Ahrefs DR vs Moz DA — What's the Difference?

If you've ever pulled up the same website in Ahrefs and Moz and gotten two different authority scores, you're not imagining a bug — you're seeing two independent measurement systems disagree, which is exactly what should happen when two different companies build their own web crawlers, their own link indexes, and their own formulas. Domain Rating (DR) and Domain Authority (DA) both try to answer "how strong is this domain's backlink profile," but neither is calculated the same way, and neither is meant to match the other.

This guide breaks down exactly how each is calculated, why they diverge, which one (if either) you should actually track, and what neither one tells you about your real ranking potential.

What Domain Rating (Ahrefs) Actually Measures

Domain Rating is Ahrefs' proprietary 0-100 score representing the overall strength of a website's backlink profile, based on the quantity and quality of unique referring domains. It runs on a logarithmic scale — moving from DR 20 to DR 30 represents a much larger real increase in link equity than moving from DR 70 to DR 80, because gains get progressively harder to achieve as a domain's authority increases.

The calculation weighs each referring domain by its own DR (a link from a DR 80 site counts for more than a link from a DR 15 site) and factors in how many outbound links that referring domain spreads its authority across (a link from a page linking out to 5 other sites passes more equity than a link from a page linking out to 500). Ahrefs recalculates DR continuously as its crawler revisits and reindexes the web, so scores update close to real-time relative to new link data Ahrefs discovers.

Ahrefs is explicit that DR is not a Google ranking factor. It's a relative benchmark — useful for comparing two domains against each other within Ahrefs' own index, not an absolute measure of authority recognized by search engines.

What Domain Authority (Moz) Actually Measures

Domain Authority is Moz's 0-100 score, also logarithmic, built differently under the hood: rather than a hand-tuned weighting formula, Moz trains a machine-learning model to predict how well a domain is likely to rank in search results, using historical correlations between link-profile characteristics and actual Google ranking positions across a large training set of real search results.

This is a meaningfully different approach from DR's more direct link-equity calculation. DA is trying to approximate ranking potential by pattern-matching against what's historically correlated with strong rankings; DR is trying to directly quantify link-profile strength based on a defined formula. Both are estimates, but they're estimates built from different philosophies, which is part of why they diverge even when looking at the same underlying links.

Moz's own crawler, Link Explorer, powers the link index behind DA, and like Ahrefs, Moz updates its index periodically as it recrawls the web — though generally understood to be at a somewhat less frequent cadence than Ahrefs' near-continuous updates.

Why the Numbers Almost Never Match

Three separate factors compound to make DR and DA diverge for the same site:

Different crawl coverage. Ahrefs and Moz each run independent web crawlers that discover and index links on their own schedule. Neither has crawled the entire web, and their indexes overlap only partially — a link that exists on a smaller or newer site might be well-represented in one index and missed entirely by the other, simply due to differences in crawl prioritization and budget.

Different calculation methods. As covered above, DR is a more direct link-equity formula; DA is a machine-learning model trained on ranking correlations. Even fed identical input data, these two approaches would produce different outputs, because they're solving for different things.

Different update frequency. Ahrefs' near-real-time recrawling means DR can shift faster in response to new links than DA, which updates on a periodic index refresh cycle. A domain that just earned a batch of new high-quality links might show that change in DR before it shows up in DA.

None of this means either tool is "wrong." They're both legitimate, widely-used proprietary metrics — they're just not measuring the same thing with the same method from the same data.

Free Access to Each

Both companies offer limited free access as a lead-generation tool. Ahrefs' free DR checker (no login required) returns a domain's current DR plus a capped sample of its top backlinks. Moz's free tier of Link Explorer (MozBar, or a limited number of free Link Explorer searches) returns DA plus a capped list of linking root domains. Neither free tier is comprehensive — they're useful for a quick gut-check, not a full audit — but stacking both (and adding a third checker like Ubersuggest) gets you closer to a complete picture without paying for either subscription. Our own comparison of free backlink checkers walks through exactly how to combine them.

Which Metric Should You Actually Track?

The practical answer: pick one, track it consistently over time, and stop trying to reconcile it against the other. Because DR and DA are built from different indexes and different formulas, converting one into the other or expecting them to trend identically is a losing exercise — you'll just end up confused by normal divergence that doesn't mean anything is wrong.

What actually matters is the trend line, not the absolute number. If your DR moves from 15 to 25 over six months as you build real, relevant backlinks, that's a meaningful signal regardless of what your DA happens to show over the same period. Chasing both numbers simultaneously, or worse, trying to hit a specific target on each, adds complexity without adding insight — the underlying reality (are you earning genuine, relevant backlinks from real, indexed sites) is what both metrics are imperfectly trying to approximate anyway.

If you're reporting to a stakeholder who's less familiar with SEO nuance, it's worth explaining upfront that these are estimates from two competing companies, not an objective, universally agreed-upon score — that context prevents confusion later when the numbers inevitably don't match a competitor's self-reported figure from the other tool.

What Neither DR Nor DA Actually Guarantees

This is the part that's easy to lose sight of once you're tracking a number every week: neither DR nor DA has ever been confirmed as a Google ranking factor. Google has stated repeatedly that it doesn't use third-party metrics like these in its own ranking algorithm. Both scores are estimates built by SEO tool companies to help their customers compare domains at a glance — useful as a proxy, not a guarantee.

A domain can have a strong DR or DA and still rank poorly due to thin content, poor technical SEO, weak relevance to the search query, or a dozen other factors these link-based metrics don't capture at all. Conversely, a domain with a modest DR/DA can outrank higher-scored competitors if its content and relevance are stronger for a specific query. Treat both metrics as one input among many — a reasonable proxy for "has this domain built up real link equity over time," not a scoreboard that determines rankings directly.

It's also worth remembering that both metrics can be gamed to some degree by low-quality link-building tactics (PBNs, link farms, purchased links from networks built purely to inflate scores) — which is exactly why link-quality metrics like Majestic's Trust Flow exist alongside DR and DA, to catch profiles that look strong on a single blended number but are actually built on manipulation. See our Majestic vs Ahrefs comparison for more on that distinction.

A Worked Example of the Discrepancy

Consider a real pattern that shows up constantly in practice: a five-year-old niche SaaS blog with a steady trickle of links from smaller, topically-relevant sites in its industry. In Ahrefs, this domain might show DR 35 — a solid, unremarkable score reflecting consistent, if modest, referring-domain growth over years. In Moz, the same domain might show DA 28, because Moz's model weighs ranking-correlated signals slightly differently and its index may have picked up a different subset of those smaller referring domains.

Neither number is "more correct." Someone using Ahrefs to evaluate this site as a potential guest-post target would read DR 35 as reasonably strong for its niche; someone checking the same site in Moz would read DA 28 as slightly more modest. Both conclusions are reasonable given the tool each person is using — the mistake would be assuming the two scores should have matched, or trying to average them into a single "true" number that neither company's methodology supports.

This is also why serious link audits often check a prospect domain in both tools rather than relying on either alone — not to reconcile the discrepancy, but to get two independent reads that, taken together, paint a more complete picture than either score in isolation.

Building the Kind of Links That Move Either Metric

Whichever metric you're tracking, the underlying work that moves it is the same: earning genuine, relevant backlinks from real, indexed sites with their own established authority. Directory submissions are one of the more accessible ways to build that foundation early — a batch of listings on indexed, relevant directories adds referring-domain diversity that both DR and DA formulas reward, without requiring the outreach-heavy work of guest posting or resource-page link building.

BacklinkBot submits your product to 100-300+ real, hand-vetted directories from our database of 1,011+, every submission done manually (not automated, which matters because automated submissions get flagged and rejected far more often, and rejected or unindexed links don't move either metric at all). You get a full report with a live proof link for every listing, so you can independently verify each one in whichever tool — Ahrefs, Moz, or both — you've chosen to track.

Check your current Domain Rating for free with our DR checker, or see our full done-for-you plans and pricing if you're ready to start building the link profile behind either number.