TAM SAM SOM Calculator

How to Use the TAM SAM SOM Calculator

• Enter Total Addressable Market (TAM): the total revenue opportunity if you captured 100% of your market. Use industry reports, government data, or bottom-up calculation.
• Enter SAM as % of TAM: the percentage you can actually serve with your current product, geography, and business model constraints.
• Enter SOM as % of SAM: the realistic market share you can capture in the next 3-5 years given competition, distribution, and execution capacity.

Tip: VCs see through inflated TAM numbers. Use bottom-up calculations (number of target customers x average revenue per customer) rather than top-down industry reports.

TAM SAM SOM Framework

TAM (Total Addressable Market): The total market demand for your product/service. This is the theoretical maximum. For a fintech lending platform: total outstanding credit in India = Rs 150+ Lakh Crore.

SAM (Serviceable Addressable Market): The portion of TAM you can reach with your current product and go-to-market. For that same lending platform targeting only SME digital loans in Tier 1-2 cities: maybe Rs 5-10 Lakh Crore.

SOM (Serviceable Obtainable Market): The realistic revenue you can capture in 3-5 years. With current team, funding, and competitive landscape: maybe Rs 500-2,000 Crore in originations.

Bottom-Up vs Top-Down TAM Calculation

Top-Down (VCs discount this): Start with a large industry number and slice it. “India digital payments market is $3 trillion. If we get 0.1%, that is $3 billion.” This is lazy and unconvincing.

Bottom-Up (VCs respect this): Start with unit economics and scale up. “There are 63 million SMEs in India. 15 million are digitally active. Our product serves the 4 million that need working capital loans of Rs 5-50 Lakh. Average loan size: Rs 12 Lakh. TAM = 4M x Rs 12L = Rs 4.8 Lakh Crore in originations. At 5% net interest margin, revenue TAM = Rs 24,000 Crore.”

The bottom-up approach forces you to define your customer precisely and shows investors you understand unit economics. Always present both approaches and explain why your bottom-up is more credible.

TAM Sizing for Indian Fintech Verticals

• Digital Lending (India): TAM Rs 150+ Lakh Crore total credit. SAM (digital-first SME lending): Rs 5-10 Lakh Crore. Growing at 30%+ CAGR.
• Digital Payments: TAM $3+ trillion transaction volume. UPI alone processes Rs 20+ Lakh Crore monthly.
• Insurtech: TAM Rs 7+ Lakh Crore premium market. Digital distribution SAM: Rs 50,000-80,000 Crore. Insurance penetration at 4% means massive headroom.
• Wealthtech: TAM Rs 60+ Lakh Crore AUM in mutual funds + stocks. Digital-first retail investors (SAM): Rs 15-20 Lakh Crore.
• Neobanking: TAM 400M+ underbanked Indians. SAM (smartphone users with income): 150-200M users.

Sources: RBI Annual Report, IRDAI, SEBI, NPCI data, RedSeer/Redseer Consulting reports 2025-26.