The 37.9% Problem: When Ads Compete With Organic Rankings
In one of the most comprehensive analyses of search behavior ever conducted, Ahrefs examined approximately 2.3 million keywords and nearly 5 million top ads to understand the relationship between paid and organic search rankings. The findings reveal a startling inefficiency in how most businesses approach their search strategy.
The study found that 37.9% of websites advertise on keywords where they already rank organically in search results. This means nearly four out of every ten advertisers are essentially paying for clicks they could receive for free through their organic rankings.
This overlap represents more than just wasted ad spend. It signals a fundamental disconnect between paid and organic search strategies--a disconnect that costs businesses millions in unnecessary advertising expenditure while potentially confusing users who see multiple listings from the same company.
According to Ahrefs' comprehensive overlap analysis, this pattern persists across industries of all sizes, suggesting that the issue stems from systemic gaps in how organizations coordinate their search marketing efforts rather than individual strategy failures.
37.9%
Advertisers competing against their own organic rankings
2.3M
Keywords analyzed in the study
4.99M
Top ads examined
Why Advertisers Fall Into This Trap
Understanding why this overlap occurs is crucial to avoiding it. Several structural and psychological factors contribute to this widespread inefficiency:
Campaign Inertia: Many PPC campaigns were established before the websites began ranking organically for their target keywords. Once campaigns are built and running, they rarely get reviewed against organic performance. Teams continue running ads out of habit rather than strategic intent. This extends to broader entity-first content optimization approaches where understanding your topical authority helps identify overlap opportunities.
Competitive Pressure: Marketers often feel compelled to maintain paid visibility on valuable keywords, even after achieving organic rankings. The fear of losing share of voice to competitors can override more rational budget allocation decisions.
Organizational Silos: In many companies, paid and organic search are managed by different teams--or even different agencies--without communication or coordination. Each team optimizes for their own metrics without considering the broader search ecosystem.
Lack of Data Sharing: Even when teams want to coordinate, the tools and reporting systems for PPC and SEO often exist in separate ecosystems, making it difficult to identify overlap opportunities.
Our work with clients across SEO services and PPC management consistently reveals that breaking down these silos delivers measurable improvements in both organic visibility and paid efficiency.
Search Intent: The Critical Factor for Channel Selection
The key to optimizing your search strategy lies not in eliminating all overlap, but in making strategic decisions about when both channels serve legitimate purposes. This decision should be guided by search intent--the underlying reason behind a user's search query.
Understanding search intent helps you determine whether PPC, SEO, or both channels should pursue a particular keyword. Different intent types create different opportunities and risks for channel overlap.
The Four Types of Search Intent
Informational Intent: Users seeking knowledge or answers. These queries often respond well to organic content that provides comprehensive, authoritative information. PPC typically offers less value here unless you're promoting a specific educational product or service.
Navigational Intent: Users trying to reach a specific website or brand. Branded searches often warrant both PPC and organic presence, as multiple listings reinforce brand recognition and capture users at different stages of brand awareness.
Commercial Investigation: Users comparing options before making a purchase decision. This is where PPC and SEO often work best together--paid ads capture attention while organic content provides detailed comparison information through comprehensive keyword optimization strategies.
Transactional Intent: Users ready to make a purchase. Both channels can drive conversions here, but the efficiency calculation differs based on your organic ranking position and cost-per-click.
Backlinko's strategic framework for channel alignment emphasizes that matching channel investment to intent signals is the single most effective way to reduce wasteful overlap while maintaining competitive positioning.
Match your channel investment to the search intent behind each keyword
Transactional Intent
PPC accelerates conversions when organic ranking is below top 3. SEO captures long-term value and reduces cost-per-acquisition over time.
Commercial Investigation
Both channels reinforce each other--ads capture attention while organic content provides detailed comparison information.
Informational Intent
SEO excels at capturing ongoing value through comprehensive content. PPC offers limited ROI unless promoting specific educational products.
Navigational Intent
Branded terms often warrant both channels strategically, reinforcing brand recognition across user touchpoints.
The Cannibalization Question: When PPC Undermines SEO
One of the most contentious topics in search strategy is whether PPC ads steal clicks from organic listings--and the answer is nuanced. Research shows that the interaction between paid and organic results depends on several factors.
Position Overlap Matters Most: When ads appear directly above organic listings, there's measurable impact on click-through rates. Users often click the first result they see, which may be a paid ad rather than an organic listing.
Branded Terms Are Different: For branded searches, multiple listings from the same company typically reinforce rather than cannibalize. Users searching for your brand often recognize and trust your brand listings, whether paid or organic.
Intent Clarity Affects Behavior: Users with clear transactional intent may click paid ads expecting a direct path to purchase, while those in research mode may prefer organic results they perceive as more objective.
The key insight is that cannibalization is situational, not universal. Understanding when it occurs in your specific market allows for strategic optimization rather than wholesale changes. Ahrefs' cannibalization analysis confirms that the interaction varies significantly by industry, keyword type, and ranking position.
Strategic Integration: Making PPC and SEO Work Together
The most effective search strategies don't treat PPC and SEO as competing channels--they recognize them as complementary forces that can multiply each other's effectiveness. When both channels operate strategically, they create more visibility, stronger brand trust, and higher click-through rates than either could achieve alone.
Incremental Lift Theory: Research consistently shows that appearing in both paid and organic results doesn't just split clicks--it often increases total clicks. Users who see your brand in multiple positions develop greater trust and familiarity, making them more likely to click.
SERP Dominance: The modern search results page is crowded. AI summaries, featured snippets, knowledge panels, and other SERP features compete for attention. Having both paid and organic presence ensures your brand occupies more real estate on the page.
Testing and Learning: PPC provides rapid feedback on keyword performance, messaging effectiveness, and landing page conversion. These insights can directly inform SEO content strategy, allowing you to prioritize keywords with demonstrated commercial intent. Additionally, understanding how types of backlinks in SEO influence organic authority helps you make better decisions about which paid keywords are worth maintaining versus pausing.
Backlinko's integration strategies demonstrate that the most successful search programs treat paid and organic as a unified system rather than competing budgets.
Measuring The Overlap: Practical Analysis Methods
Optimizing your search strategy requires systematic analysis of how PPC and SEO currently interact. Here's how to identify and address overlap in your specific situation.
Step 1: Export Your Data
Pull your active PPC keywords from Google Ads or your preferred advertising platform. Export your organic ranking data from your SEO tool of choice. Both datasets should include keywords and their respective positions or ranking ranges.
Step 2: Identify Overlap
Compare the two lists to identify keywords where you appear in both paid and organic results. Calculate your overlap percentage--the number of overlapping keywords divided by your total PPC keywords. LSI keywords can help you discover semantically related terms that strengthen your organic authority while informing PPC keyword selection.
Step 3: Analyze Efficiency
For each overlapping keyword, compare:
- Your ad position versus organic ranking position
- Historical CTR for both channels
- Conversion rates and revenue contribution
- Cost-per-click for the paid version
Step 4: Make Strategic Decisions
Based on your analysis, categorize each overlapping keyword:
- Maintain both (strategic brand terms, high-value commercial terms)
- Pause paid (strong organic position in top 3, low CPC variance)
- Optimize organic (weaker organic position with high-value intent)
Straight North's measurement methodology provides additional frameworks for attributing revenue across channels and proving SEO ROI to stakeholders.
| Metric | What It Tells You | Action Threshold |
|---|---|---|
| Overlap Percentage | Extent of potential wasted spend | Above 20% warrants investigation |
| Position Gap | Relative visibility between channels | Ad within 2 positions of organic |
| CTR Comparison | Which channel users prefer | Significant variance indicates optimization opportunity |
| Conversion Delta | Relative value of each channel | Helps prioritize channel investment |
Common Questions About PPC and SEO Overlap
The Bottom Line: Data-Driven Channel Strategy
The Ahrefs study revealing 37.9% overlap isn't a condemnation of PPC advertising--it's a call for strategic coordination. The goal is not to eliminate all overlap but to make intentional, data-driven decisions about when both channels serve legitimate business purposes.
Key Takeaways:
- Nearly four out of ten advertisers compete against their own organic rankings, representing significant optimization opportunity
- Search intent should guide channel strategy, not habit or competitive pressure
- Some overlap is strategic (branded terms, competitive terms), but much of it is wasteful inefficiency
- PPC data provides valuable intelligence for SEO strategy, and vice versa
- Coordination between paid and organic teams unlocks synergies that neither channel achieves alone
The businesses that win in search are those that treat PPC and SEO as complementary forces rather than competing channels. By understanding the data, aligning your teams, and making strategic decisions about where to invest, you can capture the full value of your search presence without leaving money on the table--or paying for clicks you could get for free.