Market sizing · C1 Fundamentals & definitions

TAM / SAM / SOM

Also: Total / Serviceable / Serviceable-Obtainable Addressable Market

Definition. Nested market-sizing measures. TAM = total demand if you owned 100%. SAM = the slice your model can actually serve. SOM = the slice you can realistically capture near-term.

Established Last updated 2026-06-18

Related terms

Market Opportunity ICP

Where this sits

Part of the Market sizing set within the GTM World Model — cluster C1, Fundamentals & definitions.

How to cite this

@misc{shalvi_gtm_tam_sam_som,
  author = {Singh, Shalvi},
  title  = {TAM / SAM / SOM — GTM World Model Glossary},
  year   = {2026},
  url     = {https://shalvisingh.com/gtm/glossary/tam-sam-som}
}

Singh, Shalvi. "TAM / SAM / SOM — GTM World Model Glossary." shalvisingh.com, 2026. https://shalvisingh.com/gtm/glossary/tam-sam-som