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tam-sizing

Estimate TAM, SAM, and SOM with top-down and bottom-up models.

70|34|Updated Apr 7, 2026
Search Tags:#market-sizing#market-research#sam#bottom-up#top-down#som#tam
One-click install
npx skills add https://github.com/Productfculty-aipm/PM-Copilot-by-Product-Faculty --skill tam-sizing-productfculty-aipm
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: tam-sizing
Source: https://github.com/Productfculty-aipm/PM-Copilot-by-Product-Faculty/tree/main/skills/tam-sizing
Command: npx skills add https://github.com/Productfculty-aipm/PM-Copilot-by-Product-Faculty --skill tam-sizing-productfculty-aipm

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill helps product teams and founders produce a defensible, investor-ready market size using the TAM/SAM/SOM framework and a bottom-up sanity check so estimates are grounded and credible.

Core Features & Use Cases

  • Structured Framework: Guides users through definitions of TAM, SAM, and SOM and when to use each metric.
  • Top-down and Bottom-up Models: Combines analyst data, competitor benchmarks, and customer counts with a bottom-up revenue build to validate assumptions.
  • Investor vs Internal Outputs: Produces outputs tailored for pitch decks (top-down framing) and internal planning (bottom-up SOM with assumptions and confidence levels).
  • Use Case: Create a market-sizing slide and supporting appendix for a seed pitch, including sources, methodology, and a one-data-point request to improve defensibility.

Quick Start

Use the tam-sizing skill to produce TAM, SAM, and SOM estimates with methodology, a bottom-up sanity check, and a confidence assessment for my product profile.

Frequently Asked Questions about tam-sizing

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I calculate TAM, SAM, and SOM for a pitch deck?▼

Estimate market size by combining top-down analyst data with bottom-up customer counts and revenue builds. This validates assumptions and produces a defensible market model with documented sources and confidence levels.

What is the difference between top-down and bottom-up market sizing?▼

Top-down sizing uses analyst data and competitor benchmarks to frame the market, while bottom-up sizing builds revenue from customer counts. Combining both validates assumptions and produces a defensible market model.

How do I make my TAM estimate defensible for investors?▼

Make your TAM defensible by documenting assumptions, sources, and confidence levels alongside your estimates. Applying a bottom-up sanity check to top-down research ensures your market sizing is grounded and credible for investors.

Can I use this market sizing framework for internal product planning?▼

Yes, you can use this framework for internal planning by focusing on the bottom-up SOM output. It provides detailed assumptions and confidence levels tailored for internal forecasting rather than just investor presentations.

What data do I need to estimate SOM for a specific geography?▼

To estimate SOM for a specific geography, you need customer counts, segment definitions, and applicable revenue models. These inputs drive the bottom-up revenue build used to validate your top-down market research.

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