Agent skill · product strategy · deanpeters
tam-sam-som-calculator
Calculate TAM, SAM, and SOM with explicit assumptions, methods, and caveats. Use when sizing a market for a product idea, business case, or executive review.
Why this skill is useful
Provides a structured methodology for calculating TAM, SAM, and SOM with real-world citations and adaptive questioning, which the AI wouldn't reliably generate on its own.
What it needs
About 11k tokens when loaded. Last updated 2026-07-17. 6,302 stars on the source repository.
What this skill does
Purpose Guide product managers through calculating Total Addressable Market (TAM), Serviceable Available Market (SAM), and Serviceable Obtainable Market (SOM) for a product idea by asking adaptive, contextually relevant questions. Use this to build defensible market size estimates backed by real-world citations, economic projections, and population data—essential for pitching to investors, securing budget, or validating product-market fit. This is not a back-of-napkin guess—it's a structured, citation-backed analysis that withstands scrutiny. Input Works best with: The product or idea being sized, and any market constraints you already know (geography, vertical, customer type). Also useful: Pricing assumptions, comparable companies, and the audience for the numbers (investors, execs, business case). Anything supplied with the invocation itself — text after the skill name, a pasted context dump, or an appended ARGUMENTS: line — counts as answers already given. Use it and skip whatever it covers; don't re-ask. Arriving empty-handed? That works too. The calculator opens by asking what you're sizing and for whom, then works through method and assumptions. Three entry modes — pick whichever matches where your evidence lives: 1. Bring your own numbers — you have population and ARPU figures; jump to the math (the helper script makes this deterministic) 2. Guided interview — up to 4 adaptive questions build the inputs with you (the default flow below) 3. Autonomous research — the agent builds a bottom-up, citation-backed estimate from government statistics and filings while you review the evidence (see Mode 3 in Application) Example invocation: Size the market: AI scheduling assistant for independent dental practices, US only, $99/mo price point. — or for research mode: Research-mode market sizing: field-service dispatch software, DACH region; I have no numbers yet. …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills deanpeters/tam-sam-som-calculator