86.2
/100
5
/5
13.8
/100
20
46
/100
72.7
/100
86.2
/100
5
/5
13.8
/100
20
46
/100
72.7
/100
The Domain Authority Estimator provides an approximate DA score based on the key signals that domain authority metrics consider: backlink quantity, referring domain diversity, domain age, organic traffic volume, and content breadth. While the actual Moz DA algorithm uses a machine learning model trained on Google's search results, the signals it evaluates are well-understood and can be used to estimate where your domain falls on the 0-100 scale.
Domain Authority was developed by Moz as a search engine ranking prediction score. It uses a logarithmic 0-100 scale, meaning it becomes progressively harder to improve as your score increases. Moving from DA 20 to 30 is achievable with moderate effort, while moving from 70 to 80 requires exponentially more high-quality backlinks and brand authority. DA is a comparative metric — it is most useful for gauging your competitive position relative to other sites in your niche.
The core driver of domain authority is your referring domain profile. Sites with many links from diverse, authoritative referring domains score higher than those with links concentrated from a few sources. Ahrefs' Domain Rating, Majestic's Trust Flow, and SEMrush's Authority Score are similar third-party metrics that evaluate link authority, each with slightly different methodologies but strongly correlated results. Our estimator synthesizes the common factors across these metrics.
Beyond backlinks, domain age and organic traffic serve as trust and authority signals. Older domains with consistent traffic history demonstrate stability and sustained relevance. Content volume (indexed pages) contributes because sites with more high-quality content naturally attract more backlinks and rank for more keywords, creating a positive feedback loop that builds authority over time.
The estimator uses a weighted logarithmic model with five components:
$$\text{Estimated DA} = \text{RD Score} + \text{BL Score} + \text{Age Score} + \text{Traffic Score} + \text{Content Score}$$
Referring Domains Score (max 35 points) — the strongest signal:
$$\text{RD Score} = \min(35, \log_{10}(\text{Referring Domains}) \times 12)$$
Backlink Score (max 20 points):
$$\text{BL Score} = \min(20, \log_{10}(\text{Total Backlinks}) \times 5)$$
Age Score (max 15 points): 3 points per year, capped at 15.
Traffic Score (max 15 points) uses logarithmic scaling on monthly organic traffic. Content Score (max 15 points) uses logarithmic scaling on indexed page count. Logarithmic scaling reflects the diminishing marginal impact of each additional backlink, visitor, or page.
An estimated DA of 70+ (Tier 5) represents exceptional authority — typically major brands, news sites, and established platforms. 50-69 (Tier 4) is strong authority achieved by successful businesses and popular niche sites. 30-49 (Tier 3) is average and typical for established small businesses and growing content sites. 15-29 (Tier 2) represents developing sites with growth potential. Below 15 (Tier 1) indicates a new or under-developed domain. The growth potential score indicates how much room you have to improve — focus on acquiring quality referring domains as the highest-impact strategy.
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Results
With 250 referring domains, 3 years of age, and 10K monthly traffic, this site estimates at DA 53 — a solid mid-range authority with good growth potential.
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Results
A 6-month-old blog with 30 referring domains estimates at DA 28. Focus on content creation and outreach to diverse referring domains for the fastest DA growth.
Domain Authority (DA) is a search engine ranking score developed by Moz that predicts how likely a website is to rank in search results. It uses a 0-100 logarithmic scale. DA is calculated using a machine learning model that correlates link data with actual Google rankings. It is not a Google metric — it is a third-party prediction tool. Other companies have similar metrics: Ahrefs has Domain Rating (DR), SEMrush has Authority Score, and Majestic has Trust Flow.
DA improvement is a slow, long-term process. With consistent effort, expect: DA 0-20: achievable in 3-6 months with quality content and basic link building. DA 20-40: typically takes 1-2 years with regular content publishing and active outreach. DA 40-60: requires 2-5 years of sustained effort. DA 60+: usually takes 5+ years and significant brand authority. DA can also drop if competitors gain links faster or if you lose high-quality backlinks.
DA drops can occur from: Moz index updates (Moz regularly recrawls and recalculates, which can cause fluctuations), lost backlinks from referring domains removing or changing links, competitor growth (DA is relative, so others gaining links can lower your score), algorithm changes to the DA calculation model, or spammy link cleanup where Moz devalues low-quality links in your profile. A 3-5 point fluctuation during index updates is normal.
No. Google has explicitly stated it does not use Moz's Domain Authority or any third-party authority score in its ranking algorithm. However, the signals that DA measures (backlink quality, referring domain diversity) strongly correlate with Google's actual ranking factors. Think of DA as a proxy metric — it predicts ranking potential based on factors Google cares about, but Google uses its own proprietary link analysis (originally based on PageRank) rather than DA.
Referring domains are significantly more important than total backlink count. One link each from 100 different websites is far more valuable than 100 links from a single website. This is because each referring domain represents a unique vote of confidence. After the first link from a domain, additional links from the same domain have rapidly diminishing returns. Our estimator weights referring domains at 35% versus backlinks at 20% to reflect this reality.
Buying links to inflate DA violates Google's link spam policies and risks severe penalties including ranking demotion or deindexing. Purchased links from PBNs and link farms are increasingly detected by Google's SpamBrain algorithm. Instead, invest in creating link-worthy content (research, tools, infographics), digital PR, guest posting on legitimate publications, and building genuine industry relationships. Earned links build sustainable authority that purchased links cannot replicate.
Older domains tend to have higher authority because they have had more time to accumulate backlinks, build content libraries, and establish brand recognition. However, age alone does not build authority — an old domain with no content or links will have low DA. Google's John Mueller confirmed that domain age is not a ranking factor, but the activities that occur over time (link acquisition, content creation) are. Our estimator caps age contribution at 5 years to reflect the diminishing impact beyond that point.
More indexed content pages create more opportunities for attracting backlinks (each page is a potential link target), ranking for long-tail keywords (driving traffic that contributes to authority signals), and internal linking (distributing link equity throughout your site). However, quality matters more than quantity — 100 comprehensive, well-optimized pages will build more authority than 1,000 thin, duplicate, or low-value pages. Our model uses logarithmic scaling to reflect this diminishing return.
Use tools like Moz Link Explorer, Ahrefs, or SEMrush to check competitor DA scores. Focus on competitors ranking for your target keywords rather than unrelated high-DA sites. Calculate the DA gap between your site and top-ranking competitors to set realistic improvement targets. If competitors average DA 50 and you are at DA 30, you likely need 12-24 months of dedicated link building to close the gap. Analyze which links competitors have that you do not for targeted outreach.
Domain Authority (Moz) uses a machine learning model on Moz's link index, scoring 0-100. Domain Rating (Ahrefs) focuses purely on the backlink profile strength using Ahrefs' crawler data, also 0-100. Authority Score (SEMrush) combines backlinks, organic traffic, and spam factors on a 0-100 scale. While all three are correlated, scores for the same domain often differ by 10-20 points across tools due to different crawl data, algorithms, and update frequencies. Choose one as your primary tracking metric for consistency.
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