A nested framework for sizing a market opportunity. TAM is the total market demand for a product category if there were no constraints. SAM is the portion of TAM a specific company could realistically serve given its business model and current offering. SOM is the portion of SAM the company could realistically capture given competition and go-to-market constraints.
Why it matters
These three figures, especially when used together, keep a growth or fundraising narrative honest — a large TAM sounds impressive but says little about a company's actual near-term opportunity, which is better reflected in SAM and SOM.
In a sentence
"Our TAM includes every company that runs marketing campaigns, but our SAM is closer to digital-first teams of 3 to 30 people who are actively fragmented across tools."
Related terms
- Often confused with: Each other — TAM, SAM, and SOM are often used loosely or interchangeably in pitch materials, when precisely they represent progressively narrower, more realistic slices of the same market.
- Synonyms: Market sizing (as a general category encompassing all three terms).