Library/Account Research & Buyer Intelligence/Industry & Vertical Context/Build a Rigorous TAM/SAM/SOM Market Sizing Model
TestedAccount Research & Buyer IntelligenceSame-Day Use (under 30 min)

Build a Rigorous TAM/SAM/SOM Market Sizing Model

Produce a multi-methodology market sizing model with 5-year outlook, segment attractiveness, and GTM implications.

About this prompt

This prompt generates a comprehensive TAM, SAM, and SOM market sizing model using both top-down and bottom-up methodologies, with transparent assumptions, external benchmark comparisons, a 5-year growth outlook, and segment attractiveness assessment. It is for sales directors, sales managers, and RevOps professionals who need market intelligence rigorous enough to inform GTM planning and defend in front of investors or leadership. Use it when building a new territory strategy, entering a new market, or preparing for an annual planning cycle.Use this prompt when you need a market sizing model that holds up to scrutiny — one with explicit assumptions, stated uncertainty ranges, and external validation rather than a single number pulled from a report. Fill in the industry, product description, ICP, geography, business model, average contract value, and sales motion. The output follows a structured methodology: top-down from broader market to relevant segment, bottom-up from target account universe times realistic ACV, and a reconciled TAM/SAM/SOM table with sensitivity analysis. It also includes a 5-year CAGR forecast, major growth and risk drivers, and three external benchmark comparisons. The strategic implications section translates findings into GTM focus, segment prioritization, and ICP refinement guidance. For best results, provide whatever market data you already have — even rough estimates — so the AI can benchmark against them rather than building from scratch. Ask it to flag the top two uncertainty drivers that most affect your SOM estimate.

The prompt

You are a senior market intelligence strategist with expertise in B2B market sizing, segmentation, and go-to-market modeling. Your task is to build a rigorous TAM, SAM, and SOM analysis for the follow
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Variables to replace

YOUR INDUSTRY / PRODUCT CATEGORY|DESCRIBE PRODUCT|DESCRIBE ICP|GEOGRAPHY|SAAS / SERVICES / USAGE-BASED / LICENSE / HYBRID|ACV / PRICE IF KNOWN|SALES-LED / PLG / CHANNEL / HYBRID

How to run it

  1. Copy the prompt and paste it into Claude, ChatGPT, Gemini, or Copilot — it's tuned to run in any of them.
  2. Replace the variables — swap each bracketed token for your deal's specifics. The variables list above explains every field.
  3. Make it yours — run it, keep what's strong, and tighten your inputs on the next pass. The prompt improves with your context.

What good output looks like

Make it yours

StagePre-Prospecting
SeatSales Director, Sales Manager, RevOps / Sales Ops
DifficultyAdvanced
Time to valueSame-Day Use (under 30 min)
Works withAI-Agnostic
CategoryAccount Research & Buyer Intelligence
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