TAM SAM SOM Calculator
Size your market bottom-up: count the customers who could buy, multiply by what each pays per year, then narrow to the segment you can serve and the share you can realistically win.
Your numbers
- Customers needed for SOM
- 50,000
Fund Force runs an AI analysis of your market and matches you with investors, accelerators and grants that fit your stage and sector.
Get matched with Fund Force →The formula, in plain English
- TAM = Total potential customers × Annual value per customer
- SAM = TAM × Serviceable share %
- SOM = SAM × Obtainable share % (3–5 years)
Frequently asked questions
Top-down or bottom-up market sizing?
Investors trust bottom-up (customers × price) far more than top-down industry reports, because it shows you understand who buys and at what price.
How big should TAM be for VC?
Venture investors usually want a TAM above $1B so that a big outcome is possible, though a fast-growing smaller market can work.
What SOM is realistic?
Typically 1–10% of SAM within 3–5 years, backed by your go-to-market plan and current traction.
Results are estimates for planning and education — not financial, legal or tax advice.