Also called: serviceable addressable market · serviceable obtainable market
SAM (serviceable addressable market) is the slice of the total market a company can realistically sell to given its product and go-to-market model; SOM (serviceable obtainable market) is the smaller slice it can capture soon.
SAM and SOM narrow a market-sizing exercise from the theoretical to the realistic. Total addressable market is the whole category, every dollar a product could theoretically capture with no constraints. Serviceable addressable market cuts that down to the slice a specific company can actually sell to, given its product, its geography, its pricing, and the go-to-market model it actually runs. Serviceable obtainable market narrows it once more: the portion of that SAM a company can realistically win in a given stretch of time, once competition, sales capacity, and execution reality get factored in.
Each layer answers a different question. TAM answers 'how big is this category.' SAM answers 'how much of that category can this specific company reach.' SOM answers 'how much of that reachable slice will this company actually win soon, given who else is competing for it and how fast the team can move.' Skipping straight from TAM to a pipeline target is how a company ends up planning against a number sized too large for what its GTM motion can actually execute against.
The three numbers get used differently depending on the audience. TAM does work in a pitch deck, where the story is about ceiling. SAM and SOM do the real work in GTM planning, where the question isn't the ceiling, it's what's actually reachable and winnable with the team and budget in front of you.
SAM is the number worth using to size a target account universe: which accounts, in which geographies, with which tech stack or size profile, actually fit what the product and the sales motion can serve. SOM is the number worth using to set a realistic near-term pipeline target, since it already accounts for how much of that universe is winnable in the stretch a team is actually planning for, not the whole addressable slice.
TAM gets used as if it were a planning number instead of a story number. A target account list sized to TAM instead of SAM ends up full of accounts that don't fit the product's actual reach, geography, or ICP, which is how a GTM team ends up with a long list and thin pipeline coverage at the same time.
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