TAM SAM SOM Calculator

Bottom-up market size calculation — the methodology investors actually respect. AI provides the framework, you supply the inputs. Every assumption labeled, every number traceable.

Free, no signup required. Results in 2-5 minutes.

Bottom-Up Beats Top-Down

"It's a $50B market" tells investors nothing. "There are 400K target customers who'd pay $29/month" tells them everything. This tool walks you through the credible approach.

Market Size vs. Build Cost

A $10M TAM means nothing if your MVP costs $500K. This calculator bridges market opportunity to development investment — so you know if the math works before you write a line of code.

Honest About Estimates

Every AI-generated number is labeled as an estimate with a suggested verification source. You'll know exactly what's validated data vs. what needs independent confirmation.

How It Works

Describe Your Product and Pricing

Tell us what you're building, who pays, and how you charge. We'll help you benchmark if you're not sure on pricing.

Define Your Target Market

Narrow down geography and customer segments. The more specific, the more credible the output.

Calculate TAM, SAM, SOM

Walk through the bottom-up math step by step. Every assumption documented, every formula shown.

Get the Build-Cost Bridge

See how your market opportunity compares to estimated development cost. Breakeven customers, payback period, and whether the investment makes sense.

FAQ

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.

"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.

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.

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 the build cost?

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.

8 Free Discovery Tools

Each tool works standalone or as part of a guided journey. Start anywhere — context carries forward automatically.

Business Model Canvas Competitive Analysis Market Sizing User Personas Feature Prioritization Tech Strategy Project Requirements Build Cost & Plan

Built & Maintained by Varstatt

Varstatt is a one-person product studio run by Jurij Tokarski, product engineer since 2011. These tools are free and open — no signup, no catch.