market-sizinglisted

# Market Sizing Calculator Calculate TAM/SAM/SOM using both top-down and bottom-up approaches with clear assumption tracking. ## When to Use This Skill - New product business cases - Expansion into new markets or segments - Investor/board presentations ## What You'll Need - Clear definition of your market boundaries - Industry data or reports (for top-down) - Unit economics inputs (for bottom-up) ## Process ### Step 1: Check Your Context Read context files for company, product, personas, and competitor data. ### Step 2: Define Market Boundaries Define geography, customer segment, and use case boundaries. ### Step 3: Top-Down Analysis Start with total market and narrow down using industry reports and public filings. ### Step 4: Bottom-Up Analysis Build up from unit economics: potential customers x deal size x frequency. ### Step 5: Triangulate Compare approaches. Aligned = high confidence. Divergent = investigate. ### Step 6: Document Assumptions Every number gets a source or explicit assumption marker. ## Framework Reference **TAM-SAM-SOM** with dual methodology: - Top-down: Market reports - narrow to segment - Bottom-up: Unit economics - multiply out - Triangulation increases confidence ## Tips for Best Results 1. Keep context files updated 2. Be conservative - optimistic estimates lose credibility 3. Show your work - transparent assumptions > black box 4. Multiple approaches - if they diverge, you're missing something