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Market Sizing Framework (TAM / SAM / SOM)
Institutional-grade Top-Down & Bottom-Up market estimation framework for investor pitches.
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What this tool actually does
Every VC pitch requires a rigorously defended TAM/SAM/SOM slide. This calculator builds two parallel estimates simultaneously — a Top-Down population funnel AND a Bottom-Up unit economics model — and then cross-validates both to ensure your market sizing is internally consistent. Mismatches instantly flag modeling errors before you get into the room.
Market Assumptions
Top-Down Parameters
%
%
%
$
%
Bottom-Up Validation
$
TAM — Total Addressable Market
$1.05T
210,000,000 potential users
If you captured 100% of the target segment.
SAM — Serviceable Addressable
$420.0B
84,000,000 potential users
Digitally reachable 40% of TAM.
SOM — Serviceable Obtainable
$21.0B
4,200,000 potential users
Realistic 5% market capture goal.
Bottom-Up vs Top-Down Cross-Validation
Top-Down SOM
$21.0B
vs
Bottom-Up Revenue
$245.0M
50,000 × $350 × 14x
⚠️ Convergence Ratio 85.71x — Misalignment Detected
5-Year TAM / SAM / SOM Growth at 18% CAGR
Market_Sizing_TAM_SAM_SOM_Framework.xlsx
fx
=Population * Segment% * Addressable% * Obtainable% * ARPU
| Market Sizing Parameter | Current Year | Year 2 | Year 3 | Year 4 | Year 5 | |
|---|---|---|---|---|---|---|
| 1 | Total Population Analyzed | 1,400,000,000 | 1,400,000,000 | 1,400,000,000 | 1,400,000,000 | 1,400,000,000 |
| 2 | Target Segment (15%) | 210,000,000 | 210,000,000 | 210,000,000 | 210,000,000 | 210,000,000 |
| 3 | TAM — Total Addressable Market | $1.05T | $1.24T | $1.46T | $1.73T | $2.04T |
| 4 | SAM — Serviceable Addressable (40% of TAM) | $420.0B | $495.6B | $584.8B | $690.1B | $814.3B |
| 5 | SOM — Serviceable Obtainable (5% of SAM) | $21.0B | $24.8B | $29.2B | $34.5B | $40.7B |
VC Market Sizing Analyst Engine
Top-Down / Bottom-Up Disconnect: Your Top-Down SOM ($21.0B) is 85.7x larger than your Bottom-Up Revenue estimate ($245.0M). This is a massive red flag. Investors will penalize you for it. Either your Top-Down Obtainable Market % (5%) is aggressively overstated, or your Bottom-Up plan for 50,000 customers needs to be dramatically expanded. Align the two methodologies before your pitch or expect hard questions.
Market Sizing Glossary
🌍 TAM — Total Addressable Market
The maximum theoretical revenue opportunity if your solution captured 100% of the target segment. Do NOT confuse this with reality — TAM is a ceiling, not a target. An overstated TAM is the biggest red flag for experienced VCs.
🎯 SAM — Serviceable Addressable Market
The subset of TAM that your specific product, geography, and distribution model can realistically reach. If you are building for India, SAM excludes markets you cannot serve yet (US, EU, etc.).
🏆 SOM — Serviceable Obtainable Market
The realistic revenue target you can actually capture within the next 3–5 years given your current funding, team, and market position. SOM is the only number investors care about for near-term financial models.
🔄 ARPU — Average Revenue Per User
The average annualized revenue extracted from each paying customer. Multiplied by the estimated user pool, ARPU is the engine that converts "number of people" into "dollars of revenue" — the critical bridge between user count and market size.