What is a keyword cluster
A cluster consists of a main (head) query, usually the highest volume, and a ‘tail‘ of related phrases, synonyms, and associated questions. By optimizing a page for the head term, you automatically boost rankings for the entire cluster.
Example of a cluster
- Head query: buy iphone 15
- iphone 15 price in moscow
- iphone 15 cost
- order iphone 15 with delivery
- iphone 15 specs
Why keyword clusters are important
- Save resources – one page instead of 5–10
- Higher relevance – full topic coverage
- No cannibalisation – different clusters go to different URLs
- Better user experience – visitors find everything in one place
Clustering is a mandatory step after collecting a semantic core. Without it, you risk creating dozens of thin pages that compete against each other.
FAQ
How do I determine the right cluster size?
Typically 5–20 queries per page. A very small cluster (2–3) is inefficient; a very large one (50+) is hard to cover fully with content.
Can one query belong to multiple clusters?
No, that would cause cannibalisation. Each query should be assigned to exactly one target page.
What if my cluster does not rank?
Check content quality: have you answered all sub‑questions of the cluster? Also review internal linking and backlink profile.