Skip to main content
affpapa.org
RU EN
skill Claude Code CX Codex Cursor GitHub Copilot

market-sizing — Claude Code skill: estimate TAM, SAM, SOM

Skill for calculating market size using TAM, SAM, and SOM with top-down and bottom-up approaches. Helps validate market opportunity and prepare investor pitches.

Install into Claude Code · Skills CLI (Vercel) All methods and platforms ↓ 
npx skills add phuryn/pm-skills --skill market-sizing -a claude-code
Open on GitHub

What market-sizing does

market-sizing automates strategic market analysis: it calculates TAM (Total Addressable Market) by working top-down from industry reports, then validates using bottom-up unit economics (customer count × price × frequency). It narrows to SAM (Serviceable Addressable Market)—the realistic portion your product can reach given geography, language, channels, and product limits. Finally, it estimates SOM (Serviceable Obtainable Market)—achievable share in 1–3 years based on competitive position and go-to-market capacity.

The skill outputs a summary table with current and projected figures, maps key assumptions with confidence levels, and flags what could change the estimates. It searches current market data, analyst reports, and benchmarks—never invents numbers, always cites sources.

What it helps with

  • estimate market size for investor pitch
  • calculate TAM, SAM, and SOM with reasoning
  • evaluate feasibility of market entry into new segment or region
  • forecast market growth over the next 2–3 years
  • identify and validate critical assumptions behind estimates

Example prompts for the agent

  • Estimate the size of B2B CRM market in Europe for the last 3 years
  • Calculate TAM, SAM, and SOM for a project management SaaS in APAC
  • What's the market size for fitness mobile apps in North America? Include 2-year growth projection

How to install market-sizing

1Skills CLI (Vercel)

npx skills add phuryn/pm-skills --skill market-sizing -a claude-code

2Manually: put the files in place

~/.claude/skills/market-sizing/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/market-sizing/

From the same set61

The whole set →
create-prd phuryn This skill builds a lean PRD from an 8-section template. Use it to define a feature, document product requirements, or review an existing PRD. Claude Code CX Codex Cursor +1 10,800installs pre-mortem phuryn Runs a pre-mortem risk assessment on PRDs and launch plans. Catches critical launch blockers, surfaces hidden team assumptions, and maps action items. Claude Code CX Codex Cursor +1 10,200installs outcome-roadmap phuryn Rewrites feature-heavy roadmaps into outcome-focused statements tied to business and customer impact. Helps teams replace rigid feature lists with measurable strategic goals. Claude Code CX Codex Cursor +1 9,900installs prioritization-frameworks phuryn Reference guide to 9 prioritization frameworks: RICE, ICE, Opportunity Score, Kano, MoSCoW and more. Helps you pick the right method, compare approaches, and rank tasks by importance. Claude Code CX Codex Cursor +1 9,900installs strategy-red-team phuryn Stress-tests PRDs, roadmaps, and strategies by attacking load-bearing assumptions before reality does, returning kill criteria and cheap tests. Claude Code CX Codex Cursor +1 9,200installs competitor-analysis phuryn This skill researches direct competitors and compares their positioning, strengths, weaknesses, and pricing. Use it to prepare a competitive brief or find ways to differentiate a product. Claude Code CX Codex Cursor +1 3,800installs business-model phuryn Skill generates a Business Model Canvas with all 9 building blocks: from key partners and activities to channels and revenue streams. Use it to create a business model, document how value flows, or analyze an existing business. Claude Code CX Codex Cursor +1 3,700installs privacy-policy phuryn Skill drafts a detailed privacy policy accounting for GDPR, CCPA, and other regulations. Use it when building a new product, updating data protection docs, or preparing for compliance audits. Claude Code CX Codex Cursor +1 3,500installs

Similar

acestep calesthio Generates music and vocal tracks from prompts, transfers audio style, and extracts stems. Use it for background tracks, jingles, and video audio work. Claude Code CX Codex Cursor +1 1,000installs heygen calesthio Skill for generating AI avatar videos, explainers, and presentations through the HeyGen API or MCP tools directly from agent chats. Claude Code CX Codex Cursor +1 1,000installs gtm-product-led-growth official Smit Patel (https://linkedin.com/in/smitkpatel) This skill helps choose between PLG and sales-led growth, review activation, and map channel economics. Use it for developer tools and B2B SaaS with self-serve potential. GitHub Copilot 1,800installs marketing-ideas coreyhaines31 This skill suggests marketing ideas for SaaS and software products based on their stage and available resources. Use it when you need a place to start with growth. Claude Code CX Codex Cursor +1 146,400installs revops coreyhaines31 This skill helps design RevOps workflows for lead stages, scoring, routing, and marketing-to-sales handoffs. Use it when CRM processes need clear rules. Claude Code CX Codex Cursor +1 113,000installs product-marketing coreyhaines31 Creates and maintains a shared document for product positioning, audience, and brand voice. Use it before other marketing skills so they can refer to the same context. Claude Code CX Codex Cursor +1 83,700installs brag latent-spaces Generates a short, polished launch video from project source code using Hyperframes. Requires no running server or screenshots. Claude Code CX Codex Cursor +1 20,000installs baoyu-post-to-weibo JimLiu Prepares regular Weibo posts and articles through Chrome. Use it when text, media, or a Markdown article needs to be placed in the editor for manual publishing. Claude Code CX Codex Cursor +1 21,600installs

Questions about market-sizing

How do I install market-sizing in Claude Code?

Run npx skills add phuryn/pm-skills --skill market-sizing -a claude-code in your terminal, then find the skill file at ~/.claude/skills/market-sizing/SKILL.md. For other platforms: Codex uses npx skills add phuryn/pm-skills --skill market-sizing -a codex, Cursor uses npx skills add phuryn/pm-skills --skill market-sizing -a cursor, GitHub Copilot uses gh skill install phuryn/pm-skills market-sizing.

What does market-sizing do?

It automates market sizing: computes TAM using both top-down (industry reports) and bottom-up (unit economics) methods, defines SAM based on product reach and constraints, estimates SOM as a realistic share for 1–3 years, and surfaces key assumptions with confidence ratings.

Do I need specific data to use this skill?

The skill searches for market data automatically—analyst reports, industry benchmarks, financial statements. You can also upload your own sources: research reports, competitor analysis, internal data. The skill reads and incorporates them into calculations.

Source text

SKILL.md · MIT 
---
name: market-sizing
description: "Estimate market size using TAM, SAM, and SOM with top-down and bottom-up approaches. Use when sizing a market opportunity, estimating addressable market, preparing for investor pitches, or evaluating market entry."
---

# Estimate Market Size (TAM, SAM, SOM)

## Purpose
Estimate the Total Addressable Market (TAM), Serviceable Addressable Market (SAM), and Serviceable Obtainable Market (SOM) for a product. Includes both top-down and bottom-up estimation approaches, growth projections, and key assumptions to validate.

## Instructions

You are a strategic market analyst specializing in market sizing, opportunity assessment, and growth forecasting.

### Input
Your task is to estimate the market size for **$ARGUMENTS** within the specified market constraints (geography, industry vertical, customer type, etc.).

If the user provides market research, industry reports, financial data, or competitor information, read and analyze them directly. Use web search to find current market data, industry reports, and growth projections.

### Analysis Steps (Think Step by Step)

1. **Market Definition**: Define the market boundaries — what problem space, which customer segments, what geography or constraints apply
2. **Top-Down Estimation**: Start from total industry size and narrow to the relevant slice
3. **Bottom-Up Estimation**: Build from unit economics (customers × price × frequency) to cross-validate
4. **SAM Scoping**: Identify which portion of TAM is realistically serviceable given product capabilities, channels, and constraints
5. **SOM Estimation**: Estimate achievable share in the next 1-3 years based on competitive position and go-to-market capacity
6. **Growth Projection**: Forecast how TAM, SAM, and SOM may evolve over the next 2-3 years
7. **Assumption Mapping**: Surface the key assumptions underlying each estimate

### Output Structure

**Market Definition**
- Problem space and customer need
- Geographic and segment boundaries
- Key constraints or scoping decisions

**TAM (Total Addressable Market)**
- Top-down estimate with sources and reasoning
- Bottom-up estimate for cross-validation
- Reconciliation of the two approaches
- Current TAM value (annual revenue opportunity)

**SAM (Serviceable Addressable Market)**
- Which portion of TAM the product can realistically serve
- Constraints: geography, language, channels, product capabilities, pricing tier
- SAM as percentage of TAM with reasoning

**SOM (Serviceable Obtainable Market)**
- Realistic share achievable in 1-3 years
- Basis: competitive position, go-to-market capacity, current traction
- SOM as percentage of SAM with reasoning

**Market Summary Table**

| Metric | Current Estimate | 2-3 Year Projection |
|--------|-----------------|---------------------|
| TAM    |                 |                     |
| SAM    |                 |                     |
| SOM    |                 |                     |

**Growth Drivers & Trends**
- Key factors that could expand or contract the market
- Technology, regulatory, demographic, or behavioral shifts
- Emerging segments or adjacent markets

**Key Assumptions & Risks**
- Critical assumptions behind each estimate (numbered)
- Confidence level for each (high / medium / low)
- How to validate the most uncertain assumptions
- What would materially change the estimates

## Best Practices

- Always provide both top-down and bottom-up estimates to triangulate
- Use web search for current industry data, analyst reports, and market benchmarks
- Cite sources for market data — avoid unsupported numbers
- Be explicit about assumptions; label estimates vs. data
- Distinguish between value-based (revenue) and volume-based (users/units) sizing
- Consider currency and purchasing power parity for international markets
- Flag where estimates have wide confidence intervals
- Recommend specific data sources or research to sharpen estimates

---

### Further Reading

- [Market Research: Advanced Techniques](https://www.productcompass.pm/p/market-research-advanced-techniques)
- [User Interviews: The Ultimate Guide to Research Interviews](https://www.productcompass.pm/p/interviewing-customers-the-ultimate)
- [Crossing the Chasm: The Ultimate Guide For PMs](https://www.productcompass.pm/p/crossing-the-chasm)
- [Product Innovation Masterclass](https://www.productcompass.pm/p/product-innovation-masterclass) (video course)

© phuryn · MIT · phuryn/pm-skills

See also

Project sponsors

Companies that keep this analytics open
Gold sponsor
Nutra.Club

Impressions, clicks and code copies — open statistics. We keep the numbers public for the same reason NeBlask itself is public. Become a sponsor