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Share of Voice

General

Brand Share of Total Market Advertising Presence

The percentage of total advertising or brand mentions in a market that belong to a specific brand, used to measure competitive visibility across paid, organic, and social channels.

Definition

Share of Voice (SOV) measures the proportion of total advertising activity or brand presence in a market that belongs to your brand. It is a competitive metric that tells you how visible your brand is relative to competitors across a specific channel (paid media, organic search, social media, or PR mentions).

The concept originated in traditional media buying, where SOV literally meant your percentage of total category advertising spend (or GRP — Gross Rating Points). It has since expanded to cover organic search visibility, share of social media mentions, and even physical shelf space.

SOV is strategically important because of its proven relationship with market share growth: research consistently shows that brands with a SOV above their market share tend to grow, while those below tend to shrink — the excess SOV (eSOV) principle.

Formula

SOV = (Your Brand's Metric / Total Market Metric) × 100

The metric varies by channel:

  • Paid SOV: Your ad spend ÷ Total category ad spend × 100
  • Organic SOV: Your organic impressions ÷ Total tracked keyword impressions × 100
  • Social SOV: Your brand mentions ÷ Total category mentions × 100
  • Impression SOV: Your impressions ÷ Total competitor impressions × 100

Worked Example

A payments app competes with four other apps. Tracking 5 target keywords over a month, total search impressions in the category = 2,000,000. Your app's organic impressions = 540,000.

Organic SOV = 540,000 / 2,000,000 × 100 = 27%

If your app holds 20% of the market in payment volume, your SOV (27%) exceeds your market share (20%) — meaning you have positive eSOV of 7 percentage points. This predicts market share growth if the pattern is sustained.

Use the share of voice calculator to track SOV across competitors.

Key Things to Know

  • Excess SOV (eSOV) = predicted growth: The IPA's empirical research across hundreds of campaigns found that for every 10 points of excess SOV, market share grows ~0.5% per year. This makes SOV a leading indicator of future revenue.
  • Define the competitive set carefully: SOV is only meaningful relative to a defined category. A fitness app measuring SOV against "all mobile apps" would get a meaninglessly low number. Define the competitive set as direct substitutes.
  • Impression SOV vs spend SOV: Impression SOV accounts for efficiency — a brand with a lower budget but better targeting may achieve higher impression SOV than its spend SOV would suggest.
  • ROAS vs SOV: ROAS measures short-term return on ad spend. SOV is a long-term brand building metric. Brands that optimise purely for ROAS often let SOV erode, hurting future performance. Effective marketing balances both.
  • Share of search as a proxy: "Share of search" — your brand's share of total Google searches for brand names in the category — is a free, high-frequency SOV proxy that correlates strongly with market share. It is measurable via Google Trends or Search Console.

Related Calculators

Share of Voice Calculator →Calculate your brand's share of voice (SOV) against the total market. Measure what percentage of industry mentions, impressions, or ad spend belongs to your brand versus competitors.
Marketing ROI Calculator →Calculate marketing ROI from revenue, marketing spend, and gross margin. Justify your marketing budget with a clear ROI percentage, net profit, and ROAS — free online calculator.
SEO ROI Calculator →Calculate SEO ROI from organic traffic, conversion rate, average order value, and equivalent CPC savings. Justify your SEO spend with concrete revenue and traffic value metrics.

Related Terms

ROASReturn on Ad SpendCPMCost Per Mille (Cost Per Thousand Impressions)CPCCost Per ClickOrganic Traffic ValueEstimated Monetary Value of Organic Search Traffic

Frequently Asked Questions

Market share measures your brand's share of actual sales or revenue in a category. Share of Voice (SOV) measures your share of visibility — advertising spend, impressions, or brand mentions. The SOV-market share relationship: when your SOV exceeds your market share, you are likely to grow market share over time. This excess SOV (eSOV) principle, established by Jones (1990) and supported by IPA data, is one of the strongest predictors of brand growth.
Organic SOV is typically measured as your brand's share of total impressions or clicks across a defined set of tracked keywords. SOV (organic) = Your impressions ÷ Total impressions in the category × 100. Tools like SEMrush, Ahrefs, and Google Search Console provide the data. Define your keyword universe carefully — too broad and the numbers are meaningless; too narrow and you miss competitive context.
There is no universal benchmark — it depends entirely on the competitive landscape. In a market with 10 equal competitors, a baseline SOV would be 10%. If you have 30% SOV but only 20% market share, you are over-investing in advertising relative to your size, but you may be growing. If your SOV drops below your market share, your brand is under-investing and market share is likely to erode.
Yes — social SOV is often called 'share of voice in social' or 'social mentions share'. It measures what percentage of brand mentions in your category belong to your brand. Tools like Brandwatch, Sprout Social, and Mention track social mentions across platforms. Social SOV = Your brand mentions ÷ Total category mentions × 100. It is a useful real-time signal of brand visibility and reputation.
SOV primarily affects the awareness (top) stage of the funnel — it determines how many people encounter your brand at all. High SOV builds familiarity and trust over time (the mere exposure effect), which makes conversion easier at lower funnel stages. Brands that neglect SOV in favour of pure performance marketing often find their conversion costs rising over time as brand familiarity erodes.