What is TAM?
Total Available Market (TAM) is the total revenue opportunity available for a product or service if a company were to achieve 100% market share. TAM is calculated using top-down (industry data) or bottom-up (target customers × average price) approaches.
TAM is the largest of three concentric market metrics: TAM > SAM (serviceable available market) > SOM (serviceable obtainable market). Investors look for TAM ≥ US$1 billion for venture-scale opportunities.