What Is Moz Domain Authority (DA)?

Moz Domain Authority, or DA, is a 1-100 score Moz assigns to predict how well a website is likely to rank in search results, based mainly on the size and quality of its backlink profile. Like Ahrefs DR, it’s a third-party estimate, not something Google publishes or uses directly.

Moz built DA back in 2010 as a way to compare sites at a glance, and it’s stuck around because it’s simple to understand: bigger number, more likely to rank well. The catch is that DA is calculated from Moz’s own link index, which is smaller and structured differently than Google’s actual index, so it’s an educated estimate rather than a direct measurement of ranking power.

How DA Is Actually Calculated

Moz feeds dozens of signals into a machine-learning model, mostly link-related: the number of unique linking root domains, the authority of those linking domains, and how your link profile compares statistically to sites that already rank well. DA moves on a logarithmic curve too, which is why climbing from DA 20 to DA 30 is a lot easier than climbing from DA 60 to DA 70.

One detail people miss: DA is relative, not absolute. Moz periodically recalibrates its whole model against the top-ranking pages in Google, which means your DA number can shift even when nothing about your own site changed, just because Moz adjusted the scale everyone gets measured against. This recalibration is also why DA numbers from two years ago aren’t directly comparable to today’s numbers, even for the exact same site.

Why Agencies and Marketplaces Lean on DA

DA shows up constantly in guest post pricing and link marketplaces because it’s an easy filter buyers understand. A DA 40+ site commands a higher guest post price than a DA 15 site, mostly because buyers assume (correctly, in general) that a link from it carries more weight. That demand is also why DA gets manipulated: PBNs and link farms specifically target DA growth because it’s what buyers check first, sometimes without the actual traffic or relevance to back it up.

The Real Limitation of DA

DA measures your whole domain’s backlink strength, not any individual page’s ranking potential. A site can carry DA 55 overall while a specific blog post on it has almost no links pointing directly at it and struggles to rank for anything competitive. If you’re chasing a keyword, the linked page’s own authority (sometimes called Page Authority, or PA) usually matters more than the domain-wide number. See DA vs PA for that distinction.

DA and Actual Google Rankings

We get asked constantly whether chasing DA is worth it on its own. It isn’t, by itself. DA correlates with ranking ability because both are shaped by backlink quality, but plenty of DA 25 pages outrank DA 45 pages when the lower-DA page targets its keyword more precisely and answers the search intent better. Treat DA as one input into a link building decision, not the finish line. If two potential guest post opportunities are otherwise similar in relevance and traffic, the higher-DA one is usually the better pick. If they’re not similar, relevance wins.

A Realistic Growth Timeline

New domains generally start at DA 1. Reaching DA 20-25 in the first year with steady, relevant link building is a normal outcome. Beyond DA 40, growth slows considerably and requires consistently strong, relevant links over an extended period, not a short campaign. We tell clients the same thing we’d tell a friend: if a vendor promises DA 50 fast, ask exactly which links they’re using, because that speed usually means volume over quality.

DA Recovery After Losing Links

DA can drop when linking sites disappear, get penalized, or remove your link, and recovering it isn’t always as simple as rebuilding the same number of links you lost. Moz’s model weighs relevance and quality, so replacing ten weak, unrelated links with three or four genuinely strong, relevant ones often restores DA faster than matching the old link count one-for-one. If your DA dropped recently, an audit to find exactly which links disappeared is usually more useful than guessing at a replacement campaign.

Checking Your Own DA

Moz’s free Link Explorer tool shows DA for any domain without a paid subscription. Run it on your own site and a couple of real competitors before committing budget to a link campaign, so the target you’re working toward is based on where you actually stand today, not a generic number pulled from nowhere.

DA Inflation and Why Some Sites Show Suspiciously High Numbers

A small number of sites manipulate DA specifically, building large volumes of low-quality links purely to inflate the metric for resale purposes, since a higher DA number lets them charge more for guest posts or link placements. If a site’s DA seems unusually high relative to its actual traffic, content quality, or brand recognition, that mismatch is worth investigating before paying for a placement there.

DA as Part of a Broader Vendor Evaluation

Never evaluate a potential link placement on DA alone. Checking the site’s actual organic traffic, relevance to your industry, and whether real people would plausibly find and read that content gives you a far more complete picture than a single third-party score.

One Practical Tip

Track DA monthly, not daily, since Moz’s slower update cycle makes daily checks mostly noise.

Frequently Asked Questions

Is DA a Google ranking factor?

No. Google has confirmed it doesn’t use Moz DA, Ahrefs DR, or any third-party metric directly. DA correlates with ranking ability because both are influenced by backlink quality, but it isn’t a cause.

Why does my DA change without me building any links?

Moz periodically recalibrates its scoring model against the broader web, and sites you link to (or that link to you) can also change their own authority, both of which shift your number.

Is DA 30 good?

It depends entirely on your niche and competitors. DA 30 might lead a low-competition local market and trail badly in a competitive national one. Compare against your actual competitors, not a generic benchmark.

Can I buy DA directly?

Not safely. Vendors selling “guaranteed DA increase” packages are usually using PBNs or link farms, which Google actively devalues and can penalize. Real DA growth comes from earning links on genuinely relevant, established sites.

Does DA matter more for a new site or an established one?

It matters more early on, when you have little else to differentiate yourself from competitors. As a site matures, actual traffic, conversions, and content depth become the more reliable signals to track.

If you want your Domain Authority to climb with backlinks that also hold up under manual review, our Domain Authority improvement service targets a specific DA range and reports each placement as it’s built. It pairs naturally with our Domain Rating service if you’re tracking both metrics side by side.