Calculate TAM/SAM/SOM for market opportunities

Market sizing analysis

by wshobson · MIT license · ★ 39,857 on GitHub · v1.0.0 · updated Sep 21

Calculate TAM/SAM/SOM for market opportunities using top-down, bottom-up, and value theory methodologies. Use this skill when sizing markets, estimating addressable revenue, validating market opportunity for a new venture, or building…

---
name: market-sizing-analysis
description: Calculate TAM/SAM/SOM for market opportunities using top-down, bottom-up, and value theory methodologies. Use this skill when sizing markets, estimating addressable revenue, validating market opportunity for a new venture, or building investor-ready market analysis for a startup pitch or business plan.
version: 1.0.0
---

# Market Sizing Analysis

Comprehensive market sizing methodologies for calculating Total Addressable Market (TAM), Serviceable Available Market (SAM), and Serviceable Obtainable Market (SOM) for startup opportunities.

## Overview

Market sizing provides the foundation for startup strategy, fundraising, and business planning. Calculate market opportunity using three complementary methodologies: top-down (industry reports), bottom-up (customer segment calculations), and value theory (willingness to pay).

## Core Concepts

### The Three-Tier Market Framework

Overview

Comprehensive market sizing methodologies for calculating Total Addressable Market (TAM), Serviceable Available Market (SAM), and Serviceable Obtainable Market (SOM) for startup opportunities.

Manual install (npx, ZIP)

Claude Codenpx skills add wshobson/agents --skill market-sizing-analysis -g -a claude-code

Claude Code (manual)

mkdir -p ~/.claude/skills && curl -sL https://codeload.github.com/wshobson/agents/tar.gz/4236bb91f839 \
  | tar -xz -C ~/.claude/skills --strip-components=4 agents-4236bb91f839/plugins/startup-business-analyst/skills/market-sizing-analysis

Windows (PowerShell)

New-Item -ItemType Directory -Force "$HOME\.claude\skills" | Out-Null; Invoke-WebRequest "https://m.agentalley.io/zip/38a98ff38522d922ea4b/market-sizing-analysis.zip" -OutFile "$env:TEMP\market-sizing-analysis.zip"; Expand-Archive "$env:TEMP\market-sizing-analysis.zip" -DestinationPath "$HOME\.claude\skills" -Force

Claude.ai / desktopDownload the ZIP and upload it under Settings → Capabilities → Skills.

Codex, Cursor, other agentsPoint them at SKILL.md. The other files are plain text.

Connects with Agent Alley MCP · agentalley.io/mcp

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SKILL.md2.4 KB
examples/1 file · 10.5 KB
references/2 files · 17.8 KB

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Market Sizing Analysis

Comprehensive market sizing methodologies for calculating Total Addressable Market (TAM), Serviceable Available Market (SAM), and Serviceable Obtainable Market (SOM) for startup opportunities.

Overview

Market sizing provides the foundation for startup strategy, fundraising, and business planning. Calculate market opportunity using three complementary methodologies: top-down (industry reports), bottom-up (customer segment calculations), and value theory (willingness to pay).

Core Concepts

The Three-Tier Market Framework

TAM (Total Addressable Market)

Total revenue opportunity if achieving 100% market share
Defines the universe of potential customers
Used for long-term vision and market validation
Example: All email marketing software revenue globally

SAM (Serviceable Available Market)

Portion of TAM targetable with current product/service
Accounts for geographic, segment, or capability constraints
Represents realistic addressable opportunity
Example: AI-powered email marketing for e-commerce in North America

SOM (Serviceable Obtainable Market)

Realistic market share achievable in 3-5 years
Accounts for competition, resources, and market dynamics
Used for financial projections and fundraising
Example: 2-5% of SAM based on competitive landscape

When to Use Each Methodology

Top-Down Analysis

Use when established market research exists
Best for mature, well-defined markets
Validates market existence and growth
Starts with industry reports and narrows down

Bottom-Up Analysis

Use when targeting specific customer segments
Best for new or niche markets
Most credible for investors
Builds from customer data and pricing

Value Theory

Use when creating new market categories
Best for disruptive innovations
Estimates based on value creation
Calculates willingness to pay for problem solution

Detailed patterns and worked examples

Detailed pattern documentation lives in references/details.md. Read that file when the navigation tier above is insufficient.

1	---
2	name: market-sizing-analysis
3	description: Calculate TAM/SAM/SOM for market opportunities using top-down, bottom-up, and value theory methodologies. Use this skill when sizing markets, estimating addressable revenue, validating market opportunity for a new venture, or building investor-ready market analysis for a startup pitch or business plan.
4	version: 1.0.0
5	---
6
7	# Market Sizing Analysis
8
9	Comprehensive market sizing methodologies for calculating Total Addressable Market (TAM), Serviceable Available Market (SAM), and Serviceable Obtainable Market (SOM) for startup opportunities.
10
11	## Overview
12
13	Market sizing provides the foundation for startup strategy, fundraising, and business planning. Calculate market opportunity using three complementary methodologies: top-down (industry reports), bottom-up (customer segment calculations), and value theory (willingness to pay).
14
15	## Core Concepts
16
17	### The Three-Tier Market Framework
18
19	TAM (Total Addressable Market)
20
21	- Total revenue opportunity if achieving 100% market share
22	- Defines the universe of potential customers
23	- Used for long-term vision and market validation
24	- Example: All email marketing software revenue globally
25
26	SAM (Serviceable Available Market)
27
28	- Portion of TAM targetable with current product/service
29	- Accounts for geographic, segment, or capability constraints
30	- Represents realistic addressable opportunity
31	- Example: AI-powered email marketing for e-commerce in North America
32
33	SOM (Serviceable Obtainable Market)
34
35	- Realistic market share achievable in 3-5 years
36	- Accounts for competition, resources, and market dynamics
37	- Used for financial projections and fundraising
38	- Example: 2-5% of SAM based on competitive landscape
39
40	### When to Use Each Methodology
41
42	Top-Down Analysis
43
44	- Use when established market research exists
45	- Best for mature, well-defined markets
46	- Validates market existence and growth
47	- Starts with industry reports and narrows down
48
49	Bottom-Up Analysis
50
51	- Use when targeting specific customer segments
52	- Best for new or niche markets
53	- Most credible for investors
54	- Builds from customer data and pricing
55
56	Value Theory
57
58	- Use when creating new market categories
59	- Best for disruptive innovations
60	- Estimates based on value creation
61	- Calculates willingness to pay for problem solution
62
63	## Detailed patterns and worked examples
64
65	Detailed pattern documentation lives in `references/details.md`. Read that file when the navigation tier above is insufficient.
66
67