TAM, SAM, SOM — What Each Number Actually Means
The total global revenue opportunity if your product captured 100% of the market. Used to establish category scale.
The portion of TAM your product and business model can realistically address given geography, segment fit, and channel.
The share of SAM you can realistically capture in 3–5 years given competitive dynamics, team, and go-to-market.
The formula is simple; the inputs are where a market size goes wrong: a single unsourced industry figure, a rounded number, or a source nobody re-checked. The worked example below shows the alternative — every input named, sourced, and multiplied in the open.
Worked Example: Sizing Dental-Practice Software From Census Data
The counts come from the Census Bureau's Statistics of U.S. Businesses (SUSB), which provides annual statistics for U.S. business establishments with paid employees (U.S. Census Bureau, About SUSB). In the 2022 table "U.S. & states, 6-digit NAICS", Offices of Dentists (NAICS 621210) had 120,488 firms operating 136,140 establishments, with receipts of $160,195,607 thousand; firms with fewer than 20 employees operated 115,477 of those establishments (U.S. Census Bureau, 2022 SUSB Annual Data Tables by Establishment Industry).
A U.S.-only TAM: every dental-office establishment with paid employees in 2022, at the assumed price.
Only offices run by firms with fewer than 20 employees, used here as the proxy for independent practices.
The assumed three-year share of SAM, or about 2,310 practice locations.
TAM as a share of 2022 receipts for all offices of dentists ($160,195,607 thousand).
The same table shows why the SAM cut matters. Firms with 500 or more employees — 138 of them — operated 7,899 dental offices, about 57 locations each. One sale to a large group can cover dozens of sites, so that segment is better sized by firm than by location.
The cross-check is the easiest step to skip. A TAM equal to 0.25% of the industry's receipts is a small share of practice revenue for one software category; a result implying that practices spend several percent of revenue on a single tool should send you back to the price assumption. You can rerun this arithmetic with your own count and price using the free calculators on our tools page.
How the Research Pipeline Approaches Market Sizing
VIDANALYTICA INC's AI-powered research handles a sizing brief in four stages:
Scopes the research brief — defines market boundaries, geographic scope, and customer segments before any search begins.
Gathers and screens the sources for each brief: industry research databases, government statistical releases, SEC filings, news, and proprietary reports.
Checks a sample of key claims against their cited sources before delivery. Flags discrepancies. Runs both top-down and bottom-up sizing where possible.
Structures the output — a clear, cited document with methodology transparency, source list, and executive summary formatted for investor review.
Depending on the market: economic data from FRED (which republishes many BLS and Census series) and the World Bank; company filings from SEC EDGAR; and academic research from OpenAlex, Semantic Scholar and arXiv. The $15 and $29 briefs, Focused Analysis and larger reports gather fresh sources for each order; Starter reports draw on our existing research library.
What to Ask For in a Full Market Sizing Report
A Focused Analysis is scoped to your brief. For a market-sizing order, these are the elements worth naming when you order:
Common Questions
What is TAM SAM SOM analysis?
TAM is the total global market opportunity. SAM is the portion your business model can realistically reach. SOM is the share you can capture given your competitive position and go-to-market. Together they define the size and realism of your market opportunity.
How accurate is AI-powered market sizing?
It depends on the data behind it. A sizing figure is only as reliable as its inputs, so the useful test is whether each input can be traced to a named source. In a VIDANALYTICA INC report, sources are cited inline and a sample of key claims is fact-checked before delivery, so you and your investors can check the figures against their sources.
How much does a TAM SAM SOM report cost?
A full TAM, SAM, and SOM analysis is a Professional Focused Analysis: $999, delivered in 7–10 days, with deeper segmentation. A $99 Starter brief, delivered in 48–72 hours, answers one focused market-sizing question. We sign NDAs upon request.
Key Takeaways
- ✓ TAM, SAM, and SOM are the three layers of market sizing used by investors and strategists
- ✓ A bottom-up TAM is a named count times a stated price: 136,140 dental offices × an assumed $3,000 = $408.4M
- ✓ Cross-check the result against a top-down figure, such as the industry's total receipts
- ✓ Sources cited inline; a sample of key claims fact-checked before delivery
- ✓ Full TAM, SAM, and SOM analysis from $999 in 7–10 days; Starter briefs on one focused sizing question from $99 in 48–72 hours
Commission a Market Sizing Report
Tell us your market, geography, and customer segment. We deliver TAM, SAM, and SOM as a Professional Focused Analysis from $999 in 7–10 days, with sources cited inline and a sample of key claims fact-checked before delivery. For one focused sizing question, Starter briefs start at $99 in 48–72 hours.