Full Definition
The Total Addressable Market (TAM) represents the total revenue opportunity available for a product or service, assuming the company could capture 100% of the market. It's a critical metric used in pitch decks and investor evaluations to demonstrate market opportunity size.
TAM, SAM, and SOM
- TAM (Total Addressable Market): The entire market demand for your product or service
- SAM (Serviceable Addressable Market): The segment of TAM you can realistically reach with your business model
- SOM (Serviceable Obtainable Market): The portion of SAM you can realistically capture in the near term
Calculating TAM
- Top-down: Start with industry research and narrow down (e.g., "$50B global CRM market, 10% is SMB segment = $5B TAM")
- Bottom-up: Calculate from your unit economics up (e.g., "50M potential customers × $100/year = $5B TAM")
- Value theory: Estimate the value your product creates and what portion you can capture
Real-World Example
A B2B cybersecurity startup calculates: TAM = $200B (global cybersecurity), SAM = $30B (cloud security), SOM = $500M (SMB cloud security in North America).
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Related Terms
A visual presentation used by founders to pitch their startup to potential investors.
The stage where a product satisfies strong market demand, indicated by rapid organic growth.
The strategy a company uses to generate income from its product or service.
The first major institutional venture capital funding round, typically following seed funding.
The direct revenues and costs associated with a single unit of a business model (typically per customer).
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