SAM vs SOM: What's the Difference?

SAM (serviceable addressable market) is the portion of the total addressable market a company can actually target and serve with its current business model and capabilities, without yet accounting for competitors or market barriers.

SOM (serviceable obtainable market) is the smaller slice of SAM a company can realistically capture over a defined period, typically three to five years, once competition, brand awareness, and execution capacity are factored in.

The two sit at successively narrower levels of the same market sizing exercise. SAM answers "how much of this market could we theoretically reach," filtered by what a company's product and go-to-market model are actually capable of serving - a company selling only in English, for instance, has a SAM that excludes non-English-speaking segments of the broader addressable market even though those segments are real demand. SOM answers a harder, more grounded question: of that reachable market, how much can this specific company, with its specific resources, brand recognition, and competitive position, actually win. A large SAM with strong competitors already entrenched in it can still produce a modest SOM, since SAM measures opportunity while SOM measures realistic capture given everyone else already competing for the same buyers. Investors and internal planners tend to weight SOM more heavily than SAM for near-term revenue projections precisely because it's the figure that accounts for competitive reality rather than just theoretical reach, even though SAM remains useful for showing how much room exists to grow into over a longer horizon.