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Market Sizing Analysis

Estimate TAM, SAM and SOM market sizes for a startup idea using three methods

Source Download skill
Repository
wshobson/agents
Stars
42,095
Licence
MIT
Files
4 files

What it does

This skill teaches an AI agent a structured way to estimate how big a market opportunity is. It explains three sizing approaches (top-down from industry reports, bottom-up from customer segments and pricing, and value theory based on willingness to pay) and the three-tier framework: TAM (total possible revenue), SAM (the part your product can serve) and SOM (the realistic share you could win in 3-5 years). Once installed, the agent can walk you through these calculations and produce investor-style market analysis for a business plan or pitch.

Great for

  • Founders preparing a pitch deck or business plan who need a clear market size estimate
  • Students or analysts learning the TAM/SAM/SOM framework
  • Anyone validating whether a new venture's market is large enough to be worth pursuing

Skip it if

  • Replacing real market research: the skill provides a method, and the figures it produces depend on the inputs you supply, so unverified assumptions can produce misleadingly precise numbers that should not be relied on for major financial decisions
  • Regulated or high-stakes financial reporting where audited sources are required

Try asking

  • “Size the TAM, SAM and SOM for a B2B invoicing tool for small businesses in Europe”
  • “Estimate addressable revenue for a new AI note-taking app using a bottom-up calculation from customer segments”
  • “Help me build an investor-ready market analysis section for my startup business plan”
  • “Compare top-down and bottom-up market estimates for a niche pet-food subscription service”
Step-by-step guide: how to use Market Sizing AnalysisInstall, first run, examples, tips and FAQs

Install in 3 steps

  1. 1

    Download the skill

    The ZIP contains the 4 original files, the MIT licence and an attribution note.

    market-sizing-analysis.zip
  2. 2

    Add it to your agent

    Claude Code (all projects)

    mkdir -p ~/.claude/skills && unzip market-sizing-analysis.zip -d ~/.claude/skills/

    Claude Code / Agent SDK (this project only)

    mkdir -p .claude/skills && unzip market-sizing-analysis.zip -d .claude/skills/

    Claude apps (web/desktop): Settings → Capabilities → Skills → Upload skill, and choose the ZIP.

  3. 3

    Ask for the task

    No special command needed — the agent reads the skill's description and loads it when your request matches. Try one of the prompts above.

Get better results

  • Provide your own pricing, customer counts and region details so the bottom-up math reflects your business rather than generic assumptions
  • Check every industry figure the agent cites against its original source before using it in a pitch, since the skill's data-source guidance is only a starting point
  • Ask the agent to show each formula and assumption so you can challenge and adjust them

What's inside

  • examples/saas-market-sizing.md
  • references/data-sources.md
  • references/details.md
  • SKILL.md

Redistributed unmodified from wshobson/agents under the MIT licence. The assessment was drafted with AI from the skill's files on 2026-10-29. Skills can instruct your agent to run code — read SKILL.md and any scripts before installing.