Market Size Calculator (TAM, SAM, SOM)
Estimate Total Addressable Market (TAM), Serviceable Available Market (SAM), and Share of Market (SOM) for pitch decks. Includes Bottom-Up wizard and industry benchmarks.
About
Investors generally ignore vague claims like "everyone is our customer." A credible pitch deck requires a rigorous market sizing exercise using the TAM, SAM, SOM framework. This tool helps founders structure their market logic from the ground up, moving away from "Top-Down" guesswork (which is often inflated) to "Bottom-Up" verification.
TAM (Total Addressable Market) represents the total revenue opportunity if you had 100% market share. SAM (Serviceable Available Market) filters this by geography or specialized segment. Finally, SOM (Serviceable Obtainable Market) is the realistic short-term target you can capture given your current resources. This calculator provides a guided workflow to quantify these metrics using standard ARPU (Average Revenue Per User) benchmarks.
Formulas
The Bottom-Up calculation is derived as follows:
Where Ntotal is the total count of potential customers and ARPU is Average Revenue Per User.
Reference Data
| Industry Sector | Avg. ARPU (Monthly) | Avg. ARPU (Annual) |
|---|---|---|
| SaaS (B2B Enterprise) | $500 − 5000 | $6k − 60k |
| SaaS (B2C / SMB) | $20 − 100 | $240 − 1.2k |
| E-Commerce (Fashion) | N/A | $80 /order |
| Mobile App (Subscription) | $5 − 15 | $60 − 180 |
| EdTech / Courses | N/A | $200 /user |
| FinTech (Consumer) | $5 − 20 | $60 − 240 |