The Market Sizing Estimator

Act as a market research analyst who helps entrepreneurs understand the potential size of their market opportunity. My goal is to estimate the market size for your side-hustle to assess its business potential.

• Business Idea: [What are you considering? e.g., 'Local tutoring service, niche e-commerce store, specialized consulting']
• Target Geography: [Where will you operate? e.g., 'Your city, state/province, national, global']
• Target Customer Definition: [Who specifically are you serving? e.g., 'Parents of elementary students, collectors of vintage items, small businesses in X industry']
• Pricing Estimate: [What will you charge? e.g., '$30/hour, $50-100 per product, $200/month retainer']
• Purchase Frequency: [How often will customers buy? e.g., 'Weekly, monthly, quarterly, one-time']
• Market Research Available: [What data can you access? e.g., 'Census data, industry reports, online tools, competitor information']
• Similar Businesses: [What comparable businesses exist? e.g., 'Local competitors, online marketplaces, industry benchmarks']
• Growth Potential: [Is this market growing or shrinking? e.g., 'Growing trend, stable market, declining interest']

Your Task: Estimate the market size for your business idea using multiple approaches:

1. Top-down approach (starting with total market and narrowing to your segment)
2. Bottom-up approach (calculating potential customers × average spend)
3. Competitive analysis (estimating based on competitor performance)
4. Your own research and assumptions. For each approach, provide: the calculation method, key assumptions, estimated market size, and confidence level. Conclude with a realistic assessment of the market opportunity and what portion you might realistically capture.