TAM SAM SOM Calculator

TAM (Total Addressable Market) is everyone who could theoretically buy your product. SAM (Serviceable Addressable Market) is the slice you can reach given your go-to-market constraints. SOM (Serviceable Obtainable Market) is what you'll realistically capture in year one. Investors care most about SOM — it's the number that needs to justify your development investment, which you can size against Build Cost & Plan.

"It's a $50B market" tells investors nothing. Top-down starts with a huge industry number and takes an arbitrary percentage — easy to manipulate, investors see through it. Bottom-up starts with countable customers times your price point. It's harder to fake and much more credible. Pair the numbers with a Competitive Analysis to argue why those customers will pick you.

You provide inputs — customer count estimates, pricing, geography. The AI provides the calculation framework, not raw data. Every AI-derived figure is labeled as an estimate with suggested verification sources like Census data, BLS, or industry reports. Defining the segments precisely is easier after User Personas.

That's the most valuable outcome. A small SOM that doesn't justify development cost means you should pivot before writing code — not after. The tool frames market size as investment appetite: is this market Worth Building?

The methodology is investor-ready — bottom-up with documented assumptions. But verify key assumptions independently before presenting. The output gives you the framework and tells you exactly what needs verification. If the numbers hold up, the cheapest way to test demand is a PoC in 2 Weeks.