TAM, SAM, SOM Sizing Model

A universal sizing and valuation model with inputs to determine potential company revenues and profitability over a 5-year period.

TAM, SAM, SOM Sizing Model
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Video Overview:

Overview

This Excel template is designed for fast, top-down forecasting of a company’s potential revenue, margins, and profitability over a 5-year period. The model prioritizes simplicity and usefulness: a small set of high-impact assumptions produces a complete financial view (down to EBITDA), plus scenario outputs and visuals.

The core structure is based on TAM → SAM → SOM:

  • TAM (Total Addressable Market): total potential customers / units in the market

  • SAM (Serviceable Addressable Market): the portion of TAM the business can realistically serve (driven by “serviceability”)

  • SOM (Serviceable Obtainable Market): the portion of SAM the business can actually win (driven by market penetration / adoption over time)

Model Structure (Top-Down Mechanics)

The model uses a consistent, reusable logic by channel:

  1. TAM (by year) is adjustable to reflect market growth (e.g., increased demand, awareness, category expansion).

  2. A Serviceability assumption (constant over 5 years, per channel) converts TAM → SAM.

    • Serviceability represents structural constraints (coverage, eligibility, access, distribution limits).

  3. A Market penetration assumption (adjustable by year, per channel) converts SAM → SOM.

    • Penetration ramps over time to reflect increasing adoption and share capture.

This approach makes it easy to test “how big can this be?” and “what does profitability look like?” without building a bottom-up pipeline model.

Key Configuration Options

Channels (Segments)

  • Configure up to 3 target channels, each with separate assumptions:

    • TAM, serviceability (TAM→SAM), and penetration ramp (SAM→SOM)

    • Direct cost structure and unit economics

    • Start year per channel (to reflect staggered launches or rollout timing)

Forecast Horizon

  • Models up to 5 years

  • Adjustable start years for each channel and for the fixed expense schedule

Scenarios

  • Three built-in cases: Downside, Base, Upside

  • Scenario framework targets two main levers:

    1. TAM growth multiplier (market expands faster/slower)

    2. Penetration ramp multiplier (adoption/share capture faster/slower)

  • Users can adjust the magnitude of downside and upside relative to base.

Cost & Margin Modeling (High-Impact, Low-Friction)

Direct costs are intentionally kept high level so users don’t get bogged down:

For each channel, the model supports direct costs across:

  • COGS

  • Variable costs

  • Direct labor

For each direct cost type, there are only two input rows:

  • % of revenue

  • Cost per unit (or per customer)

This enables differentiated margin profiles by channel while keeping inputs minimal. You don’t need to itemize cost build-ups—just enter the best estimate of total burden as a percent and/or per-unit amount.

Outputs & What You Get

Financial Outputs

  • Detailed roll-up down to EBITDA

  • High-level summary across major assumption tabs

Key Metrics (included in the template)

  • Implied value per unit / customer

  • Gross margin by year (overall and by channel)

  • Revenue growth rate by year

  • Market growth tracking

  • Valuation per year

Valuation / Per-Share Estimation

  • Input outstanding shares per year

  • Input an EBITDA and/or Revenue multiple

  • Model produces an estimated price per share for each forecast year

Visualization

  • Includes 13 charts/visualizations for quick interpretation and presentation.

Design Decisions (Why It’s Built This Way)

  • Serviceability is constant over 5 years (per channel):
    This is a reusable template assumption representing structural constraints. It stays fixed to reduce complexity while remaining adjustable across channels.

    • A scenario where serviceability should change is when distribution/coverage expands materially during the forecast period; this template intentionally does not model that dynamic.

  • Penetration is adjustable each year:
    This expresses the company progressively winning share—one of the most important drivers of SOM ramp.

  • TAM is adjustable each year:
    Markets can grow as perceptions shift, trends take hold, or the category expands.

Best Use Case

This model works best as a screening and sizing tool:

  • You want a quick, coherent view of potential scale + profitability

  • You want scenario ranges without a heavy operational build

  • You want channel-level economics and consolidated performance in one place

If you want, I can also turn this into a one-page “Model Instructions” section (inputs → outputs workflow) that you can paste directly into the first tab of the Excel file.

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