Free market size calculator
TAM, SAM & SOM Calculator
Estimate annual TAM, SAM, and a SOM scenario from your own customer-count, annual-amount, and reach assumptions. Foundable does not supply or verify market data.
Start broad, then narrow the same annual scenario.
TAM equals potential customers multiplied by the annual amount per customer. SAM applies the serviceable-share assumption to TAM. SOM applies both the serviceable and obtainable shares to the original TAM factors.
This is a unit-based annual estimate. Match the amount to the unit you counted, such as account-level amounts with account counts or seat-level amounts with seat counts. For a marketplace, use your business's annual sales or take unless the result is explicitly labeled as GMV.
Browser-local market sizing
Use one annual basis and your own assumptions.
Estimate annual market opportunity from your own customer-count, annual-amount, and reach assumptions. Foundable does not supply or verify market data.
Calculated result
Enter valid inputs to calculate the scenario.
Results stay in this page until you reset, edit an input, or leave. The calculator does not fetch, save, or send input values.
Keep one unit, one annual basis, and visible assumptions.
Money is calculated in whole cents. Percentages support four decimal places, and halfway cents round up. SOM is calculated from the original exact factors instead of the displayed, rounded SAM value.
Define one market unit
Choose one specific offer and count unique potential customers using a dated source. Keep the annual amount aligned with that count.
Calculate annual TAM and SAM
Multiply potential customers by the annual amount per customer, then apply the serviceable share for the current offer, model, geography, and eligibility constraints.
Frame SOM as a scenario
Apply the obtainable share to the same exact factors, then document the evidence and planning period behind that assumption before sharing it.
One annual scenario, shown step by step.
Illustrative inputs only: 100,000 potential customers at $1,200 per customer each year produce a $120,000,000 TAM. A 25% serviceable share produces a $30,000,000 SAM.
A 4% obtainable share of that SAM produces a $1,200,000 SOM scenario. The example demonstrates the arithmetic; it does not validate demand, forecast sales, or establish a suitable market share.
Make the evidence as visible as the arithmetic.
Foundable does not capture or verify sources. Add these details to the downloaded report before using the estimate in a plan or presentation.
Customer-count and annual-amount sources have dates.
Record where the customer count and annual customer amount came from and when each source was current.
The customer unit and annual amount match.
Match the amount to the unit you counted, such as account-level amounts with account counts or seat-level amounts with seat counts, and keep one annual basis throughout.
The SOM share has evidence and a planning period.
State what time horizon, competition, awareness, budget, sales capacity, and delivery limits support the obtainable-share assumption.
A market-size scenario is not measured demand.
TAM is the hypothetical annual sales opportunity if every potential customer in the stated market paid the entered annual amount. SAM is the portion left after the serviceable-share assumption. The SOM scenario is the portion left after both assumptions; it is not a sales forecast.
The model assumes a uniform annual amount per customer and omits demand validation, competition response, adoption timing, churn, discounts, seasonality, capacity, acquisition cost, profit, growth, and valuation.
Answers to common TAM, SAM, and SOM questions.
How do I calculate TAM, SAM, and SOM?
Enter your potential-customer count and annual amount per customer, then narrow the result by the serviceable share and assumed obtainable share. Foundable's calculator estimates annual TAM, annual SAM, and a SOM scenario. Its results are arithmetic from user inputs, not verified market data, measured demand, a sales forecast, company valuation, or financial advice.
What do TAM, SAM, and SOM mean?
TAM is the hypothetical annual sales opportunity if every potential customer in the stated market paid the entered annual amount. SAM is the portion remaining after the serviceable-share assumption. The SOM scenario is the portion remaining after both share assumptions; it is not a sales forecast.
Does this calculator validate the market assumptions?
No. Foundable supplies no market data and does not verify demand, customer counts, prices, reach, or obtainable share. The result is arithmetic from user inputs and needs dated sources, exclusions, and a stated SOM planning period before it is shared.
Replace assumptions with evidence.
Research one buyer, offer, geography, annual amount per customer, source set, exclusion list, and SOM planning period. Keep the calculator output labeled as an unverified scenario.