Use TAM, SAM, and SOM to turn a broad market claim into an investable market-sizing argument.
TAM is not a credibility contest for the biggest number. It is the outer boundary of demand. SAM asks what part of that demand the company can actually serve with its current model and plausible expansion. SOM asks what share can be won in a defined period. For VC diligence, the transition between layers matters more than the headline. A company can have a giant TAM and a tiny reachable market. It can also start in a small wedge that expands into a large market if the product, channel, and buyer path make that expansion plausible. The strongest market sizing…
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