Share of Voice Calculator — SOV and Excess Share of Voice

Background.

Share of voice is your brand's slice of everything said in its category. MASB's Universal Marketing Dictionary defines it as a measure that "quantifies the relative communication presence that a specific brand or product achieves," and notes it is "most commonly calculated as a percentage of category media spend, impressions, or gross rating points." The published formula is one division: brand impressions divided by total impressions of all brands in the category, times 100. This calculator offers MASB's three bases and adds the comparison that makes the number useful.

That comparison comes from John Philip Jones, writing in Harvard Business Review in 1990. His argument was that tying an ad budget to sales — the case-rate system — is the wrong instrument, and that "a better measure is a brand's market share compared with its share of voice." Brands whose voice exceeds their share are, in his words, "investing" in the market; brands whose voice is quieter than their share are "profit taking." The difference between the two is what practitioners now call excess share of voice, and it is the second output on this page.

One caveat governs everything else and it sits beside the answer rather than below it: a share of voice is only as good as the denominator behind it. Draw the category narrowly and your share looks commanding; draw it broadly and the same spending disappears. Two listening tools measuring the same brand will disagree simply because they index different publications. Whenever you publish a share-of-voice figure, publish the category boundary and the source list with it, or the number cannot be checked by anyone including you.

A final note on scope. Widely circulated practitioner research puts a numerical coefficient on the ESOV-to-growth relationship. This page deliberately prints no such forecast, because the underlying databank is not publicly verifiable, and a growth number invented from a secondary summary would be worse than no number at all.

What is share of voice calculator?

Share of voice measures how much of a category's total communication a single brand accounts for. The numerator is your brand's figure and the denominator is the whole category including you, so the shares of all brands sum to 100%. Three bases are in common use and MASB lists all of them. Media spend counts money committed and is Jones's original basis — "the brand's share of the total value of the main media exposure in that product category." Impressions count presence actually delivered, which means a brand that buys efficiently can hold a larger impressions share than spend share. Mentions count the proportion of category discussion the brand achieves, which is an earned-media measure and belongs to social listening rather than to media buying. Excess share of voice is share of voice minus share of market, expressed in percentage points; it is the operational form of Jones's investing-versus-profit-taking distinction. Beware a name collision: Microsoft Advertising files its impression-share metrics under a report called "Share of Voice", where the metric is measured inside one ad auction against the impressions you were eligible for rather than across a category. That is a different thing entirely and has its own calculator.

How to use this calculator.

1. 01Choose the basis. Impressions is the default and matches MASB's published formula; spend matches Jones's original definition; mentions measures conversation rather than advertising.
2. 02Define the category before you enter anything, and write the definition down. Which brands, which channels, which geography, which period — every one of those choices moves the answer.
3. 03Enter your brand's figure and the category total in the same unit. The category total must include your own brand, not just competitors.
4. 04Enter your share of market for the same period, from sales or volume data. Enter 0 if the brand has no measured share yet; the excess-share-of-voice figure is still meaningful.
5. 05Read the excess share of voice, not just the share of voice. A 13% share of voice means one thing for a brand with 9.5% of the market and the opposite for a brand with 20%.
6. 06Use the distance-from-parity output to size the gap in the same unit you budget in — dollars if you chose spend, impressions if you chose impressions.
7. 07Publish the category boundary and the source list alongside any share-of-voice figure you circulate.

The formula.

Share of voice is one division: your figure divided by the category total, times 100. At the worked example's numbers — $2,400,000 of media spend in an $18,000,000 category — that is 13.3333333333%. Excess share of voice subtracts share of market from it: 13.3333333333% − 9.5% = 3.8333333333 percentage points. The parity figure inverts the comparison into the unit you actually budget in: 9.5% of $18,000,000 is $1,710,000, so at $2,400,000 the brand is $690,000 ahead of the spending that would merely match its market share. On rounding stage: every intermediate is carried at full arbitrary-precision decimal width and rounding happens once, at the return boundary, to ten decimal places. Excess share of voice is computed from the unrounded share of voice rather than from the rounded output, which matters here because 2 ÷ 15 repeats forever. One threshold exists and it is tested immediately below, at, and immediately above: excess share of voice of exactly zero is neither investing nor profit taking, and the label says so rather than defaulting into one of the two signed branches. Note what the basis select does and does not do. It changes the label and the interpretation, not the arithmetic — a share is a share whether the units are dollars, impressions or mentions. What changes is what the number means: the same brand can hold a larger impressions share than spend share purely by buying more efficiently than its competitors, and a mentions share can move without any advertising at all.

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.