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.
npx skills add deanpeters/Product-Manager-Skills --skill tam-sam-som-calculator --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
## 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 en
- Purpose
- Input
- Key Concepts
- TAM/SAM/SOM Framework
- Why This Works
- Anti-Patterns (What This Is NOT)
- When to Use This
- When NOT to Use This
- Facilitation Source of Truth
- Application
- Step 0: Gather Context (Before Questions)
- Optional Helper Script (Deterministic Math)
- Mode 3: Autonomous Research (when the user has no numbers)
- Question 1: Problem Space
python3 scripts/market-sizing.py --population 5400000 --arpu 1000 --sam-share 30% --som-share 10%
What does the tam-sam-som-calculator skill do?
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.
How do I install it?
Run `npx skills add deanpeters/Product-Manager-Skills --skill tam-sam-som-calculator --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From deanpeters/Product-Manager-Skills, a repository with 6,255 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.