Share of Voice:
Calculate It and Use It Well

Share of voice (SOV) measures a brand’s share of a defined competitive total, such as advertising spending or brand mentions. In digital marketing, Sprout Social’s definition also covers social conversation and keyword traffic. Calculating it requires choosing the measure, identifying the competing brands, and comparing equivalent data.

What is share of voice?#

In conventional advertising, share of voice is the percentage of category media spending attributable to a brand. Nielsen’s definition specifies the category, market, channel, and period. It describes the brand’s relative advertising investment; campaign impact requires separate measurement.

Digital SOV uses the same idea of a competitive share, with a different unit. A social mention percentage, an advertising spending percentage, and a search visibility score each describe a particular kind of presence. Name the unit whenever reporting SOV.

How to calculate share of voice#

Cision’s mention-based formula divides brand mentions by total industry mentions and multiplies the result by 100. For a comparable count or spending measure, the calculation is:

Share of voice (%) = Brand’s measured activity ÷ Total measured activity for all included brands × 100

The total includes the focal brand and the selected competitors. Dividing only by competitor activity produces a brand-to-competitor ratio rather than a share of the combined total.

Use one unit throughout the calculation. Divide advertising spending by advertising spending, or mentions by mentions. Keep the dates, market, and source coverage consistent for every brand. Calculate channel shares separately when the available units differ.

Choose the right measure for each channel#

Advertising spending#

Advertising SOV (%) = Brand advertising spend ÷ Total category advertising spend × 100

Use this measure to compare advertising investment across brands. Obtain comparable competitor spending from the same advertising intelligence dataset and specify its coverage. Nielsen’s explanation allows both broad market comparisons and narrower channel or geographic views. Keep those views separately labeled.

Social media mentions#

Social mention SOV (%) = Brand mentions ÷ Mentions of all monitored brands × 100

Sprout Social describes social listening as a way to collect brand and product mentions and compare competitors. Its reporting can also examine engagement, impressions, unique authors, and sentiment. Choose the mention count for a mention-based calculation; keep those additional measures beside it as context.

Earned media and PR#

Media mention SOV (%) = Brand media mentions ÷ Media mentions of all monitored brands × 100

Use the same set of publications or broadcast sources for every brand. Cision’s measurement guide covers manual collection and automated monitoring across media channels. Document whether the unit is an article, a broadcast item, or an individual mention, and how syndicated copies are handled.

Paid search impression share#

Google Ads defines impression share using a campaign’s eligible opportunities:

Impression share (%) = Impressions received ÷ Estimated eligible impressions × 100

Google estimates eligibility using factors including targeting settings, approval status, and quality. Because the denominator is eligible campaign impressions, this figure describes captured advertising opportunities rather than category spending share.

To find it, follow Google’s reporting instructions: open the relevant campaign, ad group, or keyword table, select the columns icon, and add impression share under Competitive metrics. Review Search lost IS (budget) and Search lost IS (rank) to distinguish missed impressions caused by insufficient budget from those caused by Ad Rank.

Organic search visibility#

SEO SOV depends on the tracking tool’s calculation and keyword set. Semrush’s Position Tracking documentation describes a measure weighted by keyword search volumes and estimated traffic. A high-volume keyword therefore contributes more than a low-volume keyword.

Record the tracked keywords and the tool’s scoring method. Keep branded queries and general category queries in separate groups when reviewing performance. Semrush’s traffic figures are estimates based on rankings, so label them as estimates rather than observed visits.

Branded search interest#

Google Trends provides a different measure: relative search interest. Its data documentation explains that searches are sampled, normalized for the selected time and geography, and scaled from 0 to 100. An index value is neither an absolute search count nor a ready-made percentage of category searches.

Also record whether the comparison uses terms or topics. Google’s comparison guide distinguishes entered search wording from topics that group related searches across spellings and languages. Use equivalent selections when comparing brands.

Set up a repeatable measurement#

Before collecting data, record:

• Competitive set: The focal brand, competitors, product names, and aliases included in the calculation.
• Market and period: Geography, language, category, and reporting dates.
• Channel and unit: Advertising spend, social mentions, media items, or a defined search score.
• Coverage and counting rules: Data sources, exclusions, duplicate handling, and treatment of items mentioning multiple brands.

For mention-based reports, apply the same inclusion rules to each brand and check ambiguous name matches. Keep the measurement settings with the report so the next period can use the same method.

For search tracking, annotate keyword changes. Semrush’s documentation explains that adding or removing tracked keywords creates notes in the trend graph. Treat a changed query set as a measurement change when interpreting the trend.

How to interpret changes in share of voice#

The ratio can change through movement in the brand’s activity, competitors’ activity, or the comparison’s coverage. A rise does not require an increase in the brand’s own activity: a smaller competitive total can also raise its share. This follows from the calculation.

Report the brand’s amount, the combined total, and the percentage together. Compare equivalent periods, then examine which channels, keywords, or publications contributed to the movement. Annotate changes to sources or the competitor list before attributing a change to marketing activity.

For mention-based SOV, examine sentiment and coverage quality alongside volume. Cision recommends complementary measures including sentiment and reach because SOV alone does not establish the quality of coverage.

For spending-based SOV, track campaign outcomes separately. Nielsen’s explanation distinguishes advertising resources from campaign impact. Keep sales, conversions, or measured awareness changes alongside the spending share according to the campaign’s objective.

Share of voice, market share, and excess share of voice#

Share of voice concerns measured advertising or conversation. Share of market concerns sales: Sprout Social defines it as a brand’s percentage of total industry sales.

Market share (%) = Brand sales ÷ Total category sales × 100

Align the category and market when comparing advertising SOV with market share. Then calculate excess share of voice:

Excess share of voice (ESOV) = Advertising SOV − Market share

Nielsen’s advertising analysis uses this definition. Express the difference in percentage points. Positive ESOV means the advertising spending share exceeds the sales share; negative ESOV means it is lower.

That analysis discusses a relationship between ESOV and market-share growth, with substantial variation across brands and categories. It identifies brand size, life cycle stage, newness, and campaign quality as contributing factors. Treat ESOV as planning context, with those limitations, rather than converting its historical average into a guaranteed growth forecast.

What is a good share of voice?#

Set a benchmark for the specific measure, competitive set, and objective. Compare it with the previous equivalent period and relevant competitors. For advertising planning, market share supplies an additional reference point through ESOV. For social or media reporting, include sentiment and reach. These comparisons are more informative than choosing an unexplained target percentage.

How to improve share of voice#

Direct the work toward the measure being tracked:

• Advertising: Review the category spending breakdown by market and channel described in Nielsen’s SOV guide before choosing where to adjust investment. Review campaign outcomes alongside the share.
• Paid search: Use the budget and rank diagnostics in Google’s impression share reporting to identify the constraint before changing campaign settings.
• Social: Use conversation topics and sentiment to plan useful content for relevant audiences, following Sprout Social’s content planning guidance. Evaluate subsequent mentions using the same monitoring rules.
• PR: Develop useful content and relationships with relevant media contacts, as Cision recommends. Review the quality and audience relevance of resulting coverage.
• Organic search: Use the keyword and competitor comparisons in Semrush’s tracking report to identify queries and pages for improvement. Keep the tracked set consistent while evaluating changes.