Internal linking turns external authority into usable SEO value. A backlink can bring authority to one page, but internal links decide how that authority moves through the rest of your website.
This matters before you invest in link building services. If your internal linking structure is weak, even strong backlinks may fail to lift the pages that need rankings most.
Internal linking benchmarks show where SEO value is leaking
Internal linking benchmarks help you measure whether important pages are connected, crawlable, and supported by enough contextual links. Google says links help it discover pages, understand relevance, and evaluate how pages relate to each other. Google also recommends crawlable <a> links with clear href attributes and descriptive anchor text.
A Zyppy study analyzed 23 million internal links across 1,800 websites and about 520,000 URLs. The study found that URLs with 0–4 incoming internal links averaged 2 Google Search clicks, while URLs with 40–44 incoming internal links averaged about 4 times more clicks. The same study warns that the data is correlational, not proof of causation.
| Benchmark area | Practical target | Why it matters |
| Incoming internal links to key pages | 20–40+ where relevant | Helps important pages receive stronger site signals |
| Orphan pages | 0 | Pages with no internal links are harder to discover |
| Crawl depth for money pages | Within 3 clicks | Keeps priority pages close to the homepage or hub pages |
| Anchor text | Descriptive and varied | Helps users and Google understand page context |
| Generic anchors | Keep minimal | “Click here” gives weak topical context |
Pages with more internal links often earn more organic traffic
Pages with more relevant internal links usually have a better chance of being found, crawled, and understood. Backlinko explains that internal links help Google find, index, and understand pages, while also helping users navigate the site.
The practical lesson is simple: do not build links only to your homepage. A professional SEO link building agency should also ask where that authority will flow internally.
Strong internal linking connects these page types:
- Homepage to main service pages
- Pillar pages to supporting blog posts
- Blog posts back to commercial pages
- High-traffic pages to underperforming money pages
- New content to older authority pages
The 40–44 internal link benchmark is useful but not absolute
The 40–44 internal link range should be treated as a directional benchmark, not a rule. Zyppy’s data showed stronger traffic around that range, but the study itself states that correlation does not equal causation.
A small local service page may not need 40 internal links. A major SaaS product page, marketplace category, or national service page may need far more internal support.
The better question is not “How many links should this page have?” The better question is “Does this page receive enough relevant links from pages that already have authority, traffic, and topical alignment?”
Anchor text benchmarks matter more than most teams admit
Anchor text tells users and search engines what the linked page is about. Google says anchor text should be placed inside crawlable links and should help people and Google understand the destination page.
Poor anchor text wastes internal link value. Generic anchors like “click here,” “learn more,” and “read this” give weak context.
Better anchors are specific:
| Weak anchor | Better anchor |
| Click here | affordable link building services |
| Read more | SEO link building packages |
| Learn more | white hat link building services |
| This page | internal linking strategy guide |
| Services | professional link building agency |
Backlinko recommends keyword-rich anchor text for internal links, but also warns against making every anchor exactly the same. The safer benchmark is descriptive variation, not mechanical repetition.
Internal links should support link building services for SEO
Internal links make link building services more effective by distributing authority from backlink-supported pages to other important URLs. A backlink building service may earn links to blog assets, reports, or guides, but those assets must internally link to revenue pages.
This is where many campaigns fail. They buy link building services, get backlinks to informational posts, and never connect those posts to commercial pages.
A better structure looks like this:
- Build backlinks to a useful, linkable asset.
- Add contextual internal links from that asset to related service pages.
- Link from service pages back to supporting guides where helpful.
- Monitor crawl depth, impressions, clicks, and rankings.
- Refresh internal links when new content goes live.
Crawlable links are a non-negotiable benchmark
Crawlable links must use proper HTML anchors with real href attributes. Google says it can generally crawl links only when they are written as <a> elements with href attributes. Links built only with script events or unsupported formats may not be reliably parsed.
This benchmark is technical, but it is not optional. If Google cannot crawl the link reliably, the internal link may not pass the intended discovery or relevance signal.
Every internal linking audit should check:
- Links use crawlable HTML.
- Important links are not hidden behind broken JavaScript.
- Internal links do not point to redirected URLs where avoidable.
- Important pages are not blocked by robots.txt or noindex tags.
- Navigation, breadcrumbs, and contextual links work together.
Internal link audits should happen at least twice per year
Internal link audits prevent older content from becoming disconnected. Backlinko recommends auditing internal links once or twice per year and notes that new content is often published without older posts being updated to link to it.
For active SEO sites, twice per year is the minimum. For sites publishing weekly, quarterly audits are more realistic.
A serious audit should review:
| Audit item | What to check |
| Orphan pages | Pages with zero incoming internal links |
| Crawl depth | Priority URLs buried too deep |
| Anchor duplication | Same anchor targeting different pages |
| Link concentration | Too many links going to low-value pages |
| Commercial support | Service pages lacking links from authority content |
Internal linking and backlinks should be planned together
Internal linking and backlinks are separate SEO systems, but they should not be managed separately. Link building agencies often focus on external placements, while on-page teams handle internal links later. That creates a gap.
The smarter workflow is to map internal links before outreach begins.
A high quality backlinks service should know:
- Which page will attract links
- Which commercial page needs authority
- Which internal anchor text will connect them
- Which supporting pages should reinforce the cluster
- Which KPI will prove the campaign worked
This approach makes outsource link building more measurable. It connects backlinks, internal links, rankings, and business outcomes in one system.
Internal link benchmarks for different website types
Internal linking benchmarks change by site size and business model. A 30-page local business site does not need the same structure as a 50,000-page marketplace.
| Website type | Internal linking priority | Suggested benchmark |
| Local business site | Service pages and location pages | Keep money pages within 2–3 clicks |
| SaaS website | Features, use cases, and comparison pages | Link from blogs to product pages |
| eCommerce site | Categories, collections, and buying guides | Strengthen category pages from guides |
| Link building marketplace | Service, package, and provider pages | Connect informational and commercial pages |
| Agency site | Case studies, service pages, and blogs | Use proof pages to support service pages |
Conclusion
Internal linking benchmarks expose whether your website can actually benefit from link building services. Backlinks bring authority into the site, but internal links decide whether that authority reaches the pages that matter.
The strongest benchmark is not a fixed number. The strongest benchmark is a connected site where important pages are crawlable, close to authority sources, supported by descriptive anchors, and linked from relevant content.
