AI Prompt for Market Sizing Analysis
Size any market using bottom-up logic that investors and executives actually trust — with every assumption explicit and testable.
What it does
Builds a bottom-up market size estimate that’s actually defensible. Top-down sizing (“the global CRM market is $80B, we’ll capture 1%”) is useless for decisions. This prompt builds from specific, countable customer segments with explicit assumptions at every step — so you can see exactly where the estimate is strong and where it’s a guess.
Example output
A 3–4 line excerpt of what this prompt produces.
Segment 2: Mid-market SaaS companies (50–500 employees) 14,200 companies in DACH region (Statista 2025). 38% have a dedicated RevOps function (assumption — source: Pavilion survey, ±8%). Of those, 72% currently use spreadsheet-based forecasting (assumption — extrapolated from 23 user interviews). Willingness to pay: CHF 890/month (median from pricing survey, n=41). Segment TAM: CHF 34.8M/yr. Confidence: Medium — the 72% spreadsheet figure carries the most uncertainty; if actual rate is 50%, segment drops to CHF 24.2M.
Prompt structure
The sections this prompt guides the model through.
- 1. Define the Customer Universe
- 2. Qualification Funnel
- 3. Revenue Calculation
- 4. TAM / SAM / SOM
- 5. Assumptions Log
- 6. Sensitivity Analysis
- 7. Sanity Checks
Opening lines
The first lines of the prompt itself.
Size the following market using bottom-up analysis.…
One rule from the prompt
A single rule — the full prompt contains more.
Every percentage is an assumption — label it as such. An honest "these numbers don't reconcile, here's why" is more valuable than forced alignment.
Unlock the full prompt
Part of the Strategic Analysis Pack — 7 prompts for CHF 19.
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