<b>Q: How many supporting articles does one pillar actually need to "count" as a cluster?</b>

<b>Q: How many supporting articles does one pillar actually need to "count" as a cluster?</b>

Short answer: there's no magic number, but think in terms of subtopic coverage, not post count. A pillar is "complete" when you've answered the questions a knowledgeable reader would still have after reading it.

A practical floor is 6-10 supporting articles, but I've seen a 4-article cluster outrank a 30-article one because the 4 covered every distinct angle and the 30 were thin reslices of the same keyword.

In practice: list every subquestion from People Also Ask, autocomplete, and your own forums. Group near-duplicates. The number of leftover groups is your cluster size. If two "articles" answer the same question, they're one article.

Got a question about cluster sizing? Send it in.