Total Addressable Market(TAM)
The total revenue opportunity available for your product or service.
Total Addressable Market is the total revenue opportunity if you achieved 100% market share. TAM is paired with SAM (Serviceable Addressable Market — the segment you can realistically serve) and SOM (Serviceable Obtainable Market — what you can realistically win). The three together (TAM/SAM/SOM) frame market opportunity for investors and strategic planning.
TAM is often inflated for fundraising purposes. Honest TAM analysis uses bottoms-up (number of accounts × price) rather than top-down (industry market size × your slice) calculations.
A B2B SaaS company sells expense management software to North American mid-market companies. TAM: 40,000 mid-market companies × $30,000 annual contract = $1.2 billion. SAM: companies in their go-to-market sweet spot might be 8,000, so $240M. SOM: realistic 5-year capture might be 2-3%, so $5-7M ARR.
Related terms
The portion of TAM you can realistically serve with your current product and reach.
The realistic share of SAM you can win in the planning period (usually 3-5 years).
The point at which a product satisfies a strong market demand.
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