Market Sizing Analysis

Calculates TAM, SAM, and SOM using three methodologies: top-down from industry reports, bottom-up from customer segments, and value theory from willingness to pay. Walks you through the complete framework with formulas, data sources, and validation checks. Use it when building investor decks, validating startup opportunities, or sizing markets for business plans. The bottom-up methodology is most credible with VCs since it builds from actual customer data rather than industry estimates. Includes realistic penetration rates and warns against common red flags like claiming more than 10% market share as a new entrant.

skills.sh installs: 12.2K
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last updated: Aug 21, 2026

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$ npx -y skills add wshobson/agents --skill market-sizing-analysis --agent claude-code

Installs into .claude/skills of the current project.

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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).