market-sizing-analysis

Calculate TAM, SAM, and SOM using top-down, bottom-up, and value-theory methods.

Updated Apr 5, 2026
One-click install
npx skills add https://github.com/Jhabbig/Habbig --skill market-sizing-analysis-jhabbig
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: market-sizing-analysis
Source: https://github.com/Jhabbig/Habbig/tree/main/.claude/plugins/wshobson/startup-business-analyst/skills/market-sizing-analysis
Command: npx skills add https://github.com/Jhabbig/Habbig --skill market-sizing-analysis-jhabbig

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill helps founders, analysts, and operators estimate the size of a market opportunity without relying on vague or inflated claims. It turns an idea into a defensible TAM, SAM, and SOM narrative that is suitable for planning, fundraising, and strategic decision-making.

Core Features & Use Cases

  • Three sizing methods: Applies top-down, bottom-up, and value-theory approaches to build a more credible market estimate.
  • Investor-ready structure: Organizes assumptions, data sources, filters, and validation steps so the final analysis is easy to present.
  • Validation and triangulation: Compares multiple methods, checks segment logic, and flags unrealistic assumptions before the numbers are used.
  • Use cases: Startup pitches, business plans, new product launches, category expansion decisions, and market opportunity reviews.

Quick Start

Estimate TAM, SAM, and SOM for my startup idea using the best available data and a bottom-up approach, then validate the result with top-down and value-theory checks.

Frequently Asked Questions about market-sizing-analysis

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I calculate TAM, SAM, and SOM for my startup pitch?

Calculate TAM, SAM, and SOM by applying top-down, bottom-up, and value-theory methods to build a defensible market sizing narrative. This approach uses source triangulation and assumption validation to ensure your market opportunity estimates are credible and investor-ready.

What is the best way to validate market sizing assumptions for a business plan?

Validating market sizing assumptions requires comparing top-down, bottom-up, and value-theory calculations against each other. This triangulation process checks segment logic and flags unrealistic estimates before the final TAM, SAM, and SOM numbers are used for strategic planning.

How do I estimate market opportunity for an emerging or niche market?

Estimating market opportunity for niche and emerging markets requires segment filtering and bottom-up analysis to project realistic SOM. This method bypasses vague industry reports by triangulating available data sources to establish a defensible market size.

When do I need bottom-up analysis versus top-down market sizing?

Bottom-up analysis is needed when building credible SOM and SAM estimates for specific product launches, while top-down sizing sets the overall TAM boundary. Applying both methods alongside value-theory checks validates the market opportunity across established and emerging segments.

Can I use investor research data to build a startup market size estimate?

Investor research data can be directly used to build a startup market size estimate by feeding it into bottom-up and value-theory calculations. The process organizes assumptions, data sources, and segment filters to produce an investor-ready TAM, SAM, and SOM narrative.

What are the limitations of using top-down market sizing for venture analysis?

Top-down market sizing limitations include inflated TAM figures and poor segment logic for niche or emerging ventures. To mitigate this, bottom-up calculations and value-theory checks must be applied to triangulate data and flag unrealistic assumptions before investor presentation.