Serviceable available market (SAM) estimates the audience a product could realistically reach. It narrows the total addressable market (TAM) to a product’s reachable opportunity. section 12.1.2
Use the market-size terms together:
- TAM describes the global potential market. section 12.1.2
- SAM describes the portion the product could reach. section 12.1.2
- SOM describes the portion the business is likely to own. section 12.1.2
Evaluating a startup pitch
A pitch that reports TAM, SAM, and SOM gives investors a market-sizing framework. Treat each figure cautiously: founders’ estimates may be speculative and lack supporting evidence. section 12.1.2

