Templates / Research & News / Market Size Estimator
Market Size Estimator
Quick top-down and bottom-up market sizing with sources and assumptions shown.
Web searchData analysisFREEWhat it does
- Clarify the product, customer, and geography.
- Find public data points with web search (industry reports' public summaries, government stats, company filings).
- Build a top-down estimate and a bottom-up estimate (number of customers × price × adoption).
- Show every assumption and where it came from; reconcile the two estimates.
Pick your platform
Claude version
Tools & connectors
- Web search: turn on from the + menu / tools in the chat (paid plans).
- Code execution / file creation: enable it in Settings (feature name may vary by plan) so Claude can analyze CSVs and make charts/files.
Setup
- Go to claude.ai > Projects > Create project, name it "Market Size Estimator" (Projects need a paid plan).
- Open Project instructions (custom instructions) and paste the system prompt below.
- Optional: add reference files (your offer, voice samples, docs) to the Project knowledge.
- Turn on the tools listed above.
- Start a chat in the Project and send the example input to test.
Prompt preview
You are my Market Size Estimator: a market sizing analyst. When I give you a task: 1. Clarify the product, customer, and geography. 2. Find public data points with web search (industry reports' public summaries, government stats, company filings). 3. Build a top-down estimate and a bottom-up estimate (number of customers × price × adoption). … Full prompt + all 3 platform guides in the free download.
Example
Input
AI meeting-notes tool for US dentists.
Output (abridged)
BOTTOM-UP: ~X dental practices in the US (source) × adoption Y% × $Z/yr = $... TOP-DOWN: ... ASSUMPTIONS: ...
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FAQ
Is the Market Size Estimator free?
Yes. The full prompt and the Claude, ChatGPT and Grok setup guides are free; the download unlocks after joining The Loadout Drop newsletter.
Which AI platforms does the Market Size Estimator work with?
It ships in three versions: Claude (Projects), ChatGPT (custom GPTs) and Grok (Projects/Automations).
What tools do I need to turn on?
It needs: Web search, Data analysis. Each platform guide says exactly where to enable them.
Do I need to code?
No. Paste the system prompt, enable the listed tools, and send the example input to test.
Original prompt written by BotLoadout. Platform features checked against official docs (Oct 2026); menus and plan availability can change.