TAM SAM SOM Calculator
Estimate your Total, Serviceable, and Obtainable market in seconds. Free, no signup, bottom-up model.
These are your assumptions, not market reality. The hard part is knowing whether the demand, competition, and capture rate are actually true.
Validate the real numbers with IdeaCrystal →What TAM, SAM, and SOM mean
- TAM (Total Addressable Market) — total revenue if every possible customer bought your product. The ceiling.
- SAM (Serviceable Available Market) — the slice of TAM you can actually reach with your product, segment, and geography.
- SOM (Serviceable Obtainable Market) — the realistic share of SAM you can capture in the first 1–3 years given competition and resources.
How to calculate it (bottom-up)
Bottom-up sizing is the method investors trust — it forces real assumptions instead of a hand-wavy “1% of a billion-dollar market.”
- TAM = total potential customers × annual revenue per customer
- SAM = TAM × % you can serve (your real segment + geography)
- SOM = SAM × % you can realistically win in 1–3 years
Frequently asked questions
What is TAM, SAM, and SOM?
TAM (Total Addressable Market) is the total revenue opportunity if every potential customer bought. SAM (Serviceable Available Market) is the share you can actually serve given your segment and geography. SOM (Serviceable Obtainable Market) is the share you can realistically capture in the near term.
How do you calculate TAM SAM SOM?
Bottom-up: TAM = total potential customers × annual revenue per customer. SAM = TAM × the percentage you can serve. SOM = SAM × the percentage you can realistically win in 1–3 years. Bottom-up sizing is more credible to investors than top-down "1% of a huge market" claims.
What is a good SOM percentage?
For an early-stage startup, a realistic SOM is usually 1–10% of your SAM within the first few years, depending on competition, distribution, and budget. Anything above ~10% needs strong justification.
The numbers are only as good as your assumptions
A calculator can’t tell you whether the demand is real, how crowded the market already is, or whether your capture rate is fantasy. IdeaCrystal validates those assumptions against 50+ live data sources — real search demand, competitor traffic, and an evidence-backed market-size estimate — and returns a Go/No-Go report in 30–60 minutes.