Referring Domains vs Backlinks: What’s the Difference & Which Matters More?
Open any SEO tool and you’ll see two numbers that look similar but mean very different things: referring domains and backlinks.
Confusing them is one of the most common mistakes in link building strategy, and it leads to wasted budget, inflated reports, and misread progress.
This guide clears it up. You’ll understand exactly what referring domains and backlinks are, how Google uses them differently, which metric to focus on, and how to use both numbers to make smarter link building decisions.
The one-line answer: A backlink is a single link pointing to your site. A referring domain is a unique website that has linked to you. One website can send you 50 backlinks, but it still counts as just one referring domain. Referring domains is the more important metric for SEO growth. |
What Are Backlinks?
A backlink (also called an inbound link or external link) is any hyperlink on another website that points to a page on your site. Every time a page on site A links to a page on your site, that’s one backlink.
Backlinks have been a core Google ranking signal since the PageRank algorithm was introduced in 1998. The underlying logic is simple: if other websites are linking to your content, it’s probably valuable. The more high-quality sites that link to you, the more authority your site accumulates.
A single website can give you multiple backlinks, one from their homepage, one from a blog post, one from a resource page. Each of these counts as a separate backlink in your link profile.
What Are Referring Domains?
A referring domain is a unique website (domain) that has at least one backlink pointing to your site. If TechCrunch links to you from three different articles, that counts as three backlinks but only one referring domain, because all three links come from the same root domain.
Referring domains is a de-duplicated count of the unique websites linking to you. It’s a much harder metric to inflate than raw backlink count, which is why most SEOs treat it as a more meaningful indicator of link profile health.
Referring Domains vs Backlinks: Key Differences
1. One referring domain can produce many backlinks
A publisher that includes your link in ten different articles sends ten backlinks but adds only one referring domain. This is why backlink counts can grow dramatically without any real improvement in your link profile diversity.
2. Google weights referring domains differently from multiple links on one domain
Google’s algorithm gives diminishing returns to multiple links from the same domain. The first link from a high-authority site passes substantial authority. The second link from the same site passes less.
The tenth link passes very little. This is why growing your referring domain count, getting links from more unique websites, is almost always more valuable than getting more links from sites already in your profile.
3. Backlinks are easier to manipulate; referring domains are harder
A spammy link building campaign can generate thousands of backlinks from a handful of low-quality domains. Referring domain count is much harder to inflate artificially because you need genuinely distinct websites to link to you, which is why Google treats it as a stronger signal.
4. Referring domains correlate more strongly with rankings
Multiple studies from Ahrefs, Moz, and SEMrush consistently show that referring domain count has a stronger correlation with organic rankings than raw backlink count. When comparing two pages competing for the same keyword, the one with more unique referring domains usually wins, even if the other has more total backlinks.
Related Post: Link Building Services That Move Rankings
Which Metric Should You Focus On?
Referring domains is the primary metric for measuring link building progress. It tells you how many unique websites trust your content enough to link to it, which is the underlying signal Google is trying to measure.
That said, both metrics matter in context:
- Use referring domains to: Track link building campaign progress, compare your link profile against competitors, set link acquisition targets, and report on authority growth to stakeholders.
- Use backlinks to: Audit your link profile for spam or unnatural patterns, identify which pages on your site are attracting the most links, and spot specific linking opportunities from publishers already in your profile.
- Use both together to: Calculate your backlinks-to-referring-domains ratio. A healthy link profile has a ratio of roughly 3:1 to 5:1. A ratio of 50:1 or higher suggests a small number of domains are sending a disproportionate share of links, which can look unnatural to Google.
How to Grow Your Referring Domain Count
Increasing referring domains requires getting genuinely new websites to link to you, not more links from sites already in your profile. Here’s what works:
1. Original research and data studies
Publishing proprietary data, survey results, industry benchmarks, original analysis, gives journalists and bloggers a reason to link to your site as a source. One well-promoted data study can generate dozens of referring domains from press coverage alone.
2. Digital PR and media outreach
Proactive outreach to journalists, bloggers, and industry publications with a compelling story or unique angle. A single coverage piece in a relevant publication can add a high-authority referring domain that would otherwise take months of link building to acquire.
3. Guest posting on relevant sites
Contributing articles to publications in your niche earns a referring domain with each accepted post. Quality matters, one link from a DR 70 industry publication is worth more than ten links from low-authority guest post farms.
4. Link-worthy resource creation
Building tools, calculators, templates, or comprehensive guides that others in your industry naturally want to reference. These assets attract links passively over time as they get discovered and shared.
5. Broken link building
Finding broken links on relevant websites and suggesting your content as a replacement. This works well for evergreen resource pages and gives the linking site a clear reason to add your domain to their link profile.
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How to Analyse Your Referring Domain Profile
Raw referring domain count is a starting point, but the quality and diversity of those domains matters as much as the number. Here’s how to analyse your profile properly.
- Domain Rating / Domain Authority distribution: What percentage of your referring domains have a DR/DA above 50? Above 70? A profile skewed toward low-authority domains provides limited ranking benefit.
- Topical relevance: Are the domains linking to you in the same or related industries? Niche-relevant referring domains carry significantly more weight than random, off-topic links.
- Geographic distribution: If you serve multiple markets, do your referring domains reflect that? Links from locally relevant domains carry extra weight for geo-specific rankings.
- Follow vs nofollow ratio: A natural link profile has a mix of followed and nofollowed referring domains. An unusually high proportion of nofollow links may signal that you’re getting citations but not full link equity.
- Referring domain growth trend: Is your referring domain count growing month over month? Flat or declining growth is a warning sign that your link building is stalling or links are being lost.
Common Mistakes When Tracking These Metrics
- Reporting backlink count instead of referring domain count as your primary KPI, easily inflated and less meaningful
- Counting new backlinks without tracking lost referring domains, net growth is what matters
- Treating all referring domains equally, a link from a DR 20 directory and a link from a DR 80 industry publication are not the same
- Ignoring the referring domain growth rate of competitors, your absolute count matters less than your count relative to the sites you’re trying to outrank
- Focusing on quantity without filtering for relevance, 100 relevant referring domains will outperform 500 random ones.
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Frequently Asked Questions
1. Is it better to have more backlinks or more referring domains?
More referring domains, consistently. A higher referring domain count from quality, relevant websites is a stronger ranking signal than a high backlink count concentrated on a few domains. Diversity of linking sources is what Google’s algorithm is designed to reward.
2. How many referring domains do I need to rank?
It depends entirely on your competitors. Check the referring domain count of pages currently ranking in positions 1–5 for your target keyword using Ahrefs or Semrush. Your target is to match or exceed that count with comparable or better domain quality.
3. Do referring domains from the same IP address count separately?
Google treats domains on the same IP address or owned by the same entity as potentially related. While multiple referring domains on the same IP subnet do count separately in most tool reports, their collective link equity may be discounted if they appear to be part of a network.
4. What’s a good referring domain growth rate?
For an active link building program, growing referring domains by 10–20% quarter-over-quarter is a healthy target. The right benchmark varies by domain age, starting authority, and investment level — but consistent growth is the key signal.
Final Thoughts
The distinction between referring domains and backlinks is not just semantic. It’s the difference between understanding your link profile and being misled by it.
Referring domains is the metric that tracks the thing Google actually cares about: how many distinct, credible sources trust your site enough to send their audience to you.
Track both, but optimise for referring domain growth. Build links from new, relevant, high-authority websites rather than accumulating more links from sites already in your profile. That’s the path to a link profile that compounds in value over time.