Tam Sam Som Calculator
Calculate TAM, SAM, and SOM with explicit assumptions, methods, and caveats.
Install
npx skills add deanpeters/Product-Manager-Skills --skill tam-sam-som-calculator -g -a claude-code -y- Repository
- deanpeters/Product-Manager-Skills7.8k
- Category
- Business
- Updated
- 20d ago
- License
- See repository
- Context cost
- Mediumabout 3,000 tokens
- Runs scripts
- Yes, review before use
What it does
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.
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:
- Bring your own numbers, you have population and ARPU figures; jump to the math (the helper script makes this deterministic)
- Guided interview, up to 4 adaptive questions build the inputs with you (the default flow below)
- 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.
