Market Size
Also known as: TAM, SAM, SOM, Addressable Market
H-BMC Block 7 — the volume of potential use cases, expressed as addressable patients, procedures, or episodes.
Full Definition
Market Size in the H-BMC is calculated bottom-up from clinical data rather than top-down from market reports. It expresses the number of patients, procedures, or episodes that could benefit from the solution, segmented by the team's target market and beachhead. Market Size feeds directly into the Revenue Stream calculation. Top-down market sizing ('the global market is $4B') is not a substitute for bottom-up validation.
Example
A surgical planning tool targets laparoscopic cholecystectomy. Bottom-up sizing: 750,000 procedures annually in the US, of which 40% occur in the 200 health systems that are the target market, yielding 300,000 addressable procedures at $X per procedure.