Glossary · Strategy
What is TAM, SAM, and SOM?
Definition
TAM, SAM, and SOM are three nested market-size estimates: the total addressable market, the serviceable available market you can realistically reach, and the serviceable obtainable market you can capture.
SOM = SAM × realistic market share %
Why it matters
These numbers keep your plan grounded. TAM is the full demand for the category, SAM is the part your business model and location can actually serve, and SOM is the share you can win in the near term.
Consider a mobile car-detailing business in one metro area. TAM might be all 2 million drivers in the state spending around $200 a year on detailing, or $400 million. SAM is the 300,000 drivers within your service radius, or $60 million. SOM is the 1 percent you can plausibly win in year one, 3,000 customers, or $600,000.
Use real sources such as census data, trade associations, and local counts rather than inflated global figures.
Common mistakes
- !Claiming that capturing 1 percent of a giant market proves the idea is big enough.
- !Using top-down numbers only, without checking that real customers exist nearby.
Frequently asked questions
What is TAM, SAM, and SOM?
TAM, SAM, and SOM are three nested market-size estimates: the total addressable market, the serviceable available market you can realistically reach, and the serviceable obtainable market you can capture.
How do you calculate TAM, SAM, and SOM?
SOM = SAM × realistic market share %
What mistakes do beginners make with TAM, SAM, and SOM?
Claiming that capturing 1 percent of a giant market proves the idea is big enough. Using top-down numbers only, without checking that real customers exist nearby.
Related terms