market-sizing

phuryn/pm-skills · pm-market-research/skills/market-sizing/SKILL.md

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.

No license★ 25853⑂ 2783commit 18468a9

Install skillView source on GitHub

What this skill does

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)

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

Installation

Copy a source-pinned command for your client. You run it yourself.

Destination: .claude/skills/market-sizing · pinned to the source commit

# Run from your project root
git clone https://github.com/phuryn/pm-skills.git .skillboard-tmp
git -C .skillboard-tmp checkout 18468a95b427e70e258b51389796367c6f684e7d
mkdir -p ".claude/skills"
cp -r ".skillboard-tmp/pm-market-research/skills/market-sizing" ".claude/skills/"
rm -rf .skillboard-tmp

Review the source before running. This copies files into your project; it is not a one-click install and does not verify runtime safety.

New here? Step-by-step setup – from installing the agent to using the skill

Operating systemAgentI already use Claude Code

1
Install Git
Install Git with your package manager (Debian/Ubuntu shown; use dnf/pacman on others). Official download.
```
sudo apt update && sudo apt install -y git
```
2
Install Claude Code
Requires Node.js 18+. Install the CLI globally: Official docs. (command-line tool)
```
npm install -g @anthropic-ai/claude-code
```

Get the skill, pinned to its exact version

Open a terminal and run these steps (they clone the source, check out the exact commit, and copy the skill into place):

# Run from your project root
git clone https://github.com/phuryn/pm-skills.git .skillboard-tmp
git -C .skillboard-tmp checkout 18468a95b427e70e258b51389796367c6f684e7d
mkdir -p ".claude/skills"
cp -r ".skillboard-tmp/pm-market-research/skills/market-sizing" ".claude/skills/"
rm -rf .skillboard-tmp

Destination: .claude/skills/market-sizing

4
Use it in Claude Code
Open Claude Code in your project. It reads skills from the folder above, so market-sizing is now available. Always review the source before using it – static checks cannot prove runtime safety.

Security & Audits

Scanner static-checks@0.1.0 · commit 18468a95b427. Static checks cannot prove runtime safety – review the source and the exact diff before installing. How checks work.

No static rules matched. This is not a safety guarantee.

market-sizing

phuryn/pm-skills · pm-market-research/skills/market-sizing/SKILL.md

No license★ 25853⑂ 2783commit 18468a9

Install skillView source on GitHub

What this skill does

Estimate Market Size (TAM, SAM, SOM)

Purpose

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.).

Analysis Steps (Think Step by Step)

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

Installation

Copy a source-pinned command for your client. You run it yourself.

Destination: .claude/skills/market-sizing · pinned to the source commit

# Run from your project root
git clone https://github.com/phuryn/pm-skills.git .skillboard-tmp
git -C .skillboard-tmp checkout 18468a95b427e70e258b51389796367c6f684e7d
mkdir -p ".claude/skills"
cp -r ".skillboard-tmp/pm-market-research/skills/market-sizing" ".claude/skills/"
rm -rf .skillboard-tmp

Review the source before running. This copies files into your project; it is not a one-click install and does not verify runtime safety.

New here? Step-by-step setup – from installing the agent to using the skill

Operating systemAgentI already use Claude Code

1
Install Git
Install Git with your package manager (Debian/Ubuntu shown; use dnf/pacman on others). Official download.
```
sudo apt update && sudo apt install -y git
```
2
Install Claude Code
Requires Node.js 18+. Install the CLI globally: Official docs. (command-line tool)
```
npm install -g @anthropic-ai/claude-code
```

Get the skill, pinned to its exact version

Open a terminal and run these steps (they clone the source, check out the exact commit, and copy the skill into place):

# Run from your project root
git clone https://github.com/phuryn/pm-skills.git .skillboard-tmp
git -C .skillboard-tmp checkout 18468a95b427e70e258b51389796367c6f684e7d
mkdir -p ".claude/skills"
cp -r ".skillboard-tmp/pm-market-research/skills/market-sizing" ".claude/skills/"
rm -rf .skillboard-tmp

Destination: .claude/skills/market-sizing

4
Use it in Claude Code
Open Claude Code in your project. It reads skills from the folder above, so market-sizing is now available. Always review the source before using it – static checks cannot prove runtime safety.

Security & Audits

Scanner static-checks@0.1.0 · commit 18468a95b427. Static checks cannot prove runtime safety – review the source and the exact diff before installing. How checks work.

No static rules matched. This is not a safety guarantee.

market-sizing

What this skill does

Estimate Market Size (TAM, SAM, SOM)

Purpose

Instructions

Input

Analysis Steps (Think Step by Step)

Output Structure

Best Practices

Further Reading

Installation

Install Git

Install Claude Code

Get the skill, pinned to its exact version

Use it in Claude Code

Security & Audits

market-sizing

What this skill does

Estimate Market Size (TAM, SAM, SOM)

Purpose

Instructions

Input

Analysis Steps (Think Step by Step)

Output Structure

Best Practices

Further Reading

Installation

Install Git

Install Claude Code

Get the skill, pinned to its exact version

Use it in Claude Code

Security & Audits