The first time someone explained share of voice to me, I thought it was just another vanity metric. You measure how much you're spending on advertising relative to your competitors, express it as a percentage, and then... what? But then I learned about the ESOV rule, and everything clicked. Share of voice isn't just a measurement of how loud you are. It's a predictor of future market share growth. That changes everything about how you should think about this metric.
Share of voice (SOV) measures a brand's visibility in the market as a percentage of total category activity, whether that activity is measured in ad spend, social media mentions, search visibility, or media coverage. According to Nielsen's 2025 analysis, SOV refers to a brand's media spending expressed as a percentage of all media expenditures in the category, in that market, on that channel, and at that particular point in time.
But the modern definition extends well beyond paid media. In 2026, share of voice encompasses paid, earned, owned, and shared media channels, making it a holistic measure of brand presence.
The ESOV Rule: Why Share of Voice Predicts Growth
This is the part that turns SOV from an academic exercise into a strategic weapon.
Excess Share of Voice (ESOV) is the difference between your share of voice and your share of market. When SOV exceeds SOM (share of market), the brand tends to grow. When SOV falls below SOM, the brand tends to decline.
The most robust evidence for this comes from Binet and Field's analysis of the IPA Databank, which analyzed over 800 campaigns across decades of data. Their finding: a 10-point positive ESOV produces roughly 0.5 percentage points of market share growth per year.
Let me put that in practical terms:
Brand's Market Share | Brand's Share of Voice | ESOV | Predicted Annual Market Share Change |
15% | 20% | +5 points | +0.25% growth |
15% | 15% | 0 points | Roughly stable |
15% | 10% | -5 points | -0.25% decline |
15% | 25% | +10 points | +0.5% growth |
This relationship has been called "the closest thing to a law of gravity that exists in marketing." According to Semetis's analysis of ESOV-driven growth, the rule holds across categories, geographies, and time periods, though the magnitude varies.
The Four Types of Share of Voice
Modern marketers track SOV across multiple dimensions because brand visibility is no longer concentrated in a single channel.
Paid Media SOV
The original and most traditional form. It measures your advertising spend as a percentage of total category ad spend. If the total category spends $100 million on advertising and your brand spends $15 million, your paid media SOV is 15%.
This remains the foundation for the ESOV calculation and connects directly to competitive parity budgeting decisions. The IPA research was primarily based on paid media SOV.
Earned Media SOV
Your brand's share of mentions in news outlets, blogs, and editorial content. This is typically the domain of PR teams. A brand that generates significant press coverage can achieve high earned media SOV without proportional ad spend.
Social Media SOV
Your brand's share of social media conversations, mentions, and engagement within your category. According to Sprout Social's SOV measurement guide, social SOV is particularly valuable for brand awareness because it reflects real-time consumer conversations rather than just paid or algorithmic visibility.
Organic Search SOV
Your brand's visibility in organic search results for category-relevant keywords. This connects directly to SEO strategy and is increasingly important as search becomes a primary discovery channel. Tools from Ahrefs, Semrush, and Moz all offer SOV tracking for organic search.
SOV Type | What It Measures | Primary Team | Key Tools |
Paid Media | Ad spend share | Media/Advertising | Nielsen, Kantar, MediaRadar |
Earned Media | Press and editorial mentions | PR/Communications | Cision, Meltwater, Muck Rack |
Social Media | Social conversations and mentions | Social/Community | Sprout Social, Brandwatch, Talkwalker |
Organic Search | Search visibility for category keywords | SEO | Ahrefs, Semrush, Moz |
Real-World Examples
Furniture category dominance (2024). According to Nielsen's analysis, four companies dominated the furniture category with more than half of all media spend in 2024: Wayfair, Sleep Number, Rooms to Go, and Ashley Furniture. What's interesting is how they allocated differently. Rooms to Go spent more on TV and print; Ashley spent comparatively more on digital; Sleep Number invested heavily in audio. Same SOV battle, different channel strategies.
Dollar Shave Club's launch. When Dollar Shave Club entered the razor market, their initial advertising budget was a fraction of Gillette's. But their viral video campaign generated massive earned and social media SOV that far exceeded their paid investment. This is the ESOV multiplier effect: creative quality can make a small budget perform like a large one.
Airbnb's 2020 pivot. Airbnb cut virtually all performance marketing during the pandemic and shifted to brand marketing. Their SOV actually increased in meaningful conversations about travel, and they emerged with stronger brand equity and higher brand power than before the cuts.
The Creativity Multiplier
One of the most important findings from the IPA Databank is that SOV quantity alone doesn't determine outcomes. Creative quality acts as a multiplier.
According to Selfstorming's analysis of the ESOV law, creatively awarded campaigns deliver significantly greater market share growth than non-awarded ones. "Fame" campaigns (those designed to be talked about and shared) can be up to 10 times more efficient than standard rational messaging.
This is why I push back when brands treat SOV as purely a budgeting exercise. Yes, you need to spend enough to maintain positive ESOV. But spending more on mediocre creative is far less effective than spending the same amount on distinctive, emotionally resonant work. The quality of voice matters as much as the quantity.
How to Calculate Share of Voice
The basic formula is straightforward:
SOV = (Your Brand's Metric / Total Category Metric) × 100
For paid media: SOV = (Your ad spend / Total category ad spend) × 100
For social: SOV = (Your brand mentions / Total category mentions) × 100
For search: SOV = (Your impressions for target keywords / Total search impressions) × 100
The challenge is getting accurate category-level data. Paid media SOV requires competitive spend tracking through services like Nielsen Ad Intel or Kantar. Social SOV requires comprehensive social listening tools. Search SOV requires robust SEO platforms.
Modern Challenges: Is the ESOV Rule Still Valid?
I want to be honest about the limitations. The IPA's own research has raised questions about whether the ESOV relationship holds as strongly in today's fragmented media landscape.
As the IPA's blog post on ESOV notes: "Twenty years ago, the relationship between ESOV and market share growth was reliable in a world of unfettered attention to a few monolithic media platforms. In today's more fragmented modern media environment, you could spend the same amount of money to achieve the same theoretical ESOV and not get the same return."
According to Michael Brito's 2025 analysis of rethinking SOV measurement, the solution isn't to abandon SOV but to evolve how we measure it. Attention quality, not just quantity, needs to be factored in. A 30-second YouTube pre-roll that gets skipped at 5 seconds shouldn't count the same as a 30-second spot watched to completion.
How SOV Connects to Other Marketing Metrics
Share of voice doesn't exist in isolation. It connects to advertising awareness (SOV drives awareness), advertising reach and frequency (which determine how SOV translates to consumer exposure), impressions (the atomic unit that builds SOV), GRP and CPM (which determine the cost efficiency of achieving SOV).
The strategic implication is clear: if you're not tracking SOV, you're flying blind on whether your brand is gaining or losing ground in the attention economy.
Frequently Asked Questions
What is share of voice in marketing?
Share of voice is a metric that measures your brand's visibility in the market as a percentage of total category activity across paid media, earned media, social media, and organic search.
How do you calculate share of voice?
Divide your brand's metric (ad spend, mentions, impressions) by the total category metric and multiply by 100. For example: ($5M brand spend / $50M total category spend) × 100 = 10% SOV.
What is excess share of voice (ESOV)?
ESov is the difference between your share of voice and your share of market. Positive ESOV (spending above your weight) predicts market share growth. Negative ESOV predicts decline.
Who discovered the ESOV rule?
Les Binet and Peter Field, through their analysis of the IPA Databank, quantified the relationship between ESOV and market share growth across 800+ campaigns.
How much ESOV do you need to grow market share?
The benchmark is roughly 0.5 percentage points of market share growth for every 10 points of positive ESOV, though results vary by category and creative quality.
Is share of voice the same as market share?
No. Market share measures actual revenue or units sold. Share of voice measures visibility and attention. SOV is a leading indicator; market share is a lagging one.
Does creative quality affect share of voice effectiveness?
Absolutely. Creatively awarded campaigns are up to 10x more efficient at converting SOV into market share growth than standard campaigns.
Is SOV still relevant in a fragmented media landscape?
Yes, but it requires more nuanced measurement. Attention quality, not just spend quantity, matters more than ever in 2026.
Sources & References
- Nielsen. "Need to Know: What is Share of Voice?" 2025. https://www.nielsen.com/insights/2025/what-is-share-voice/
- Binet, Les and Peter Field. The Long and the Short of It. IPA, 2013.
- IPA. "ESOV: An Excessive Focus on the Wrong Thing?" https://ipa.co.uk/knowledge/ipa-blog/esov-an-excessive-focus-on-the-wrong-thing
- Sprout Social. "Share of Voice Definition: How to Measure It." https://sproutsocial.com/insights/share-of-voice/
- Semetis. "Using Extra Share of Voice (ESOV) to Drive Long-Term Growth." https://www.semetis.com/en/resources/articles/using-extra-share-of-voice-esov-to-drive-long%E2%80%91term-growth-balancing-brand-building-and-performance
- Selfstorming. "Excess Share of Voice (ESOV): The Mathematical Inevitability of Buying Your Way Out of Mediocrity." https://www.selfstorming.com/tools/libraries/marketing-laws/excess-share-of-voice
- Brito, Michael. "Rethinking Share of Voice Measurement in 2025." https://www.britopian.com/research/share-of-voice-measurement/
- Talkwalker. "Share of Voice: Definition + How to Measure and Grow It in 2025." https://www.talkwalker.com/blog/measure-share-voice
Written by Conan Pesci | April 5, 2026 | Markeview.com
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