Size your market with AI.
Describe your idea and our AI estimates your TAM, SAM, and SOM — with the assumptions it used, so you can defend the numbers.
The total global demand for your product if every potential customer bought it. A ceiling, not a target.
The portion of TAM you can realistically reach given your business model, geography, and channels.
The slice of SAM you can win in the next 3–5 years given your resources and competitive position. Your actual target.
What is TAM SAM SOM?
TAM, SAM, and SOM are three concentric circles that describe market opportunity at different levels of realism. Investors use them to assess whether an opportunity is worth funding. Founders use them to set realistic targets and plan go-to-market.
TAM — Total Addressable Market
The total global revenue opportunity if you had 100% market share. It answers: "How big is this market in the best-case world?" Use this to show investors the ceiling of the opportunity. TAM is usually measured in billions.
SAM — Serviceable Available Market
The subset of TAM you can actually reach given your product, geography, distribution channels, and business model. If you're building a tool for US physiotherapists, the SAM is not the global healthcare market — it's US allied health practitioners who could benefit from your specific solution.
SOM — Serviceable Obtainable Market
The realistic share of SAM you can capture in 3–5 years, given your resources, team, and competitive position. This is your actual business target. SOM is typically 1–5% of SAM for early-stage companies. A convincing SOM comes from bottom-up math: customers × price.
How to calculate market size
There are two approaches. Use both and triangulate:
Start with a total industry figure from a report (e.g. “global project management software market: $7B”) and apply percentages to narrow to your slice.
Quick but often misleading. Good for illustrating the ceiling.
Count the actual customers and multiply by your price. More work, far more credible.
Investors trust this — it shows you understand your customer.