Share of voice (SOV) is a marketing metric measuring what percentage of total category exposure — across advertising, organic search, social media, or brand mentions — your brand captures versus all competitors combined. Calculated as your brand's metric divided by the total market metric multiplied by 100, SOV with a value exceeding your market share percentage predicts future growth — a relationship proven across advertising effectiveness research.
Most marketing metrics are lagging — they tell you what happened after the fact. Share of voice is different. When your SOV exceeds your market share, future growth almost always follows. It is one of the few metrics that looks forward, not back.
What is share of voice?
Share of voice is a measure of how present your brand is in everything said in your market relative to all competitors. Originally a broadcast advertising metric — measuring what share of total advertising spend or impression volume a brand owned — SOV has been adapted for digital marketing contexts including organic search, paid search, social media, and earned media.
The core formula is consistent regardless of channel:
Example: Your brand's organic search traffic = 120,000 visits/month
Total estimated traffic across all competitors = 800,000 visits/month
Your organic SOV = (120,000 / 800,000) x 100 = 15%
The "metric" varies by channel: ad impressions for paid advertising, estimated organic traffic for SEO, social media mentions for brand monitoring, or audience reach for broadcast.
Share of voice by marketing channel
Organic search SOV (SEO share of voice)
Organic SOV in SEO measures what proportion of the total estimated organic search traffic across a defined keyword set flows to your site versus competitors. It is typically calculated as a visibility score weighted by search volume and ranking position.
Tools that measure organic SOV:
- Ahrefs — Organic Traffic metric and Share of Voice in rank tracking
- Semrush — Visibility percentage in position tracking; Domain vs. Domain analysis
- Sistrix — Visibility Index, one of the longest-running SOV proxies in SEO
- Moz — Share of Voice metric in rank tracking campaigns
Paid search SOV
In Google Ads, SOV is measured through two metrics in the Auction Insights report:
- Impression share — percentage of eligible impressions your ads actually received versus the total available
- Absolute top impression share — percentage of times your ad appeared in position 1 of paid results
Social media SOV
Social SOV measures the share of total brand or topic mentions in your category that belong to your brand versus competitors. Measured using social listening tools — Brandwatch, Sprout Social, Mention — across platforms that allow API-based monitoring.
Share of local voice
In local SEO, share of local voice (SoLV) measures how often your Google Business Profile appears in the local pack or map results for a defined set of local keywords, often tracked across multiple geographic grid points to account for proximity effects.
The SOV-to-market-share relationship
The most important thing to understand about share of voice is its predictive relationship with market share. This relationship was formally documented in research by advertising effectiveness experts, and has been consistently validated across industries.
The principle: brands with an excess share of voice — where their SOV exceeds their current market share — tend to grow their market share over time. Brands with a deficit (SOV below market share) tend to lose market share.
Les Binet and Peter Field's analysis of the IPA Effectiveness Databank (the industry's largest database of advertising effectiveness case studies) found that brands investing in "share of voice" above their market share are statistically likely to gain market share in the following period. This held across both B2B and B2C markets.
This matters because it gives brands a planning framework:
- If your market share is 10% and your SOV is 15%, you have +5% "excess SOV" — a growth signal
- If your market share is 10% and your SOV is 7%, you have -3% SOV deficit — a warning signal
- The strategic goal is to maintain SOV at or above market share, with excess SOV as a driver of growth
How to improve your share of voice
For organic search SOV
- Map your keyword universe. Define the full set of keywords your category competes for. Include informational, commercial, and transactional intent keywords. This is your SOV measurement universe.
- Identify your biggest gaps. Which keyword clusters are competitors dominating where you have little presence? These represent the highest-SOV-per-investment opportunity.
- Build topical authority. Google rewards sites that cover topics in depth. A pillar-and-cluster content strategy systematically increases organic visibility across your keyword universe.
- Win SERP features. Featured snippets, People Also Ask, and local pack positions often represent disproportionate SOV within a keyword — winning them can double your visibility for a single keyword.
For paid search SOV
- Monitor your Impression Share in Google Ads regularly
- Investigate whether SOV gaps are driven by budget (budget-constrained IS) or bid strategy (rank-driven IS)
- Use competitor analysis (auction insights) to understand who is taking the impression share you are losing
For social media SOV
- Track brand mentions alongside competitor mentions using social listening tools
- Increase earned media through PR, influencer partnerships, and shareable content that generates brand mentions without paid amplification
- Monitor sentiment alongside volume — high mention share with negative sentiment is a liability, not an asset
How to track share of voice
| Channel | Metric | Tool(s) | Reporting frequency |
|---|---|---|---|
| Organic search | Organic visibility / traffic share | Ahrefs, Semrush, Sistrix | Weekly or monthly |
| Paid search | Impression share | Google Ads Auction Insights | Weekly |
| Social media | Brand mention share | Brandwatch, Sprout, Mention | Monthly |
| Local SEO | Local pack visibility | BrightLocal, Local Falcon | Monthly |
Common share of voice mistakes
- Measuring SOV on too narrow a keyword set. If you only track branded keywords, your SOV looks artificially high. Your measurement universe should include all category keywords — including those you do not yet rank for.
- Conflating SOV with quality. A brand can have high SOV but negative sentiment — which is worse than low SOV with positive sentiment. Always pair SOV measurement with sentiment or quality signals.
- Ignoring non-search channels. For brand-heavy categories, social media SOV or earned media SOV may be more predictive than organic search SOV. Measure the channels most relevant to your buying journey.
- Using SOV as a vanity metric without connecting it to market share planning. SOV is only useful if you know your market share and are tracking whether your SOV is generating excess or deficit against it. Measure both or the signal is context-free.
Frequently asked questions
Share of voice (SOV) is the percentage of total advertising, search visibility, or brand mentions in a market category that your brand owns. The formula is: SOV = (Your brand's metric / Total market metric) x 100. SOV can be measured across paid advertising, organic search, social media, and earned media.
SEO share of voice is typically calculated as: (Your estimated organic traffic from a keyword set / Total estimated organic traffic from that keyword set across all ranking sites) x 100. In practice, most SEO platforms estimate this as a visibility score weighted by keyword search volume and your average ranking position.
Research by Les Binet and Peter Field established that brands with a share of voice higher than their market share tend to grow market share over time — and vice versa. If your SOV is 20% but your market share is 15%, you have 'excess share of voice' and are likely to gain market share. This makes SOV a leading indicator of revenue growth.
There is no universal benchmark. The goal is not an absolute number but a positive SOV-to-market-share ratio. If your market share is 10%, you want your SOV to be at least 10% and ideally higher. Excess SOV — SOV greater than market share — is the signal that indicates future growth.
Market share measures actual revenue or sales as a proportion of the total market — a lagging indicator. Share of voice measures brand exposure or visibility in the market — a leading indicator. Because SOV influences future purchase decisions through awareness and consideration, it tends to move before market share does, making it useful for brand planning.
Related glossary terms
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