Library/Leadership, Coaching & People Management/Strategy, Planning & GTM Leadership/Calculate TAM, SAM, and SOM for Market Planning
TestedLeadership, Coaching & People ManagementSame-Day Use (under 30 min)

Calculate TAM, SAM, and SOM for Market Planning

Size your total, serviceable, and obtainable market with calculation methodology and planning implications.

About this prompt

This prompt helps sales managers, sales directors, and founder-led sellers calculate TAM, SAM, and SOM for their product using their ICP criteria, price point, and target geography. It produces each market size figure with the calculation methodology behind it and planning implications. Use it during annual sales planning or fundraising preparation when you need a defensible market sizing. Works for both top-down and bottoms-up approaches.Market sizing credibility depends on methodology, not just the number — this prompt shows the math, not just the result. Input what you sell and at what ACV, your ICP criteria (who buys), and your geographic and industry scope. The output covers TAM (total if everyone who could buy did), SAM (realistic given your current go-to-market capabilities), and SOM (what you can actually capture given competition and resources), each with the calculation approach used so you can defend the numbers. Use this during annual planning cycles or fundraising prep; for competitive analysis, a separate market research prompt is more appropriate. For founder-led sellers sizing their first market, the SOM calculation is the most practically useful — it grounds ambitious revenue targets in something defensible. For best output, provide your actual ACV and a specific ICP rather than a broad description of your market.

The prompt

Know how big your opportunity is. Calculate TAM, SAM, and SOM for planning. Tell me about your market. I'll help you size the opportunity. YOUR PRODUCT: ● What you sell: [PRODUCT] ● Price point: [ANNU
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Variables to replace

PRODUCT | ACV | ICP | REGIONS | VERTICALS | EMPLOYEE OR REVENUE RANGE

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 Manager, Sales Director, Founder-Led Seller
DifficultyIntermediate
Time to valueSame-Day Use (under 30 min)
Works withAI-Agnostic
CategoryLeadership, Coaching & People Management
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