Serviceable addressable market is the portion of total addressable market that a company can realistically reach and serve today. It excludes customers the product does not suit, regions it does not sell in and segments its go-to-market cannot reach. Serviceable obtainable market narrows it further to the share the company could win in a defined period given competition and capacity.
From TAM to SAM to SOM
Each step applies a filter. TAM asks how big the whole opportunity is. SAM asks how much of it the company could serve with what it has. SOM asks how much of that it could plausibly win soon.
- TAM: all companies that could ever use this type of product.
- SAM: those in supported regions, languages, sizes and industries, reachable by the current motion.
- SOM: the share of SAM the company expects to win in a set period, given competition and resources.
Why SAM is the more useful number
Planning decisions such as hiring, channel investment and content priorities depend on who the company can serve now. A large TAM is encouraging but does not tell a team where to focus. A clear SAM does: it defines the segments to target, the languages to publish in and the integrations to support.
SAM changes as the product does. Adding a language, an integration or an enterprise feature can expand it, and that expansion is often a better reason for a new content program than a general goal to grow traffic.
SAM and content scope
A content strategy aimed at SAM avoids publishing for markets the company cannot serve. If the product only supports customers in certain countries, ranking globally for a broad term may bring traffic that can never convert. Matching content scope to SAM keeps acquisition effort on reachable buyers.
Example
Expanding SAM with a new language
Hypothetical company Dunmore Labs sells scheduling software in English only. Its SAM excludes non-English-speaking markets. When it launches a German interface and support, its SAM grows to include German-speaking companies in its target segment, and only then does it start a German-language content program.
Common mistakes
Treating SOM as a target without a plan
SOM should follow from channel capacity and conversion assumptions, not from a desired percentage of the market.
Questions
Precise enough to guide decisions. Clear assumptions matter more than exact figures, because the inputs are uncertain.
