B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
5
5 -- keyword cluster size for SEO keyword clusters for narrow topics (2025)
According to SEO.ai's research, effective keyword clusters for narrow topics range from 5 to 10 keywords.
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
5
Unit
Count
Data Vintage
2025
Entity
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
50
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
SEO.ai
Primary
Tier C
https://organicseo.org/blog/seed-keyword-expansion-semantic-clusters ↗
Source Article
Seed Keyword Expansion: Build Semantic Clusters Without Tools
The Seed Keyword Expansion Playbook: Moving Beyond Single Terms to Semantic Clusters Without Tool Dependency
Google's algorithmic evolution from Hummingbird through BERT and MUM turned single-keyword targeting into a losing strategy.
The Seed Keyword Expansion Playbook: Moving Beyond Single Terms to…
Original Research
SEO.ai
· Original study ↗
Methodology
Reported range 5-10 keywords; midpoint 7.5 extracted. No publication date given for SEO.ai cluster-sizing research; vintage reflects contemporary article citation.
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
SEO keyword clusters for narrow topics: 5 keyword cluster size. Source: SEO.ai (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/seoai-narrow-topic-keyword-cluster-size
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<blockquote cite="https://lighthousedata.io/data/seoai-narrow-topic-keyword-cluster-size" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>5</strong> -- keyword cluster size for SEO keyword clusters for narrow topics<br><small>Source: SEO.ai (2025) · <a href="https://lighthousedata.io/data/seoai-narrow-topic-keyword-cluster-size" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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