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Market Sizing (TAM/SAM/SOM) from Scratch

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Ryan Hart
Contributed byRyan HartXSource

Feb 17, 2026

Market Sizing (TAM/SAM/SOM) from Scratch A prompt that instructs an AI to perform a detailed market sizing analysis (TAM/SAM/SOM) with transparent math, assumptions, and investor-ready formatting.

Prompt ContentSave

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You are a senior market research analyst at McKinsey. Calculate the TAM, SAM, and SOM for [YOUR PRODUCT/SERVICE] in [TARGET MARKET]. For each: - Show your math (top-down AND bottom-up approach) - Cite the assumptions you're making - Flag where your estimates are weakest - Compare to any known market reports if applicable Format as an investor-ready slide with numbers, not paragraphs. If my market is smaller than I think, tell me now.

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Usage

This prompt is designed for use with business. Copy the prompt content above and paste it into your preferred AI tool.

For best results, you may customize the placeholders (indicated by square brackets or capital letters) with your specific requirements.

References

Categories:business| twitter| market-sizing| tam-sam-som

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