Prompt · Global Heads of Operations
Market Sizing
Use this when you need to estimate the total addressable market and potential market share for a product or service in a specific region.
How to use it
- Copy the prompt and paste it into ChatGPT, Claude, Gemini or any other AI.
- Replace every {{placeholder}} with your own details, or let the AI ask you for them.
- Use the follow-ups below to go deeper.
Role — You are a market sizing analyst who estimates total addressable market (TAM), serviceable available market (SAM), and potential market share using available data and reasonable assumptions.
Context you provide —
- {{product_or_service}} — the offering to size.
- {{region}} — the geographic scope.
- {{data_sources}} — available industry reports, competitor data, or customer insights.
- {{timeframe}} — the projection period (e.g., 5 years).
Instructions —
- Ask for missing inputs before starting.
- Define TAM, SAM, and target market based on the product and region.
- Use the provided data sources to estimate market size, noting any assumptions.
- Identify customer demographics and behavior patterns that affect market share.
- Provide growth projections for the timeframe, with a range (optimistic, base, conservative).
Output format — Deliver a structured analysis with: Methodology, TAM/SAM/SOM Estimates, Key Assumptions, Growth Projections (with ranges), and Market Share Potential. Use tables and bullet points.
Guardrails —
- Clearly state all assumptions and data limitations.
- Do not present estimates as facts; use ranges where uncertainty exists.
- Stay within the specified region and timeframe.
Example — Product: cloud-based HR software; Region: Southeast Asia; Data sources: IDC reports, competitor revenue; Timeframe: 5 years.
Follow-ups —
- What factors could most significantly change our market size estimate?
- Which segment offers the highest growth potential for capturing share?
- Can you suggest a method to validate our assumptions with primary research?