market-sizing-analysis
Helps your agent calculate market sizes. It's useful for estimating revenue potential and validating business opportunities.
What it does
This tool helps you understand the size of a market for a new business. It calculates how much money can be earned at different levels: the entire possible market (TAM), the part you can reach (SAM), and the part you can realistically capture in a few years (SOM).
When to use it
- ✓When thinking about starting a new business.
- ✓When trying to get money from investors.
- ✓When planning for a company's future.
Example of what to ask your AI
“I want to know the market size for a meditation app for seniors in Brazil.”
Want more? Open the sections below.
How to use
The easiest way: copy the message below and paste it into Claude, ChatGPT, Cursor or any AI. It reads the skill and follows the instructions.
Skill link
Ready-to-paste message
How it works
The tool uses three methods: it looks at general market reports (top-down), calculates based on the customers you can reach (bottom-up), and estimates how much people would pay for your solution (value theory).
Installation
Easiest way: copy the skill link and paste it into Claude, ChatGPT or Cursor asking it to follow the instructions.
In the terminal (Claude Code, Codex, Cursor), in your project folder:
npx skills add wshobson/agents --skill market-sizing-analysisOr download just the file:
curl -L https://raw.githubusercontent.com/wshobson/agents/main/plugins/startup-business-analyst/skills/market-sizing-analysis/SKILL.md -o SKILL.mdTechnical content (original SKILL.md)
Original text by the author, straight from GitHub.
Market Sizing Analysis
Comprehensive market sizing methodologies for calculating Total Addressable Market (TAM), Serviceable Available Market (SAM), and Serviceable Obtainable Market (SOM) for startup opportunities.
Overview
Market sizing provides the foundation for startup strategy, fundraising, and business planning. Calculate market opportunity using three complementary methodologies: top-down (industry reports), bottom-up (customer segment calculations), and value theory (willingness to pay).
Core Concepts
The Three-Tier Market Framework
TAM (Total Addressable Market)
- Total revenue opportunity if achieving 100% market share
- Defines the universe of potential customers
- Used for long-term vision and market validation
- Example: All email marketing software revenue globally
SAM (Serviceable Available Market)
- Portion of TAM targetable with current product/service
- Accounts for geographic, segment, or capability constraints
- Represents realistic addressable opportunity
- Example: AI-powered email marketing for e-commerce in North America
SOM (Serviceable Obtainable Market)
- Realistic market share achievable in 3-5 years
- Accounts for competition, resources, and market dynamics
- Used for financial projections and fundraising
- Example: 2-5% of SAM based on competitive landscape
When to Use Each Methodology
Top-Down Analysis
- Use when established market research exists
- Best for mature, well-defined markets
- Validates market existence and growth
- Starts with industry reports and narrows down
Bottom-Up Analysis
- Use when targeting specific customer segments
- Best for new or niche markets
- Most credible for investors
- Builds from customer data and pricing
Value Theory
- Use when creating new market categories
- Best for disruptive innovations
- Estimates based on value creation
- Calculates willingness to pay for problem solution
Detailed patterns and worked examples
Detailed pattern documentation lives in references/details.md. Read that file when the navigation tier above is insufficient.
FAQ
What are TAM, SAM, and SOM?
TAM is all the possible money in the market. SAM is the part of that market your product can reach. SOM is the part you can realistically earn in a few years.
Which method should I use?
Use 'top-down' if the market already exists and has reports. Use 'bottom-up' if you know your customers well. Use 'value theory' if you are creating something entirely new.
Why is this important?
It helps you know if a business idea is worthwhile, plan how much money you can make, and convince investors.
Details
Original description by the author
Calculate TAM/SAM/SOM for market opportunities using top-down, bottom-up, and value theory methodologies. Use this skill when sizing markets, estimating addressable revenue, validating market opportunity for a new venture, or building investor-ready market analysis for a startup pitch or business plan.
repo: wshobson/agents
Popularity
- GitHub stars
- 41k
- Ranking position
- #4960
- License
- MIT
- Updated
- 10/15/2026
Comments
- …
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