---
title: Market Sizing Analysis
category: product
entity_type: skill
price: $15
canonical: https://forgehouse.ai/skills/market-sizing-analysis/
lang: en
hreflang_alt: https://forgehouse.ai/tr/skiller/market-sizing-analysis/
last_updated: 2026-06-20
---

# Market Sizing Analysis

> Size any market with TAM, SAM and SOM from three cross-checked methods, numbers investors actually trust.

Calculates Total Addressable, Serviceable Available, and Serviceable Obtainable Market (TAM/SAM/SOM) for any startup or business opportunity using three complementary methodologies: top-down, bottom-up, and value theory. It triangulates results so your market numbers are credible enough to survive investor scrutiny.

## Use cases
- Sizing the market opportunity for a startup or new product
- Calculating TAM/SAM/SOM for a fundraising deck
- Triangulating top-down and bottom-up estimates
- Estimating a market with no existing data via value theory
- Defining a beachhead segment to win first
- Pressure-testing market assumptions before strategy or investment

## Benefits
- Present market numbers investors actually trust
- Catch unrealistic estimates before they undermine your pitch
- Size brand-new categories where no research report exists
- Link a defensible SOM directly to your revenue projections

## What’s included
- Three-tier TAM/SAM/SOM framework with clear definitions
- Top-down, bottom-up, and value-theory methodologies with formulas
- Industry-specific templates for SaaS, marketplace, consumer, and B2B
- A six-step process from market definition to validation
- Triangulation and red-flag checks against common mistakes
- Presentation structures tailored for investors and for strategy

## Who it’s for
Founders, analysts, and strategists sizing market opportunity for fundraising or business planning.

## How it runs
A TAM slide is only as strong as its weakest assumption. The market gets defined in writing before any math, bottom-up leads because investors trust it, and a 30 percent disagreement triggers interrogation, not averaging.
1. Defines the market in writing before any number: the problem being solved, the target customer, the product category, the geographic scope and the time horizon, because a fuzzy definition makes every downstream figure meaningless.
2. Chooses the methodology by market maturity: bottom-up (customer count times unit revenue) as the primary because investors trust it most, top-down (industry reports narrowed by filters) for triangulation, and value theory (cost of the problem times willingness to pay) when the category is too new to have data.
3. Calculates TAM with the chosen method, then narrows to SAM by applying explicit filters in sequence: geography, product capability, customer segment and channel access, each filter documented as a percentage with its source.
4. Estimates SOM as a realistic 3-5 year capture: 2-5 percent of SAM for a new entrant, shaped as a beachhead segment where 15-20 percent dominance is achievable rather than a thin slice of everything.
5. Triangulates: if bottom-up and top-down disagree by more than 30 percent, the assumptions get interrogated, not averaged. Customer counts are checked against databases, pricing against real ACVs, and the result against public company revenues in the space.
6. Documents every assumption with a source or an explicit assumption tag and presents the three tiers together with the logic chain visible, leading with the bottom-up number because a defensible chain beats an impressive headline figure.

## FAQ
### We are creating a new category with no analyst reports. Can it still size the market?
Yes, that is what the value-theory methodology is for: you estimate from the value your product creates and what buyers would pay, then sanity-check it against a bottom-up build. The triangulation step exists precisely for markets where no ready-made research number exists.

### Why not just cite a big top-down number from an industry report?
Because investors discount single-method numbers. The framework runs top-down, bottom-up, and value theory side by side, triangulates the results, and applies red-flag checks against the common mistakes. That is what lets a TAM/SAM/SOM slide survive diligence questions.

### Does it come with live market data or research subscriptions?
No. It is the methodology: the three-tier definitions, formulas, industry templates for SaaS, marketplace, consumer, and B2B, and a six-step process from market definition to validation. The inputs, your pricing, segment counts, and any reports you hold, come from you.

## Price
$15, one-time, no subscription. VAT included.

Related guide: [AI for small business](https://forgehouse.ai/guides/ai-for-small-business/)