Growth Metrics

Total Addressable Market (TAM)

The total revenue opportunity available if a product captured 100% of its target market.

TAM defines the theoretical ceiling of a market opportunity. It answers: if every possible customer bought your product, what would total annual revenue be? TAM is commonly calculated top-down (using industry research and market reports) or bottom-up (counting every potential buyer and multiplying by expected ACV). TAM is most useful for understanding whether a market is large enough to build a venture-scale business or whether it caps out at a micro-SaaS opportunity. It is also frequently misused — overstated TAM in pitch decks is a cliché that sophisticated investors discount immediately. TAM should be qualified by how much of the market is realistically accessible given geographic, regulatory, and competitive constraints. That accessible slice is the serviceable addressable market.