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# Share of Search: What It Measures, How to Calculate It, and When to Trust It

Share of Search tells you what portion of branded-search demand your brand gets compared to competitors in a certain market and time period. It can show if interest in your brand is rising, but it is not the same as market share and does not prove that marketing caused any changes. To make this metric reliable, always record the brand terms, competitors, location, language, data source, and any changes to your definitions.

The Brandwave team

September 1, 2026

18 min read

## Calculate Share of Search with the definitions visible

Share of Search = your brand's search demand ÷ total search demand for the defined competitor set × 100

The calculation is simple, but setting up the measurement takes more work. Before you begin, clearly define the market, language, time period, data source, brands, and exact search terms you will use. Without these details, you cannot check or compare the percentage accurately.

For example, if your brand terms get 2,000 searches and the total for your brand and four competitors is 10,000 in the same period, your Share of Search is 20%. This means your brand made up one fifth of the branded-search demand in that group. It does not mean you have 20% of sales, awareness, or consideration in the category.

Always show the actual search numbers along with the percentage. Your share can increase if your brand grows, if competitors lose demand faster, or if the whole category gets smaller.

| Input | Write down | Why it changes the result |
| --- | --- | --- |
| Market | Country, region, or global scope | Demand, language, distribution, and competitors differ by market |
| Language | The language used for every brand and market | Translations, transliterations, and mixed-language markets can split demand |
| Period | Monthly or another stable reporting interval | Seasonality and campaign timing make mismatched periods misleading |
| Terms | Every included and excluded brand query | Aliases, products, misspellings, and ambiguous names change the numerator |
| Competitors | The fixed category set and any dated changes | Adding or removing one brand changes every share |
| Source | Google Trends, Search Console, or a named estimate provider | The sources report different units and cannot be combined as if equivalent |

**Key takeaway**

A Share of Search percentage without its market, term set, competitor set, source, and period is not a complete metric.

## Share of Search is not Share of Voice or market share

Share of Search, Share of Voice, and market share all compare your brand to others in a category, but each uses a different measure. Mixing them up removes what makes each one useful.

Share of Search shows that people are actively searching for specific brands. Share of Voice usually measures how much advertising, media coverage, mentions, or impressions a brand gets. Market share is about the brand's share of sales, revenue, units sold, customers, or other business results.

| Metric | Numerator | Useful question | Does not establish |
| --- | --- | --- | --- |
| Share of Search | Search demand for one brand | Is branded-search demand strengthening relative to the chosen competitors? | Awareness, sales, or causation |
| Share of Voice | A brand's advertising, media, mention, or visibility measure | How visible is the brand relative to the category in this channel or dataset? | That the audience noticed, remembered, or preferred the brand |
| Market share | A brand's sales, revenue, units, or customers | What share of the defined commercial market does the brand hold? | Why the share changed |
| Survey awareness | People who recognise or recall the brand in a defined sample | How many eligible buyers know the brand? | Observed search or purchasing behaviour |

Les Binet's research for the IPA showed that Share of Search can be a low-cost way to track and even predict market share. Later studies found a strong link between the two in many categories and countries. This makes Share of Search worth trying, but it does not mean the two measures are the same or that the link will always apply to every brand, category, or market.

Use Share of Search as just one part of your [overall brand measurement](/blog/brand-measurement.md). Check how it matches your own business results before using it to make predictions.

## Build the brand term set before building the chart

Choosing the right search terms is the most important step in the calculation. If your brand name is unique, you may only need one exact search term. If it is a common word, acronym, product family, renamed business, or part of a multi-brand company, list all relevant terms and any exclusions.

Start with the smallest set of terms you can justify. Only add a term if it clearly shows people are searching for your brand in the chosen market, and record when and why you added it. If you add a new product name, do not apply it to past months without noting the definition has changed.

| Term issue | Decision to record | Example risk |
| --- | --- | --- |
| Common-word brand | Use topics, categories, or qualified phrases where the source permits | Searches for the ordinary word inflate apparent brand demand |
| Acronym | Include only where market and context make the brand meaning credible | The acronym belongs to other companies, qualifications, or concepts |
| Product brands | Decide whether the question concerns the parent, the portfolio, or one product | One competitor is measured at company level and another at product level |
| Misspellings | Include stable, meaningful variants only | A typo list creates noise or double-counts provider groupings |
| Rebrand or acquisition | Mark a series break or report old and new names separately during transition | A renamed brand appears to collapse while the successor appears to surge |
| Support and login queries | Decide whether existing-customer demand belongs in the business question | A large installed base looks like stronger future buyer demand |

- Review each term in the target market, not only in your home market.
- Keep category queries out of a branded-search numerator.
- Use the same level of aggregation for your brand and every competitor.
- Keep a change log so a reviewer can see when the definition changed.
- Start a new comparison series when a change prevents a like-for-like history.

## Fix the competitor set to the decision

You choose which brands to include in the comparison, not a tool. Pick the brands that real buyers would actually consider for the decision you are studying. The right set of competitors can change depending on whether you are looking at a broad category, a local sales list, or an investor's market definition.

Do not wait to add a fast-growing brand until it becomes a threat, and do not remove a declining competitor just to improve your numbers. If the competitive landscape changes, keep the old data, note the change, and start a new comparison.

| Decision | Suitable set | Unsuitable set |
| --- | --- | --- |
| Allocate next quarter's category budget | Brands competing for the same buyers in the same market | Every company that appears in a broad industry report |
| Track a regional launch | Available alternatives in that region | Global brands with no local distribution |
| Review one product line | Comparable product or sub-brand terms | A mixture of parent companies, products, and generic categories |
| Assess a rebrand | Old name, new name, and stable competitors with a marked transition | Replacing the old name silently in the historical calculation |

**Key takeaway**

Changing the competitor set changes the denominator. Preserve the previous definition instead of rewriting history.

## Choose a data source that matches the question

There is no single source for Share of Search data. Google Trends, Google Search Console, third-party keyword tools, and other platforms each give a different view. Choose the source that fits your needs, whether you want a free index, data from your own site, estimates across competitors, or a regular managed report.

| Source or tool | What it provides | Best use | Main limitation |
| --- | --- | --- | --- |
| Google Trends | Sampled, normalised, and scaled relative search interest | Free exploration across terms, topics, markets, and time | Not raw search volume; low-volume and ambiguous terms can be difficult to compare |
| Google Search Console | Observed impressions, clicks, CTR, and position for queries where your property appeared | First-party validation of demand reaching your own site | No competitor demand, and query tables omit some anonymised or lower-volume rows |
| Third-party keyword estimates | Modelled absolute search volumes across your brand and competitors | A comparable monthly market and competitor series | Provider methodology, grouping, update cadence, and model changes affect the estimates |
| SearchShare or Branquo | Dedicated Share of Search reporting from a defined brand set | Teams that want a specialist workflow rather than a manual calculation | Verify the source data, term controls, market coverage, history, and definition changes |
| Glimpse | Additional trend and estimated search-volume views around Google Trends | Teams already using Trends that want more context | Check how estimates and browser tooling affect reproducibility |
| Salyence | Share of Search and AI-answer tracking | Teams comparing classic search visibility with assistant visibility | Search demand and AI recommendation presence are different metrics |
| Brandwave | 12 complete months of modelled branded-search demand and competitor Share of Search for a selected market, with optional Search Console observations kept separate | Teams connecting brand demand to activity, costs, outcomes, customer evidence, and decisions | Not a survey panel, social-listening feed, brand-lift experiment, MMM, or causal attribution engine |

Do not combine Google Trends data, Search Console impressions, and estimated search volumes from other providers. Instead, compare the trends and explain any differences, making sure to keep the units and sources clear for each data set.

The [brand tracking tools guide](/blog/brand-tracking-tools.md) compares search evidence with survey panels, social listening, and brand-lift experiments when the decision requires a different method.

## Know when Share of Search is weak evidence

Share of Search works best when buyers actually search for brands in your category, the brand names are easy to tell apart, the competitor set makes sense, and there is enough history to compare with business results. If these conditions are not met, the metric can be weak or misleading.

People might search for a brand for many reasons, such as owners needing support, investors reacting to news, job seekers, students, or even fans of a celebrity with the same name. Search numbers can show demand, but you still need to find out why people are searching.

| Warning sign | Why it weakens the metric | What to do |
| --- | --- | --- |
| Very low search volume | Sampling and provider estimates become unstable or resolve to zero | Use a longer period or another demand and perception method |
| Ambiguous brand names | Non-brand intent contaminates the numerator | Qualify terms, use topics or categories where available, or do not report the metric |
| Large installed customer base | Support, login, replacement, and account searches may dominate | Separate buyer demand where possible and triangulate with survey and commercial evidence |
| Category bought without search | Distribution, habit, procurement, or intermediaries drive choice | Test the historical relationship before using Share of Search as a decision signal |
| Publicity or controversy | Attention increases without positive brand demand | Review news, sentiment, direct customer evidence, and commercial outcomes |
| Changing products or competitor set | The series no longer compares like with like | Mark a break, preserve the old definition, and start a new baseline |
| Market share constrained by availability | Search demand cannot become sales where the product is unavailable | Interpret demand beside distribution, price, capacity, and sales data |

**Key takeaway**

If you do not know why people are searching for the brand, do not use the search trend to predict market share.

## Read absolute demand and relative share together

Relative metrics can rise even if the overall market is shrinking. For example, in a category with three brands, your brand's monthly searches drop from 1,000 to 900, but your competitors' searches fall even more, from 3,000 to 2,100. Your Share of Search goes up from 25% to 30%, even though fewer people searched for your brand.

The right conclusion is not that your brand's demand grew. Instead, your brand lost less demand than the others. This can still matter for budgets or competition, but it is a different insight.

| Measure | Baseline month | Current month | Change |
| --- | --- | --- | --- |
| Your brand demand | 1,000 | 900 | -10% |
| Competitor demand | 3,000 | 2,100 | -30% |
| Total comparison-set demand | 4,000 | 3,000 | -25% |
| Your Share of Search | 25% | 30% | +5 percentage points |

- If absolute demand and share both rise, investigate whether brand demand is strengthening.
- If demand rises but share falls, the category or competitors are growing faster.
- If demand falls but share rises, the brand is declining more slowly than its competitors.
- If both fall, investigate category, product, distribution, reputation, and measurement changes before acting.

## Check confounders before assigning a cause

| Confounder | Question for the review |
| --- | --- |
| Campaign activity | Did paid, earned, creator, event, or partnership activity change during the period? |
| Publicity | Was the brand in the news for reasons unrelated to buyer demand? |
| Seasonality | Is the movement normal for this month, event, weather pattern, or buying cycle? |
| Product and price | Did a launch, discontinuation, promotion, price change, or stock issue alter searches? |
| Distribution | Did availability, territory, retail placement, or sales coverage change? |
| Competitors | Did a competitor launch, rebrand, exit, fail, or receive unusual publicity? |
| Measurement | Did terms, categories, markets, sources, or provider methodology change? |

A chart might show that Share of Search changed after a campaign, but it cannot prove the campaign caused the change. If you need to know what caused the change, run experiments. Also use campaign records, customer feedback, surveys, sales notes, Search Console data, business results, and outside events to help interpret the results.

Write down the best explanation that the evidence supports, along with any other possible reasons. This is more helpful than always trying to link every change to a campaign's success or failure.

## Set a defensible baseline

- Name the business decision, owner, market, language, and review cadence.
- Define the brand terms and exclusions for every entity.
- Choose the competitor set from the buyer decision, not from the chart you want.
- Select one source for the comparable estimate series and record its methodology.
- Backfill enough history to see seasonality and known changes.
- Mark rebrands, launches, acquisitions, distribution changes, and competitor exits.
- Keep absolute search demand next to Share of Search.
- Compare the history with available sales, pipeline, survey, and customer evidence.
- Set a review threshold based on normal variation, not one surprising month.
- Record every definition change and begin a new series where comparability breaks.

A small team can manage this in a spreadsheet if everyone is clear on definitions, responsibilities, and review routines. The workbook below adds a Share of Search definition sheet to the brand-measurement source matrix, making changes to terms and competitors easy to see during monthly reviews.

### Brand measurement source matrix

Use the Share of Search definitions sheet to keep track of markets, languages, brand terms, exclusions, competitor sets, sources, baseline periods, confounders, owners, and any changes to definitions. The workbook also includes the full source matrix and a monthly review section.

[Download template](/blog/brand-measurement-source-matrix.xlsx)

## Run a monthly Share of Search review

| Review step | Question | Output |
| --- | --- | --- |
| Validate | Did terms, competitors, market coverage, source, or methodology change? | Comparable period or documented series break |
| Describe | What changed in absolute demand and relative share? | Bounded factual statement |
| Triangulate | What do Search Console, surveys, HDYHAU, sales, activity, and outcomes show? | Agreement and disagreement map |
| Check context | Which campaign, product, price, distribution, news, competitor, or seasonal events matter? | Confounder record |
| Decide | What will we maintain, test, investigate, increase, reduce, or stop? | Action, owner, due date, confidence, and caveat |

**Key takeaway**

Updating the chart does not finish the review. The review is only complete when the team records the decision, who is responsible, the due date, confidence level, and any limitations.

## Where Brandwave fits

Brandwave provides 12 full months of modelled branded-search demand and competitor Share of Search for a chosen market. Your team sets the brand, exact terms, competitors, market, and language. Optional Google Search Console data such as impressions, clicks, CTR, and position are kept separate from the modelled data.

The full record links demand to campaigns, activities, creators, costs, results, GA4 success metrics, raw and normalised HDYHAU data, promo-code and tagged-link signals, comparisons, briefs, and recommendations. This approved record is available through the web app, HTTP API, and MCP server.

Brandwave does not conduct consumer surveys, gather social listening data from across the web, run brand-lift experiments, build marketing-mix models, or calculate cause and effect. Use a specialist method if your decision needs it. Use Brandwave to keep marketing work, evidence, and investment decisions connected.

### Build the full brand measurement system

Put branded-search demand next to survey, customer, experimental, and commercial evidence without combining them into a single score.

- [Brand measurement: metrics, methods and tools](/blog/brand-measurement.md)

### Choose the right specialist method

Review survey trackers, brand-lift studies, social listening, search data, research tools, and marketing intelligence together to compare their strengths.

- [Best brand tracking tools by measurement method](/blog/brand-tracking-tools.md)

## FAQ

### What is Share of Search?

Share of Search shows what portion of branded-search demand your brand gets within a group of competitors, a market, and a time period. To calculate it, divide your brand's search demand by the total for all brands in the group, then multiply by 100. Always share the terms, competitors, source, market, and period along with the percentage.

### Is Share of Search the same as market share?

No. Share of Search measures how much branded-search demand your brand gets compared to others. Market share measures sales, revenue, units, customers, or other business results. Research has found links between them in some categories, but Share of Search is not the same as market share and should not be used as a guaranteed forecast.

### What is the difference between Share of Search and Share of Voice?

Share of Search looks at branded-search demand. Share of Voice compares a brand's advertising, media coverage, mentions, impressions, or visibility to the total in the category. One measures search behaviour, while the other depends on the channel and data used.

### Can I calculate Share of Search with Google Trends?

Yes, you can use Google Trends for a general comparison if the brands have enough search interest and your terms, topics, market, category, and time settings are well chosen. Google Trends uses sampled, normalised, and scaled data, not raw search numbers. Save your exact setup and do not mix its index with absolute numbers as if they are the same.

### Can Search Console calculate competitor Share of Search?

No. Search Console shows queries and performance for your own verified site in Google Search. It does not show competitor search demand. Use it to check your own site's demand, and keep it separate from the data you use to compare brands.

### How many competitors should a Share of Search report include?

Include the smallest stable group of brands that buyers really compare for the decision, market, and product. There is no set number. Do not mix parent companies with products, global brands with local ones that are not available, or broad categories with sales shortlists. Always record any changes, as they affect the comparison.

### When is Share of Search unreliable?

Share of Search is not reliable when search volume is very low, brand names are unclear, most searches are for customer support, the category is bought without searching, publicity brings attention without real buyer demand, sales are limited by distribution, or when terms and competitors keep changing. Use a different method if you cannot control these issues.

### Does a rise in Share of Search prove a campaign worked?

No. The timing might support a theory, but the change could also be due to competitors, publicity, seasonality, products, prices, distribution, or how you measure things. Use experiments to find causes, and check the trend against campaign records, customer feedback, surveys, Search Console data, and business results.

### What does Brandwave provide for Share of Search?

Brandwave gives you 12 months of modelled branded-search demand and competitor Share of Search for a chosen market, with optional Search Console data such as impressions, clicks, CTR, and position kept separate. It links this data to marketing activity, costs, results, customer feedback, briefs, and decisions. It is not a survey panel, social-listening tool, brand-lift experiment, marketing-mix model, or tool for finding causes.

## Sources

- [IPA: Share of Search](https://ipa.co.uk/knowledge/effectiveness-research-analysis/share-of-search): https://ipa.co.uk/knowledge/effectiveness-research-analysis/share-of-search
- [IPA EffWorks: Share of Search as a Predictive Measure](https://ipa.co.uk/effworks/effworksglobal-2020/share-of-search-as-a-predictive-measure): https://ipa.co.uk/effworks/effworksglobal-2020/share-of-search-as-a-predictive-measure
- [IPA: Cross-industry Share of Search think-tank findings](https://ipa.co.uk/news/share-of-search): https://ipa.co.uk/news/share-of-search
- [Google Trends: FAQ about Google Trends data](https://support.google.com/trends/answer/4365533): https://support.google.com/trends/answer/4365533
- [Google Search Console: Performance report](https://support.google.com/webmasters/answer/7576553): https://support.google.com/webmasters/answer/7576553
- [Google Search Console: Performance dimensions and data groupings](https://support.google.com/webmasters/answer/17011259): https://support.google.com/webmasters/answer/17011259
- [Think with Google: Modern Brand Measurement playbook](https://www.thinkwithgoogle.com/_qs/documents/18398/Modern_Brand_Measurement_Playbook_qBkxQBJ.pdf): https://www.thinkwithgoogle.com/_qs/documents/18398/Modern_Brand_Measurement_Playbook_qBkxQBJ.pdf
- [Kantar: Demystifying Share of Search](https://www.kantar.com/north-america/Inspiration/Analytics/Demystifying-share-of-search): https://www.kantar.com/north-america/Inspiration/Analytics/Demystifying-share-of-search
- [Qualtrics: Understanding Share of Search](https://www.qualtrics.com/blog/share-of-search/): https://www.qualtrics.com/blog/share-of-search/
- [Share of Search Council: What is Share of Search?](https://www.myshareofsearch.com/what-is-share-of-search): https://www.myshareofsearch.com/what-is-share-of-search
- [Share of Search Council: Share of Search is not Google Trends](https://www.myshareofsearch.com/shareofsearch/share-of-search-is-not-google-trends): https://www.myshareofsearch.com/shareofsearch/share-of-search-is-not-google-trends
- [SearchShare: How it works](https://searchshare.io/how-it-works/): https://searchshare.io/how-it-works/
- [Branquo: Share of Search reports](https://branquo.com/): https://branquo.com/
- [Glimpse: Share of Search guide](https://meetglimpse.com/software-guides/share-of-search/): https://meetglimpse.com/software-guides/share-of-search/
- [Salyence: Share of Search and AI brand tracking](https://salyence.com/): https://salyence.com/
- [Brandwave: Brand demand HTTP API reference](https://gobrandwave.com/docs/api-reference/brand-demand): https://gobrandwave.com/docs/api-reference/brand-demand

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## Put brand demand in the wider decision record

Track modelled search demand, competitor Share of Search, Search Console observations, campaign activity, costs, outcomes, and direct customer evidence without hiding where each signal came from.

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