Free Market Size Calculator
Estimate your TAM, SAM, and SOM with transparent assumptions, so you know how big the opportunity really is before you build.
Market size calculator: TAM, SAM, and SOM in seconds
This free market size calculator estimates your total addressable market (TAM), serviceable addressable market (SAM), and serviceable obtainable market (SOM), and shows the assumptions behind every number so you can pressure-test it. Use it to decide whether a market is big enough to be worth building for.
How to size your market
- 1. Describe your business or product.
- 2. Add your target customer, price point, and geography for a tighter estimate.
- 3. Review the TAM, SAM, and SOM with their basis and assumptions.
- 4. Confirm there is real demand behind the market with the niche finder and idea evaluator.
Frequently asked questions
What is TAM, SAM, and SOM?
TAM is total demand, SAM is the slice you can serve, and SOM is what you can realistically win early on.
How do I calculate market size?
Use a bottom-up (customers times price) or top-down (share of an industry figure) method. This tool shows both with the assumptions used.
Related tools and reading:
Validate the demand behind the market
A big market means nothing without real demand. BigIdeasDB shows you the documented pain points and revenue behind any niche.
Explore BigIdeasDB