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1 resource from Qubit Capital we point founders to, and the questions each answers.

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This one focuses squarely on the method your short answer champions, building TAM up from real customer counts and pricing rather than slicing a giant number down. It is a good deep dive once you accept that bottom-up is the way and want the mechanics. Practical on ICP counts, adoption assumptions, and unit economics.

Bottom-Up Market Sizing for Startups

From Qubit Capital by Qubit Capital

Build from your ideal customer profile count times annual value
Ground adoption rates and pricing in observable segments
Bottom-up assumptions can be tested, top-down percentages cannot

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Answers What are TAM, SAM, and SOM and how do I actually calculate them? How do I size a market for India specifically when data is messy? Investors keep asking for a top-down TAM slide, but I built my number bottoms-up. Which do I show?

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