TAM/SAM/SOM Builder for AI Ventures

A guided calculator to size your market top-down and bottom-up — TAM, SAM and SOM — with an AI market-expansion multiplier and a sanity check.

Total market size (TAM)$AI expansion multiplier×Serviceable share of TAM%Obtainable share of SAM (3–5 yrs)%Bottom-up: target customersBottom-up: annual contract value$

TAM

$60.0B

Total addressable (AI-expanded)

SAM

$4.8B

Serviceable available

SOM

$240.0M

Serviceable obtainable

Bottom-up sanity check

500 customers × $40k ACV = $20.0M of obtainable revenue. Your bottom-up number is well below the top-down SOM — the top-down share looks optimistic. Investors will test this.

Estimates for planning conversations, not a forecast. Top-down sizing flatters; bottom-up grounds. When the two diverge widely, trust the bottom-up and revisit your assumptions.

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