B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
20%
20% -- conversion rate lift odd numbers for web content headlines (2025)
Using odd numbers in headlines can make the conversion rate 20% higher.
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
20%
Unit
Percentage
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
nightwatch.io
Primary
Tier C
https://nightwatch.io/blog/a-guide-to-creating-rad-content-that-works-for-humans-and-seo/ ↗
Source Article
A Guide to Creating Rad Content That Works for Humans and SEO
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A Guide to Creating Rad Content That Works for Humans and SEO
SEO Copywriting: Crafting Content for Humans and Search Engines
SEO professionals are in an eternal battle with a bunch of robots.
If only this were a cool Terminator 2 scenario. Well, maybe one day. For now, we are only up aga…
Original Research
nightwatch.io
· Original study ↗
Methodology
Claim that odd numbers in headlines increase conversion rate by 20%
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
web content headlines: 20% conversion rate lift odd numbers. Source: nightwatch.io (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/odd-number-headlines-20-percent
HTML Embed
<blockquote cite="https://lighthousedata.io/data/odd-number-headlines-20-percent" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>20%</strong> -- conversion rate lift odd numbers for web content headlines<br><small>Source: nightwatch.io (2025) · <a href="https://lighthousedata.io/data/odd-number-headlines-20-percent" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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