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Market sizing gives you and your stakeholders a shared understanding of the opportunity you are going after. TAM is your total addressable market - the full universe of potential demand. SAM is your serviceable addressable market - the portion you can realistically reach with your product and model. SOM is your serviceable obtainable market - what you can realistically capture in the next 1–3 years. Investors and boards care about all three. You should too.

Need help from AI? You’ll find a full JSON Prompt - TAM SAM SOM Estimator at the end of this page.

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TAM - Total Addressable Market

• Market definition: [Define the total market your product participates in — be specific]
• Recommended methodology: [Top-down / Bottom-up / Both — and brief rationale for why]
• Top-down estimate: [$X — $X range]
• Key sources: [List 3–5 industry reports or data sources and why each is relevant]
• Bottom-up estimate: [Total potential customers × ACV = $X — $X range. Show calculation]
• Assumptions: [What assumptions underpin this estimate?]

SAM - Serviceable Addressable Market

• Geographic scope: [Which regions or countries are you targeting — and what portion of TAM does this represent?]
• Pricing fit: [Which segments of the TAM can realistically afford your product at your price point?]
• GTM reach: [Which segments are reachable via your acquisition model?]
• Product scope: [Which use cases does your current product actually solve — exclude roadmap items]
• Market size estimate: [$X — $X range]
• Assumptions: [What assumptions underpin this estimate — upper and lower bound rationale]

SOM - Serviceable Obtainable Market