Market Sizing — TAM/SAM/SOM Calculator

Build defensible market sizing for any product, pitch deck, or business case. Top-down and bottom-up methodologies combined.

3,891 stars

byopenclaw

Complexity: easy

View on GitHub Installation ↓

About this skill

This AI agent skill is designed to generate comprehensive and defensible market sizing for various business contexts, including pitch decks, business cases, and strategic planning. It systematically calculates the Total Addressable Market (TAM), Serviceable Addressable Market (SAM), and Serviceable Obtainable Market (SOM) by employing a robust combination of top-down and bottom-up methodologies. Users simply provide their product/service and target customer, and the agent will synthesize relevant data from government sources, industry reports, and public filings to construct a detailed market analysis. The output includes specific monetary figures for each market segment, alongside a clear breakdown of the calculations, key assumptions, and potential risks, ensuring transparency and credibility. This skill is invaluable for entrepreneurs, product managers, strategists, and analysts who need to quickly ascertain market potential, validate business ideas, or prepare for investor presentations without deep diving into manual data aggregation and complex modeling. It streamlines the market research process, providing a solid foundation for strategic decisions.

Best use case

The primary use case is to rapidly generate a credible market sizing report for a new or existing product/service. This benefits founders seeking investment, product managers evaluating new features, strategists planning market entry, and business analysts needing data-driven insights to support decision-making, providing a clear picture of market potential and achievable revenue.

Build defensible market sizing for any product, pitch deck, or business case. Top-down and bottom-up methodologies combined.

A structured report detailing TAM, SAM, and SOM values, including calculation methodologies, key assumptions, sources, and identified risks.

Practical example

Example input

Size the market for AI-powered contract review for mid-market law firms in the US

Example output

## Market Sizing: AI-powered contract review for mid-market law firms in the US

### TAM — $15.5B
Total legal tech market, then filtered for contract review. (Source: Gartner 2023 Legal Tech Report)

### SAM — $800M
Filtered by US, mid-market law firms (50-200 lawyers), 25% AI adoption rate.

### SOM (12-month) — $35M
Bottom-up: 5,000 reachable firms × $7,000 ACV × 10% conversion.

### Key Assumptions
- Average ACV for AI contract review is $7,000/year. (Source: Industry average estimates)
- 25% of mid-market law firms will adopt AI contract review within 3 years. (Source: Deloitte AI in Legal Survey)

### Risks to Sizing
- Slower-than-expected AI adoption due to regulatory concerns.
- Increased competition driving down ACV.

When to use this skill

Developing pitch decks and investor presentations.
Formulating go-to-market strategies for new products.
Conducting feasibility analysis for new business ideas.
Preparing for board presentations or internal business reviews.

When not to use this skill

When detailed financial projections beyond market size are required.
For deep competitive analysis beyond market share estimation.
When the primary need is for operational planning or execution of a GTM strategy.
If you need real-time market data that changes by the minute for dynamic trading decisions.

Installation

Claude Code / Cursor / Codex

$curl -o ~/.claude/skills/afrexai-market-sizing/SKILL.md --create-dirs "https://raw.githubusercontent.com/openclaw/skills/main/skills/1kalin/afrexai-market-sizing/SKILL.md"

Manual Installation

Download SKILL.md from GitHub
Place it in .claude/skills/afrexai-market-sizing/SKILL.md inside your project
Restart your AI agent — it will auto-discover the skill

How Market Sizing — TAM/SAM/SOM Calculator Compares

Feature / Agent	Market Sizing — TAM/SAM/SOM Calculator	Standard Approach
Platform Support	Not specified	Limited / Varies
Context Awareness	High	Baseline
Installation Complexity	easy	N/A

Frequently Asked Questions

What does this skill do?

Build defensible market sizing for any product, pitch deck, or business case. Top-down and bottom-up methodologies combined.

How difficult is it to install?

The installation complexity is rated as easy. You can find the installation instructions above.

Where can I find the source code?

You can find the source code on GitHub using the link provided at the top of the page.

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SKILL.md Source

# Market Sizing — TAM/SAM/SOM Calculator

Build defensible market sizing for any product, pitch deck, or business case. Top-down and bottom-up methodologies combined.

## What You Get

- **TAM** (Total Addressable Market) — entire market if you had 100% share
- **SAM** (Serviceable Addressable Market) — segment you can actually reach
- **SOM** (Serviceable Obtainable Market) — realistic capture in 12-36 months
- **Bottom-up validation** — unit economics × reachable customers
- **Source citations** — government data, industry reports, public filings

## How to Use

Tell me your product/service and target customer. I'll build the full sizing.

**Example prompts:**
- "Size the market for AI-powered contract review for mid-market law firms in the US"
- "TAM/SAM/SOM for a SaaS helpdesk targeting e-commerce brands doing $1M-$50M revenue"
- "Market size for automated bookkeeping for UK SMBs"

## Methodology

### Top-Down
1. Start with total industry revenue (cite source)
2. Filter by geography, segment, company size
3. Apply technology adoption rates
4. Result = SAM

### Bottom-Up
1. Count reachable customers (databases, directories, LinkedIn)
2. Multiply by realistic ACV (annual contract value)
3. Apply conversion rates at each funnel stage
4. Result = SOM

### Triangulation
Compare top-down and bottom-up. If they're within 2-3x of each other, the sizing holds. If wildly different, investigate assumptions.

## Output Format

```
## Market Sizing: [Product/Service]

### TAM — $X.XB
[Total market calculation with sources]

### SAM — $XXM
[Filtered by geography + segment + tech adoption]

### SOM (12-month) — $X.XM
[Bottom-up: customers × ACV × conversion]

### Key Assumptions
- [Assumption 1 + source]
- [Assumption 2 + source]

### Risks to Sizing
- [What could make this smaller]
- [What could make this bigger]
```

## When to Use This

- Pitch decks and investor presentations
- Go-to-market strategy planning
- New product feasibility analysis
- Board presentations and business cases
- Competitive positioning

## Pro Tip

Most founders oversize their TAM and undersize their SOM. Investors see through inflated numbers instantly. A tight, well-sourced $50M SAM beats a hand-wavy $10B TAM every time.

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Data & Research