What is TAM, SAM, SOM?
Total, serviceable and obtainable market — three ways to size the opportunity.
TAM is everyone with the problem × what they would pay. SAM is the part your product and channels can serve. SOM is what you can realistically win in 3–5 years. Build them bottom-up.
Example
Go deeper · Founder Playbook, Level 2Market sizing in India: TAM, SAM and SOM without fake numbers →2 lakh clinics × ₹30,000/year = ₹600 crore TAM.