market-sizing

Generates TAM, SAM, and SOM estimates with sourced assumptions and confidence ranges.

1|Updated Mar 21, 2026

Search Tags:#go-to-market #market research #pitch deck #market sizing #tam sam som #investment memo #bottom-up analysis

Ready to run

npx skills add https://github.com/kalilurrahman/kr-claudiator-skills-original-prompts --skill market-sizing-kalilurrahman

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: market-sizing
Source: https://github.com/kalilurrahman/kr-claudiator-skills-original-prompts/tree/main/09-product-management/market-sizing
Command: npx skills add https://github.com/kalilurrahman/kr-claudiator-skills-original-prompts --skill market-sizing-kalilurrahman

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve? Estimating market size for a pitch deck, strategy doc, or investment memo is time-consuming and often produces inflated, unsourced numbers. This Skill produces defensible TAM/SAM/SOM estimates where every figure traces back to a source or an explicit calculation. ## Core Features & Use Cases - Dual-method TAM calculation: Computes both top-down (industry report) and bottom-up (customers x ARPU) estimates and reconciles the gap. - Scenario-based SOM: Produces conservative, base, and optimistic capture scenarios grounded in comparable company benchmarks. - Transparent assumptions and sources: Outputs an assumptions table with confidence ratings and a numbered source list. - Use Case: A founder preparing a seed-round pitch needs a market sizing slide for an AI-powered recruiting tool. Provide the product description and receive a two-page sizing analysis with sourced TAM, filtered SAM, and a realistic SOM range. ## Quick Start Estimate the market size for a B2B SaaS tool that automates invoice processing for mid-market accounting firms in North America.

Frequently Asked Questions about market-sizing

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I calculate TAM, SAM, and SOM for a pitch deck?▼

Calculate TAM using both top-down industry reports and bottom-up customer count times ARPU, then filter TAM by geography and segment to get SAM. Estimate SOM from realistic capture rates based on comparable company growth benchmarks, and present conservative, base, and optimistic scenarios.

What is the difference between top-down and bottom-up market sizing?▼

Top-down sizing starts from an industry report's total market figure and narrows it down. Bottom-up sizing multiplies the number of potential customers by average revenue per customer. Bottom-up estimates are generally more trustworthy for niche markets.

How do I estimate SOM without making up a market share percentage?▼

Ground SOM in comparable company growth rates, typical market penetration for your go-to-market model, and competitive dynamics. Provide a conservative, base, and optimistic range rather than a single arbitrary percentage of SAM.

What should I do when reliable market data is not available?▼

Flag the missing data explicitly and provide a placeholder range instead of guessing. Note what research would increase confidence, such as primary interviews with target buyers to validate ARPU assumptions.

How precise should market sizing numbers be in an investor memo?▼

Round numbers appropriately, such as writing $4.2M instead of $4,237,891, because false precision erodes credibility. Every figure should trace back to a source or a visible calculation, and single-source data points should be flagged as low confidence.