What Is Share of Voice (SOV)?
Share of Voice (SOV) is the percentage of total category advertising or attention your brand owns in a given window. In paid media it is usually measured as your impressions divided by all category impressions in an auction. In organic search it is your visibility (rank-weighted impressions across tracked keywords) divided by the category total. It is the closest paid-media analogue to market share.
Formula
The 'category' definition is everything, keyword set for SEO SOV, ad-auction set for Google Ads Auction Insights, or a competitive set of brands for share-of-search style calculations. Change the category definition and the SOV number changes; report the definition alongside the number every time.
Worked example
A Bangladesh fintech tracks its share of voice on 40 branded and non-branded keywords through Google Ads Auction Insights. Their impression share sits at 22 percent; the two biggest competitors hold 34 and 19 percent. Over the next quarter the fintech lifts SOV to 31 percent by adding budget on high-converting non-brand terms. Twelve weeks later their branded-search volume is up 28 percent, a lagged signal that the extra SOV translated into real category demand.
Benchmarks
- SOV to market share (Byron Sharp / Les Binet & Peter Field): sustained SOV above market share (Excess Share of Voice, ESOV) predicts long-run market-share growth at roughly 0.5 point per 10 points of ESOV per year.
- Healthy Google Ads impression share for a category leader: 60 to 80 percent on core commercial terms.
- Healthy impression share for a challenger: 20 to 40 percent, focused on the terms where you can actually convert.
- SEO SOV on a tracked keyword set: 15 to 25 percent for a strong mid-market brand; 40 percent+ for a category leader.
Les Binet and Peter Field's IPA analysis of ~500 campaigns shows brands whose SOV exceeds their market share grow, on average, 0.5 percentage points of market share per year for every 10 points of excess SOV.
Why it matters
SOV is the leading indicator that separates brands that grow from brands that harvest. Two accounts with the same ROAS but different SOV trajectories end the year in very different places: the one gaining SOV compounds; the one losing SOV harvests until the pipeline dries up. Report SOV alongside CPA and ROAS so budget conversations include the growth side, not only the efficiency side.
Common mistakes
- 1.Measuring SOV against an over-narrow keyword or competitor set; you can be 'the leader' in a category small enough not to matter.
- 2.Reading SOV as a real-time optimisation metric; it is a quarterly and annual signal, not a weekly one.
- 3.Chasing SOV by buying cheap, irrelevant impressions; unqualified reach inflates the number without moving demand.
- 4.Ignoring the ESOV framework, matching your SOV to your market share only holds position; growing requires spending above your share.
Put Share of Voice to work
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FAQs about Share of Voice
How do I measure share of voice on Google Ads?
Use Auction Insights inside Google Ads. It shows your impression share and the impression share of the competitors bidding on the same keywords, which is the cleanest paid-media SOV proxy available.
How is share of voice different from share of search?
Share of voice measures paid or total attention (impressions). Share of search measures branded-search volume from Google Trends as a proxy for share of consumer intent. Share of search is a strong leading indicator of market share and is free to compute.
What is ESOV?
Excess Share of Voice, your SOV minus your market share. Positive ESOV predicts future market-share gains; negative ESOV predicts future losses. It is the metric that ties short-term media spend to long-term growth.
Can a small brand ever compete on SOV?
Yes, by narrowing the category. A small brand can dominate SOV on a specific product line, region, or keyword cluster while ceding the wider category. That focused SOV still drives category-relevant demand.
How often should I review SOV?
Monthly at the account-management level, quarterly at the strategy level, and annually as part of budget planning. Weekly SOV movements are usually noise.
Related terms
Number of times your ad was rendered on a screen.
Number of unique users who saw your ad at least once.
Average number of times a person saw your ad in a window.
Cost to serve 1,000 impressions, the auction's price signal.
Controlled test measuring incremental awareness or recall from ads.
Spend across awareness, consideration and conversion in one coherent plan.