Open any backlink checker and you’ll see two numbers side by side: backlinks and referring domains. They look like they measure the same thing — and beginners often treat them as interchangeable. They aren’t.
On this page
- What Is a Backlink?
- What Is a Referring Domain?
- Backlinks vs Referring Domains: The Key Differences
- Backlinks vs Referring Domains: Why the Distinction Matters
- Backlinks vs Referring Domains: Which Metric Should You Track?
- How to Grow Referring Domains Safely
- Common Myths About Backlinks vs Referring Domains
- The Bottom Line
- Frequently Asked Questions
The difference — backlinks vs referring domains — is one of the most practical concepts in link building. Understand it, and you’ll stop chasing the wrong number, spot weak link profiles in seconds, and build links that actually move rankings. In this guide, I’ll explain what each metric counts, why the distinction matters, and which one deserves your attention.
What Is a Backlink?
A backlink is a single hyperlink from one web page to another. That’s it — one link, one backlink. New to the whole concept? Start with our beginner-friendly guide to what backlinks are.
If a blog links to your homepage three times — once in the article body, once in the sidebar, and once in the footer — that’s three backlinks. If a hundred different websites each link to you once, that’s a hundred backlinks too. The metric counts every individual link, no matter where it comes from.
Backlink count is the rawest measure of your link profile. It’s useful as a starting point, but on its own it’s misleading, because it treats all links as equal. Ten links from the same site and ten links from ten different sites both read as “10 backlinks” — yet their SEO value is wildly different. That’s where referring domains come in.
What Is a Referring Domain?
A referring domain is a unique website that links to you at least once. It counts domains, not links.
Take the earlier example: a blog that links to you three times (article, sidebar, footer) counts as one referring domain, not three. A hundred different websites linking to you once each count as a hundred referring domains.
This is the number that search engines care about most. When Google evaluates your site’s authority, it’s essentially asking: how many independent websites vouch for this one? One site linking to you fifty times is one vote of confidence repeated fifty times. Fifty different sites linking to you once each is fifty independent votes — and that carries far more weight.
Most SEO tools (Ahrefs, Moz, Semrush) report both numbers, and they always show the same relationship: your backlink count is higher than your referring-domain count, because many links come from domains that link to you more than once.
Backlinks vs Referring Domains: The Key Differences
Here’s the distinction in plain terms:
| Backlinks | Referring domains | |
|---|---|---|
| What it counts | Every individual link | Each unique linking website |
| Example | 3 links from 1 site = 3 backlinks | 3 links from 1 site = 1 referring domain |
| What it signals | Total link volume | Breadth of endorsement |
| SEO weight | Lower per-link after the first from a domain | Higher — diversity is the ranking signal |
The single most important takeaway: the first link from a new domain is worth far more than the second, third, or fiftieth link from a domain that already links to you. Search engines apply diminishing returns to repeat links from the same source. Your 1,000th backlink might come from your 40th referring domain — and it’s those 40 domains doing almost all the heavy lifting.
Backlinks vs Referring Domains: Why the Distinction Matters
It changes how you read a link profile
When you’re vetting a site — say, before commissioning a guest post — “5,000 backlinks” sounds impressive until you see they come from only 60 referring domains. That ratio (83 links per domain) screams sitewide links, footer links, or a private blog network: patterns that look manipulative. In my experience, a healthy profile usually shows a far lower ratio — often in the low single digits — not 80:1.
Flip it around for your own site. If your checker shows 300 backlinks but only 25 referring domains, your link building isn’t broad enough yet. You’re getting repeat links from the same small circle instead of earning new endorsements.
You can check backlinks and site authority for free with our website authority checker.
It stops you chasing the wrong number
Beginners celebrate every new backlink. Experienced SEOs celebrate every new referring domain. One outreach campaign that lands links on 20 new sites beats a campaign that lands 20 links on 2 sites — even though the backlink count is identical. If you’re following a safe backlink plan for a new website, make “new referring domains per month” your headline metric, not total backlinks.
It explains ranking gaps
Two competitors can have similar backlink counts and very different rankings. The one outranking you almost always has more referring domains — broader endorsement across the web. When I compare my site against competitors, the referring-domain gap tells me how much outreach stands between me and page one. It’s a more honest measure of the authority gap than raw link counts.
It exposes link schemes
Link sellers love quoting backlink counts because big numbers sell. “10,000 backlinks for $50!” sounds like a deal until you learn they come from 12 domains — a textbook footprint of a link farm. Knowing the difference between backlinks vs referring domains is your basic defense against buying garbage links. Always ask for the referring-domain count before you spend money on any placement.
Backlinks vs Referring Domains: Which Metric Should You Track?
Track both, but prioritize referring domains. Here’s a simple framework:
- Referring domains (primary): the number to grow month over month. Set targets like “+15 new referring domains this quarter.” This is the metric most correlated with ranking improvements.
- Backlinks (secondary): watch it for anomalies, not growth. A sudden spike in backlinks without new referring domains often means a sitewide link appeared (good or bad), a scraper copied your content with links, or someone pointed spam at you.
- The ratio: keep an eye on backlinks ÷ referring domains. A steadily rising ratio with flat domain growth means you’re milking the same sources instead of expanding. Healthy link building keeps the ratio roughly stable while both numbers climb.
One caveat: referring domains aren’t all equal either. One link from a respected industry publication outweighs ten links from obscure directories. Domain count is the best single number, but authority and relevance of those domains still matter — which is why metrics like DA vs DR exist as a second layer of analysis.
How to Grow Referring Domains Safely
Knowing the metric is only half the battle. Here’s how to actually increase your referring-domain count without tripping spam filters:
Earn links from new sites, not more links from old ones
When planning outreach, target websites that have never linked to you. A second guest post on a site that already links to you adds a backlink but zero referring domains. Your tenth new-site placement this month is worth more than your tenth link from the same partner blog. Keep a simple spreadsheet of domains you’ve already earned links from, and deprioritize them in future outreach.
Diversify your link types
Different link-building tactics naturally produce different referring domains. Guest posts, podcast interviews, HARO-style journalist quotes, resource-page placements, original data studies, and free tools each open doors to sites the other tactics can’t reach. Learning what podcast backlinks are is worthwhile partly because podcast show notes put your link on domains — podcast websites — that rarely link out otherwise.
Create linkable assets
The most scalable way to grow referring domains is to give people a reason to link. Original research, free tools, definitive guides, and useful templates attract links from sites you’d never reach through outreach alone. One strong asset can earn dozens of new referring domains over its lifetime while you sleep.
Go at a natural pace
A brand-new site gaining 200 referring domains in a week looks manipulated, because it usually is. Aim for steady, believable growth: a handful of new referring domains per month for a new site, scaling up as the site matures. Consistency beats bursts — both for rankings and for staying off Google’s radar.
Common Myths About Backlinks vs Referring Domains
“More backlinks always beat fewer backlinks.” No. 500 backlinks from 15 domains will lose to 150 backlinks from 120 domains in almost every ranking comparison. Diversity wins.
“Referring domains are the only thing that matters.” They’re the best single metric, but relevance and authority still count. A hundred new referring domains from unrelated spam sites can hurt you. Quality of domains matters alongside quantity.
“Sitewide links are worthless.” Not worthless — just heavily discounted. A sitewide footer link from a legitimate partner still counts, but Google treats the 2nd through 500th link from that domain as nearly the same vote. Don’t pay sitewide-link prices for single-vote value.
“You should disavow domains with too many links to you.” Only if they’re spammy or manipulative. Lots of links from one legitimate domain (a partner who references you often) is normal and harmless. Disavow is for toxic domains, not enthusiastic ones.
The Bottom Line
Backlinks count every link; referring domains count every unique website linking to you. The first number measures volume, the second measures endorsement — and endorsement is what moves rankings.
If you take one habit from this guide, make it this: every month, check your referring-domain count, not just your backlink total. Grow the number of different websites that vouch for you, keep the growth steady and natural, and vet every link opportunity by its domain — not its link count.
Both metrics matter, but they answer different questions. Backlink counts tell you about link velocity and campaign output; referring domains tell you about the breadth and resilience of your link profile. Google’s algorithms weight unique domains far more heavily, which is why ten links from ten sites will almost always beat fifty links from two. Make referring-domain growth your primary KPI, audit it monthly alongside your competitors, and prioritize outreach that earns links from sites that have never linked to you before.
Frequently Asked Questions
What is the difference between backlinks and referring domains?
A backlink is any single hyperlink pointing to your site; a referring domain is a unique website that links to you. Three links from one blog equal three backlinks but only one referring domain.
Which is more important, backlinks or referring domains?
Referring domains. Search engines treat each new linking domain as an independent vote of confidence, while repeat links from the same domain carry diminishing returns.
What is a good number of referring domains?
It depends on your niche and competitors, not an absolute number. A useful benchmark: aim to match or exceed the referring-domain counts of the sites currently outranking you for your target keywords.
Can too many backlinks from one domain hurt you?
Not by itself — enthusiastic legitimate linking is normal. It becomes a problem when the pattern looks manipulative, like hundreds of links from low-quality domains built purely for SEO. That’s when the linking domains, not the count, are the issue.
How do I check my referring domains?
Any major SEO tool shows it: Ahrefs (Site Explorer), Moz (Link Explorer), and Semrush (Backlink Analytics) all report referring domains alongside total backlinks. Even free checkers usually show both numbers.
Do nofollow links count as referring domains?
Yes — a nofollow link still comes from a referring domain, and tools count it as one. Nofollow links pass less (or no) ranking value, but they still contribute to a natural-looking, diverse link profile.
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