Domain Rating is an Ahrefs metric. Domain Authority is a Moz metric. Neither one is calculated by Google, used by Google's ranking systems, or visible to Google in any way that matters to your rankings. They're third-party estimates of link equity, built to help SEOs compare sites at a glance — genuinely useful for that narrow purpose, and widely mistaken for something much bigger than that.
How this mistake actually costs money
We've reviewed link-building proposals from other agencies that were built almost entirely around a DR threshold: "we'll get you 10 links from DR40+ sites." That's not an unreasonable filter to use as one input. As the entire strategy, it's a proxy metric optimized in isolation from the thing it's supposed to be a proxy for — and optimizing a proxy in isolation is how you end up with links from DR45 sites that get almost no organic traffic, have no topical relevance to your business, and move your actual rankings by close to nothing.
We saw this directly on an account that had spent close to $30,000 with a previous agency on DR-filtered link building over a year. Rankings had barely moved. When we audited the backlink profile, most of the placements were on sites with real DR scores but negligible current traffic and no topical connection to the client's industry — technically meeting the brief, contributing almost nothing to actual search performance.
What actually correlates with ranking improvement
Relevance matters more than raw authority. A DR25 site in your exact niche, with real readers who might plausibly be your customers, tends to move rankings more than a DR60 general-interest site with no topical connection. Google's systems have gotten meaningfully better at evaluating whether a link makes topical sense, and that signal increasingly outweighs raw authority in ways a DR-only filter can't see.
Traffic is a better filter than DR alone. A site with real, current organic traffic is a site Google is actively crawling, indexing, and trusting right now — not a site coasting on link equity built five years ago. We weight this more heavily than DR when evaluating placements, including our own guest post inventory.
A better way to brief a link-building request
Instead of "get me links from DR40+ sites," try: "get me links from sites with real traffic in our industry that a genuine reader in our space might actually land on." It's a harder brief to fill and a much easier one to defend the results of six months later.
DR is a fine sorting tool for a first-pass filter. It's a bad north star. If a link-building proposal you're evaluating uses DR as the only metric in the pitch, that's worth asking about before you sign anything.