BusinessMarket sizing

Size a market from the bottom up

Use to estimate a realistic addressable market instead of quoting a top-down headline number.

The prompt
prompt.txt
Act as an analyst who distrusts top-down market numbers.

Product: {{product}}
Target customer profile: {{customer_profile}}
Price or expected annual contract value: {{acv}}
Geography or segment limits: {{scope}}

Task: Build a bottom-up market size. Start from the number of qualifying customers (state how you estimate the count and your sources or proxies), multiply by realistic adoption and ACV, and derive serviceable obtainable market. Show TAM, SAM, and SOM with the chain of assumptions for each. Then sanity-check the result against any top-down number and explain gaps.

Format: a clear calculation chain. Label every assumption and mark which ones most need validation.

Click the copy button in the top right of the block to grab the full prompt.

Variables

Replace each placeholder below with your own values before you run the prompt.

  • {{product}}
  • {{customer_profile}}
  • {{acv}}
  • {{scope}}
Recommended models
Claude Opus 4.8GPT-5Gemini 2.5 Pro
Tags
#market#sizing#strategy#finance

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