Market sizing worksheet

TAM / SAM / SOM with assumptions and sources.

TAM (Total Addressable Market)

Total demand if you captured 100% of the market. Usually top-down (e.g. industry reports) or bottom-up (units × price across all segments).

Amount (e.g. $B)

Source / assumption

Segment of TAM you can realistically serve (e.g. geography, vertical, product type).

Amount

Segment definition

Share you can capture in 3–5 years (realistic first revenue target). Often bottom-up: # customers × ARPU.

Amount

Assumption (e.g. 10 pilots × $50K)

Narrowest first market: who pays first, and why you win there.

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