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Market Sizing — TAM/SAM/SOM Calculator

install
source · Clone the upstream repo
git clone https://github.com/openclaw/skills
Claude Code · Install into ~/.claude/skills/
T=$(mktemp -d) && git clone --depth=1 https://github.com/openclaw/skills "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/1kalin/afrexai-market-sizing" ~/.claude/skills/openclaw-skills-afrexai-market-sizing && rm -rf "$T"
OpenClaw · Install into ~/.openclaw/skills/
T=$(mktemp -d) && git clone --depth=1 https://github.com/openclaw/skills "$T" && mkdir -p ~/.openclaw/skills && cp -r "$T/skills/1kalin/afrexai-market-sizing" ~/.openclaw/skills/openclaw-skills-afrexai-market-sizing && rm -rf "$T"
manifest: skills/1kalin/afrexai-market-sizing/SKILL.md
tags
#market-sizing#business-analysis#financial-modeling#data-analysis#research#strategy
source content

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.

Need the full business context pack for your industry? Browse AfrexAI Context Packs — pre-built agent configs for Fintech, Healthcare, Legal, SaaS, and 6 more verticals ($47 each).

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