Share of Voice Calculator — SOV and Excess Share of Voice

Background.

A challenger brand puts $2,400,000 into measured media in a year when the whole category, itself included, spends $18,000,000. It holds 13.33 % of the category's advertising voice while owning 9.5 % of category sales. Is it spending too much, or exactly what a brand trying to grow should spend?

Share of voice answers the first half: your brand's figure divided by the category total. The Marketing Accountability Standards Board's dictionary describes it as the relative communication presence a brand achieves, most commonly calculated from category media spend, impressions or gross rating points, and extends it to mentions, the brand's share of category discussion.

The second half comes from John Philip Jones, writing in Harvard Business Review in 1990, who argued that a better measure is a brand's market share compared with its share of voice. New brands, he observed, are often investing, speaking more loudly than their market share would justify, while popular brands are often profit taking, keeping their voices low while enjoying a disproportionately large share. The gap between the two is excess share of voice, reported here in percentage points alongside the figure at which voice and market share would be equal.

What is share of voice calculator?

Share of voice is a brand's share of all the communication in its category over a period: its spend, impressions or mentions divided by the category total, times 100. The total includes the brand itself, so every brand's share adds up to 100 %. Excess share of voice is share of voice minus share of market, in percentage points; positive means the brand is louder than its sales position, negative means quieter.

How to use this calculator.

1. 01Choose the basis. Spend counts money committed, impressions count presence delivered, and mentions count earned conversation rather than paid advertising.
2. 02Decide the category boundary first: which brands, which channels, which country, which period. Narrowing any of them raises your share, so write the boundary down.
3. 03Enter your brand's figure and the category total in the same unit, with your own brand inside the total.
4. 04Enter your share of category sales or volume for the same period, or 0 for a brand with no measured share yet.

The formula.

SOV = V ÷ T × 100, where V is your brand's figure and T is the category total including you. ESOV = SOV − SOM, the difference between share of voice and share of market in percentage points. The parity figure, SOM ÷ 100 × T, restates the comparison in the unit you plan in, and the distance from parity is that figure minus yours, negative when you are already ahead.

The basis does not change the arithmetic, only what the share means. A brand that buys media cheaply can hold a larger impressions share than spend share, and a mentions share can move without any advertising at all, so shares on different bases should never be compared with each other.

A worked example.

Frequently asked questions.

References& sources.

1. [1]MASB (Marketing Accountability Standards Board) — Universal Marketing Dictionary, entry "Share of Voice (SOV)". Verbatim: "Share of Voice (SOV) in advertising quantifies the relative communication presence that a specific brand or product achieves. It is most commonly calculated as a percentage of category media spend, impressions, or gross rating points." Formula as published: "Share of Voice (%) = [Impressions of Brand (#) / Total Impressions of all Brands in Category (#)] X 100". The entry also extends the metric to mentions, "the proportion of the category discussion that the brand achieves". Attributed by MASB to the Universal Marketing Dictionary Project, 2026. Free, independent. Retrieved 2026-07-29.
2. [2]Jones, J. P. — "Ad spending: maintaining market share", Harvard Business Review, 68(1), January–February 1990, pp. 38–42. PMID 10106403. The second, independent authority. Abstract verbatim from the free U.S. National Library of Medicine record: "A better measure is a brand's market share compared with its share of voice (the brand's share of the total value of the main media exposure in that product category). New brands are often 'investing' in the market: speaking in a louder voice than their market shares would justify. Popular brands are often 'profit taking'--keeping their voices low but enjoying a disproportionately large market share." The full article is PAYWALLED at hbr.org; the abstract linked here is free and is the text quoted on this page. Retrieved 2026-07-29.
3. [3]Microsoft Advertising API — ShareOfVoiceReportColumn Value Set (Bing Ads v13 reporting service; page updated 2026-01-08). Cited only to document the name collision: Microsoft's "Share of Voice" report measures ImpressionSharePercent, "the estimated percentage of impressions, out of the total available impressions in the market you were targeting" — a within-auction metric, not the category metric calculated on this page. Free, independent. Retrieved 2026-07-29.