
- Total unique referring domains
- Quality (DA) of those referring domains
- Anchor-text diversity and relevance
- Spam signals across the link profile
- Historical trend of link acquisition
The output is normalized to a 1–100 logarithmic scale so that scores remain comparable as the web grows.
DA ranges by business type
| Site type | Typical DA | Signal | What to focus on |
|---|---|---|---|
| Brand-new site | 1–10 | Fresh domain | Foundational links, content velocity |
| Local business | 20–35 | Competitive locally | Local citations, community links |
| National SMB | 35–55 | Strong for most queries | Digital PR, resource pages |
| Enterprise / publisher | 60–80 | Category leader | Original research, syndicated links |
| Major brand | 80–100 | Household name | Reputation management |
Real Domain Authority examples
Three patterns from real client work show how DA moves in practice.
1. Local law firm: DA 1 to 18 in six months
Starting DA: 1 · Referring domains: 0
# Program: weekly blog + local citations + one news feature
Month 6 DA: 18 · Referring domains: 47
2. Guest-post evaluation
Site A: DA 54, clean referral base → accept
Site B: DA 12, spammy neighbourhood → skip
3. Agency reporting
Month 0 DA: 14→Month 8 DA: 29
Organic sessions: +312%
Domain Authority vs Domain Rating
Both DA and DR predict ranking strength from backlinks. The difference is what each metric weights and how it updates.
Use DA (Moz) when
- You already work in Moz Pro or Link Explorer
- You want a metric that includes spam-score signals
- You are evaluating overall domain quality, not raw link volume
- Your client reports historically show DA
- You are prospecting for guest posts with editorial vetting
Use DR (Ahrefs) when
- You work in Ahrefs as your primary SEO stack
- You care about raw referring-domain graph strength
- You need near-real-time updates as new links appear
- You are running large-scale link audits
- Your competitors are also benchmarked in Ahrefs
7 best practices for growing Domain Authority
- Prioritise diverse referring domains. 10 links from 10 different sites outperform 100 links from a single domain.
- Earn, don’t buy. Purchased links inflate DA short-term but trigger Moz spam flags and Google manual actions.
- Build gradually. Suspicious velocity spikes get penalised by both Moz’s spam score and Google’s link-graph filters.
- Create link-worthy assets. Original research, industry data, and definitive guides earn passive links for years.
- Audit toxic links quarterly. Disavow spammy referring domains before they drag DA down.
- Fix technical issues first. A crawlable, indexable site is a prerequisite—no link equity flows to broken pages.
- Benchmark competitors, not universal targets. DA 40 is elite in one niche and mediocre in another. Compare against SERP peers only.
Teams spend months lifting DA from 25 to 35 without moving a single keyword. DA is a proxy for authority, not a substitute for content relevance, technical health, or search intent match. Rankings—not DA—drive traffic and revenue.
Common Domain Authority mistakes to avoid
- Treating DA as a Google ranking factor. It is not. Google’s John Mueller has confirmed this multiple times.
- Prioritising DA over topical relevance. A DA 30 link from a niche-fit site beats a DA 70 link from an unrelated blog.
- Buying bulk links to inflate DA. Moz spam signals catch it fast; Google follows shortly after.
- Ignoring page-level authority. A high-DA site does not guarantee any specific page ranks—Page Authority is the page-level counterpart.
- Comparing DA across niches. DA 30 is competitive in local plumbing and irrelevant in SaaS.
Frequently asked questions
Context matters more than the raw number. Local businesses are competitive at DA 20–30. National brands typically hold DA 50+. Compare against your direct SERP competitors rather than chasing a universal target.
No. DA is a third-party Moz metric. Google has repeatedly confirmed it does not use DA as a ranking signal, though the backlinks DA measures are ranking signals in their own right.
Expect 3–6 months of consistent link building for meaningful movement. Growing from DA 1 to DA 20 is achievable in a year with steady effort; DA 40 to DA 50 can take 2+ years because the scale is logarithmic.
No. A high-DA site with irrelevant content will underperform a lower-DA site with strong on-page SEO and topical fit. DA should complement content strategy, not replace it.
DA is Moz’s metric and blends over 40 signals including link quality and diversity. DR is Ahrefs’ metric focused on the strength of the referring-domain graph. Both are 1–100 logarithmic scales; use whichever your team standardizes on.
Related glossary terms
Sources
