What Is Optimal Link Density? Calculating the Right Link-to-Word Ratio for Your Articles
"How many internal links should this post have?" is one of the most common questions in internal linking, and most of the answers you'll find are a fixed number: three links, five links, one link per heading. Fixed numbers are easy to remember and almost always wrong, because they ignore the one variable that actually matters: how long the post is.
Why a fixed link count doesn't work
A rule like "add three internal links to every post" treats a 150-word announcement the same as a 3,000-word guide. Three links in a short update is already a lot, one every fifty words or so. The same three links spread across a long, thorough guide would barely register. Link count on its own doesn't tell you anything useful. What matters is density - links relative to how much content surrounds them.
A rough starting range
There's no universally agreed number here, and be wary of anyone who states one with total confidence. That said, a useful starting heuristic used by a lot of experienced SEO writers is roughly one internal link for every 150 to 300 words of body content, adjusted up or down based on how much genuinely relevant content you have to link to. Treat it as a loose guardrail, not a target to hit exactly.
- A 300-word post: maybe zero to one link. Forcing more just to hit a quota usually means linking to something only loosely related.
- A 1,000-word post: three to five links spread naturally through the sections, roughly where a reader would want to go deeper on a point.
- A 3,000-word guide: ten to fifteen or more can feel entirely natural, since there's enough surface area for that many genuine tangents and references.
Where the links sit matters too
Density is only half the picture. Ten links packed into the first two paragraphs reads very differently from the same ten links spread evenly across a long post, even though the ratio is identical. Aim to place links where a reader would naturally want more detail, not just wherever a relevant keyword happens to appear. A cluster of links crammed into the introduction usually means they were added after the fact rather than written in as part of the piece.
Relevance still outranks the ratio
None of this is a reason to pad a short post with links it doesn't need, or to hold back on a long post that genuinely has more to link to. If we covered the risks of overlinking in an earlier piece, density is really the same idea from the other direction: a useful sanity check, not a rule to satisfy at the expense of relevance. A single well-placed link that sends a reader somewhere genuinely useful beats five links added purely to hit a ratio.
Putting it into practice
A practical way to apply this without doing math on every post: write the piece first, then do a pass specifically for internal links once it's done. Look for sentences or claims that reference something you've covered elsewhere, and check the result against the rough ranges above. If you're well under range, look for genuinely relevant older posts you might have missed, including ones that risk becoming orphan pages if nothing links to them. If you're well over, remove the weakest links rather than the strongest ones.
This kind of pass gets harder to do from memory as your site grows past a few dozen posts, since you can't realistically hold every past article in your head while writing a new one. That's the specific gap tools like OrdoLink are built for: surfacing relevant older posts ranked by how well they actually fit, so the linking pass takes minutes instead of a memory exercise.