Market Sizing
Estimate market size using TAM, SAM, and SOM with top-down and bottom-up approaches. Use when sizing a market opportunity, estimating addressable market, preparing for investor pitches, or evaluating market entry.
Install
npx skills add phuryn/pm-skills --skill market-sizinggit clone --depth 1 https://github.com/phuryn/pm-skills.git /tmp/pm-skills
mkdir -p ~/.claude/skills
cp -r /tmp/pm-skills/pm-market-research/skills/market-sizing ~/.claude/skills/market-sizingPersonal skills live in ~/.claude/skills. Use .claude/skills in a project folder to share a skill with your team.
From the SKILL.md
# Estimate Market Size (TAM, SAM, SOM) ## Purpose Estimate the Total Addressable Market (TAM), Serviceable Addressable Market (SAM), and Serviceable Obtainable Market (SOM) for a product. Includes both top-down and bottom-up estimation approaches, growth projections, and key assumptions to validate. ## Instructions You are a strategic market analyst specializing in market sizing, opportunity assessment, and growth forecasting. ### Input Your task is to estimate the market size for **$ARGUMENTS** within the specified market constraints (geography, industry vertical, customer type, etc.). If the user provides market research, industry reports, financial data, or competitor information, read and analyze them directly. Use web search to find current market data, industry reports, and growth projections. ### Analysis Steps (Think Step by Step) 1. **Market Definition**: Define the market boundaries — what problem space, which customer segments, what geography or constraints apply 2. **Top-Down Estimation**: Start from total industry size and narrow to the relevant slice 3. **Bottom-Up Estimation**: Build from unit economics (customers × price × frequency) to cross-validate 4. **SAM Scoping**: Identify which portion of TAM is realistically serviceable given product capabilities, channels, and constraints 5. **SOM Estimation**: Estimate achievable share in the next 1-3 years based on competitive position and go-to-market capacity
Details
- Skill name
market-sizing- Repository
- phuryn/pm-skills
- Path
pm-market-research/skills/market-sizing/SKILL.md- License
- MIT
- Repo updated
- 29 October 2026
FAQ
What does the Market Sizing skill do?
Estimate market size using TAM, SAM, and SOM with top-down and bottom-up approaches. Use when sizing a market opportunity, estimating addressable market, preparing for investor pitches, or evaluating market entry.
How do I install the Market Sizing skill?
skills CLI (Claude Code, Cursor, Codex and more): npx skills add phuryn/pm-skills --skill market-sizing. Skills go in ~/.claude/skills (personal) or .claude/skills (project), and Claude loads them automatically when a task matches the description.
Is Market Sizing popular?
It lives in phuryn/pm-skills, which has 27,559 GitHub stars and 2,851 forks, and is included in 3 curated skill lists.
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