Market Sizing TAM SAM SOM Calculator

Calculate your Total Addressable Market (TAM), Serviceable Addressable Market (SAM), and Serviceable Obtainable Market (SOM) with both top-down and bottom-up methodologies for investor-ready market analysis.

Prompt Template

You are a strategy consultant with expertise in market sizing and competitive analysis. Help me calculate my TAM, SAM, and SOM.

Business context:
- Product/service: [describe what you sell]
- Industry: [your industry]
- Target customer: [who buys this — be specific about company size, role, geography]
- Pricing model: [subscription, one-time, usage-based, etc.]
- Average revenue per customer: [annual or monthly]
- Current customers: [number, if any]
- Geographic focus: [local / national / global — specify countries]
- Key competitors: [list 2-5 competitors and their approximate scale]
- Year for analysis: [current year or projection year]

Please provide:

1. **TAM (Total Addressable Market)** — The total global revenue opportunity if you had 100% market share:
   - Top-down approach: Start from industry reports, total market value, and narrow down
   - Bottom-up approach: Total potential customers × average revenue per customer
   - Show your math clearly with data sources noted

2. **SAM (Serviceable Addressable Market)** — The portion of TAM you can realistically reach given your:
   - Geographic limitations
   - Product capabilities vs. full market needs
   - Customer segment focus
   - Channel limitations
   - Calculate as a percentage and dollar value of TAM

3. **SOM (Serviceable Obtainable Market)** — What you can realistically capture in the next 1-3 years:
   - Based on your current growth rate, team size, and competitive position
   - Factor in market share of comparable startups at your stage
   - Provide conservative, moderate, and aggressive scenarios

4. **Market Growth Analysis** — Projected CAGR for your market segment and key growth drivers/headwinds.

5. **Competitive Market Share Map** — Estimate how the current market is divided among key players, and identify the white space you're targeting.

6. **Investor-Ready Summary Slide** — A concise one-slide format with the TAM/SAM/SOM concentric circles and the 3-4 key stats an investor wants to see.

7. **Methodology Notes** — Document assumptions, data sources, and limitations so investors know your analysis is rigorous, not aspirational.

Example Output

# Market Sizing: CloudInvoice — AI-Powered Invoicing for Freelancers

1. TAM (Total Addressable Market)

Top-Down Approach

- Global invoicing & billing software market: $12.3B (2025, Grand View Research)

- SMB segment (< 50 employees): 42% = **$5.17B**

- Freelancer/solo subsegment: ~18% of SMB = **$930M**

Bottom-Up Approach

- Global freelancers (full-time + significant part-time): 78M (Statista 2025)

- % who invoice clients regularly: ~45% = 35.1M

- Willingness to pay for invoicing tools: ~30% = 10.5M potential paying users

- Average annual revenue per user: $96/year ($8/month)

- **Bottom-up TAM: 10.5M × $96 = $1.008B**

TAM Consensus: ~$970M (average of both approaches)

2. SAM (Serviceable Addressable Market)

| Filter | Reduction | Reasoning |

|--------|-----------|----------|

| English-speaking markets only (US, UK, CA, AU, NZ) | 35% of TAM | Current product is English-only |

| Tech-savvy freelancers (digital, creative, consulting) | 60% of above | Our AI features need digital-first users |

| Not locked into enterprise accounting suites | 80% of above | Excludes QuickBooks/Xero power users |

SAM = $970M × 35% × 60% × 80% = $163M

3. SOM (Serviceable Obtainable Market) — Next 3 Years

|----------|--------|--------|--------|--------------|

| Conservative | $820K | $2.1M | $4.8M | 2.9% of SAM |

| Moderate | $1.2M | $3.8M | $8.5M | 5.2% of SAM |

| Aggressive | $1.8M | $5.5M | $14M | 8.6% of SAM |

**Moderate SOM rationale:** Comparable vertical SaaS tools (Honeybook, Bonsai) captured 4-6% of their SAM within 3 years of product-market fit.

6. Investor-Ready Summary

┌─────────────────────────────────────┐

│ TAM: $970M │

│ Global freelancer invoicing │

│ ┌───────────────────────────┐ │

│ │ SAM: $163M │ │

│ │ English-speaking, digital │ │

│ │ ┌─────────────────┐ │ │

│ │ │ SOM: $8.5M │ │ │

│ │ │ Year 3 moderate │ │ │

│ │ └─────────────────┘ │ │

│ └───────────────────────────┘ │

└─────────────────────────────────────┘

Market CAGR: 14.2% (2025-2030)

78M+ freelancers globally, growing 12% YoY

Incumbents haven't solved AI-native invoicing

7. Methodology Notes

- Industry data: Grand View Research, Statista, Bureau of Labor Statistics

- Freelancer count: Statista Global Freelancer Survey 2025 (conservative estimate — Upwork reports higher)

- ARPU based on competitive pricing analysis of Wave, Bonsai, and Freshbooks free→paid tiers

- **Key assumption:** 30% willingness-to-pay rate. Sensitivity: at 20%, TAM drops to $672M; at 40%, TAM rises to $1.34B

Tips for Best Results

💡Investors see inflated TAMs constantly — using both top-down AND bottom-up approaches that converge builds massive credibility.
💡Your SOM is what investors care most about — it shows you understand your realistic near-term opportunity, not just the dream.
💡Always document your assumptions explicitly. An investor who disagrees with an assumption can adjust the model; one who can't see your assumptions will just discount everything.
💡Update your market sizing quarterly — markets shift, and stale numbers in a pitch deck signal you're not paying attention.