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Audience Intelligence Glossary

What Is Share of Voice?

Share of voice is the proportion of category media presence that belongs to one brand. It is the classical measure of how loud a brand is relative to its competitors — an input the brand controls, not an outcome it earns.

The term covers three different measurements, and reports often move between them without saying so:

  • Paid share of voice — the brand's share of category advertising spend or impressions. The original meaning, and the one used in media planning.
  • Earned share of voice — the brand's share of editorial mentions in a defined media set. Used in communications reporting.
  • Social share of voice — the brand's share of mentions in social conversation. The noisiest of the three, and the most sensitive to how mentions are counted.

The formula

Share of voice = (brand's media presence) ÷ (total media presence of all brands in the category)

Presence = spend, impressions, mentions or reach — whichever the definition names

Excess share of voice

The concept that gives share of voice its strategic use is excess share of voice (ESOV): the gap between a brand's share of voice and its market share. The widely cited finding from advertising effectiveness research is that brands whose share of voice exceeds their market share tend to grow, and those whose share of voice sits below it tend to decline.

ESOV = share of voice − market share

A brand with 12% market share and 18% share of voice has an ESOV of +6 points

The relationship is a statistical tendency across many brands, not a guarantee for any single one, and the effect size differs substantially by category. It is a planning heuristic, not a formula that converts spend into growth.

Share of voice versus share of search

  • Share of voice is an input. It reflects what a brand and its competitors put into the market.
  • Share of search is a response. It reflects what people did afterwards.
  • Reading them together is what makes either useful: rising share of voice with flat share of search says the spend is not converting into demand — a finding neither metric produces alone.

Limits worth stating in the report

  • The category set decides the number. Adding or removing one large competitor can move every brand's share by several points.
  • Mentions are not equivalent. Earned and social counts treat a critical mention and a positive one identically unless sentiment is measured separately.
  • Spend is not attention. Paid share of voice measures what was bought, not what was seen or remembered.

Related terms