TAM SAM SOM Calculator
deanpeters/Product-Manager-Skills
Calculates total, serviceable available and serviceable obtainable market size for a product idea with explicit assumptions, methods and caveats.
Estimate market size using TAM, SAM, and SOM with top-down and bottom-up approaches.
Install Market Sizing
$ npx skills add phuryn/pm-skills --skill market-sizing -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install phuryn/pm-skills market-sizing --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/phuryn/pm-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/pm-market-research/skills/market-sizing .claude/skills/market-sizing && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "market-sizing" agent skill from https://github.com/phuryn/pm-skills/tree/main/pm-market-research/skills/market-sizing into .claude/skills/market-sizing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "market-sizing", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/phuryn/pm-skills/tree/main/pm-market-research/skills/market-sizingType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add phuryn/pm-skills --skill market-sizing -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install phuryn/pm-skills market-sizing --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/phuryn/pm-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/pm-market-research/skills/market-sizing .agents/skills/market-sizing && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "market-sizing" agent skill from https://github.com/phuryn/pm-skills/tree/main/pm-market-research/skills/market-sizing into .agents/skills/market-sizing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "market-sizing", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add phuryn/pm-skills --skill market-sizing -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install phuryn/pm-skills market-sizing --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/phuryn/pm-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/pm-market-research/skills/market-sizing .cursor/skills/market-sizing && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "market-sizing" agent skill from https://github.com/phuryn/pm-skills/tree/main/pm-market-research/skills/market-sizing into .cursor/skills/market-sizing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "market-sizing", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/phuryn/pm-skills.git --path pm-market-research/skills/market-sizing--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add phuryn/pm-skills --skill market-sizing -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install phuryn/pm-skills market-sizing --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/phuryn/pm-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/pm-market-research/skills/market-sizing .gemini/skills/market-sizing && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "market-sizing" agent skill from https://github.com/phuryn/pm-skills/tree/main/pm-market-research/skills/market-sizing into .gemini/skills/market-sizing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "market-sizing", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install phuryn/pm-skills market-sizingInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add phuryn/pm-skills --skill market-sizing -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/phuryn/pm-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/pm-market-research/skills/market-sizing .github/skills/market-sizing && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "market-sizing" agent skill from https://github.com/phuryn/pm-skills/tree/main/pm-market-research/skills/market-sizing into .github/skills/market-sizing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "market-sizing", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add phuryn/pm-skills --skill market-sizing -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install phuryn/pm-skills market-sizing --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/phuryn/pm-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/pm-market-research/skills/market-sizing .opencode/skills/market-sizing && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "market-sizing" agent skill from https://github.com/phuryn/pm-skills/tree/main/pm-market-research/skills/market-sizing into .opencode/skills/market-sizing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "market-sizing", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
market-sizing- GitHub stars
- 27k
- Token cost
- ~1.1k tokens
- SKILL.md length
- 477 words
- Files
- 1
- Skills in repo
- 67
- Repo updated
- First seen
- Licence
- MIT
At a glance
Estimate market size using TAM, SAM, and SOM with top-down and bottom-up approaches.
- Works in 7 steps: Market Definition: Define the market… → Top-Down Estimation: Start from total… → Bottom-Up Estimation: Build from unit… → …
- Sizing a market opportunity
- SKILL.md covers Purpose, Instructions and Best Practices
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Market Sizing is an agent skill from phuryn/pm-skills. Estimate market size using TAM, SAM, and SOM with top-down and bottom-up approaches. Use when sizing a market opportunity, estimating addressable market, preparing for investor pitches, or evaluating market entry.
Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Product & Project Management, covering Market sizing. The repository describes itself as: PM Skills Marketplace: 100+ agentic skills, commands, and plugins — from discovery to strategy, execution, launch, and growth. The licence is MIT.
When your agent uses it
- Sizing a market opportunity
- Estimating addressable market
- Preparing for investor pitches
- Evaluating market entry
Example prompts
- “/market-sizing”
Workflow steps
7 steps, taken from the first numbered list in SKILL.md.
- Market Definition: Define the market boundaries — what problem space, which customer segments, what geography or constraints apply
- Top-Down Estimation: Start from total industry size and narrow to the relevant slice
- Bottom-Up Estimation: Build from unit economics (customers × price × frequency) to cross-validate
- SAM Scoping: Identify which portion of TAM is realistically serviceable given product capabilities, channels, and constraints
- SOM Estimation: Estimate achievable share in the next 1-3 years based on competitive position and go-to-market capacity
- Growth Projection: Forecast how TAM, SAM, and SOM may evolve over the next 2-3 years
- Assumption Mapping: Surface the key assumptions underlying each estimate
What it can do on your machine
Read from SKILL.md and the folder at commit 8607e3b. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
productcompass.pm
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Market Sizing loads about 1.1k tokens when it runs. Until then it costs about 57 tokens; SKILL.md has 477 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from phuryn/pm-skills at commit 8607e3b, republished under its MIT licence (© phuryn). 477 words, ~1,105 tokens.
Download SKILL.mdSave it as
.claude/skills/market-sizing/SKILL.md (or your agent's skills folder).- name
- market-sizing
- description
- Estimate market size using TAM, SAM, and SOM with top-down and bottom-up approaches. Use when sizing a market opportunity, estimating addressable market, preparing for investor pitches, or evaluating market entry.
Estimate Market Size (TAM, SAM, SOM)
Purpose
Estimate the Total Addressable Market (TAM), Serviceable Addressable Market (SAM), and Serviceable Obtainable Market (SOM) for a product. Includes both top-down and bottom-up estimation approaches, growth projections, and key assumptions to validate.
Instructions
You are a strategic market analyst specializing in market sizing, opportunity assessment, and growth forecasting.
Input
Your task is to estimate the market size for $ARGUMENTS within the specified market constraints (geography, industry vertical, customer type, etc.).
If the user provides market research, industry reports, financial data, or competitor information, read and analyze them directly. Use web search to find current market data, industry reports, and growth projections.
Analysis Steps (Think Step by Step)
- Market Definition: Define the market boundaries — what problem space, which customer segments, what geography or constraints apply
- Top-Down Estimation: Start from total industry size and narrow to the relevant slice
- Bottom-Up Estimation: Build from unit economics (customers × price × frequency) to cross-validate
- SAM Scoping: Identify which portion of TAM is realistically serviceable given product capabilities, channels, and constraints
- SOM Estimation: Estimate achievable share in the next 1-3 years based on competitive position and go-to-market capacity
- Growth Projection: Forecast how TAM, SAM, and SOM may evolve over the next 2-3 years
- Assumption Mapping: Surface the key assumptions underlying each estimate
Show full SKILL.md (258 more words)Show less
Output Structure
Market Definition
- Problem space and customer need
- Geographic and segment boundaries
- Key constraints or scoping decisions
TAM (Total Addressable Market)
- Top-down estimate with sources and reasoning
- Bottom-up estimate for cross-validation
- Reconciliation of the two approaches
- Current TAM value (annual revenue opportunity)
SAM (Serviceable Addressable Market)
- Which portion of TAM the product can realistically serve
- Constraints: geography, language, channels, product capabilities, pricing tier
- SAM as percentage of TAM with reasoning
SOM (Serviceable Obtainable Market)
- Realistic share achievable in 1-3 years
- Basis: competitive position, go-to-market capacity, current traction
- SOM as percentage of SAM with reasoning
Market Summary Table
| Metric | Current Estimate | 2-3 Year Projection |
|---|---|---|
| TAM | ||
| SAM | ||
| SOM |
Growth Drivers & Trends
- Key factors that could expand or contract the market
- Technology, regulatory, demographic, or behavioral shifts
- Emerging segments or adjacent markets
Key Assumptions & Risks
- Critical assumptions behind each estimate (numbered)
- Confidence level for each (high / medium / low)
- How to validate the most uncertain assumptions
- What would materially change the estimates
Best Practices
- Always provide both top-down and bottom-up estimates to triangulate
- Use web search for current industry data, analyst reports, and market benchmarks
- Cite sources for market data — avoid unsupported numbers
- Be explicit about assumptions; label estimates vs. data
- Distinguish between value-based (revenue) and volume-based (users/units) sizing
- Consider currency and purchasing power parity for international markets
- Flag where estimates have wide confidence intervals
- Recommend specific data sources or research to sharpen estimates
Further Reading
© phuryn, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in pm-market-research/skills/market-sizing of phuryn/pm-skills.
Open the folder on GitHubat commit 8607e3b
Compare with similar skills
Market Sizing next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Market Sizing this skillphuryn/pm-skills | 27k | — | ~1.1k | Automated safety check: Pass | MIT | |
| TAM SAM SOM Calculatordeanpeters/Product-Manager-Skills | 7.2k | 1 repos | ~4.8k | Automated safety check: Pass | Custom licence | |
| Market Sizing Analysisnicepkg/auto-company | 194 | 11 repos | ~3.1k | Automated safety check: Pass | None | |
| Management ConsultantDogInfantry/claude-skill-management-consultant-B1 | 132 | — | ~14k | Automated safety check: Pass | Custom licence | |
| Competitor MapperMaxKmet/idea-validation-agents | 477 | — | ~3.3k | Automated safety check: Pass | MIT | |
| Market Sizing Frameworksslgoodrich/agents | 139 | — | ~3.3k | Automated safety check: Pass | Custom licence |
Similar skills
Market Sizing Analysis
nicepkg/auto-company
This skill should be used when the user asks to "calculate TAM", "determine SAM", "estimate SOM", "size the market", "calculate market opportunity", "what's the total addressable market", or…
Management Consultant
DogInfantry/claude-skill-management-consultant-B1
MBB-level management consultant with mastery over structured thinking, frameworks, guesstimation, industry analysis, and executive-grade deliverables.
Competitor Mapper
MaxKmet/idea-validation-agents
Maps the full competitive landscape — direct, indirect, substitute, and emerging competitors — with positioning gap analysis, review mining, and marketinsights-calibrated saturation scoring.
Market Sizing Frameworks
slgoodrich/agents
TAM/SAM/SOM calculations and market sizing methodologies. An agent skill from slgoodrich/agents.
Market Sizing
AlphaMao1/AlphaMao_Skills
市场规模测算工具 (TAM/SAM/SOM)。适用于用户提到「市场规模」「market size」「TAM」「SAM」「SOM」或需要估算目标市场大小时使用。
More from phuryn/pm-skills
All 67 skills in this repoAgreement-Based Code Review
phuryn/pm-skills
Reviews a diff by anchoring on agreements between two sides of a boundary, forcing a concrete violating execution, and refuting each finding before reporting it.
A/B Test Analysis
phuryn/pm-skills
Validates an experiment's setup, works out lift, p-value and confidence interval from A/B test data, and recommends whether to ship, extend or stop.
Team OKR Brainstorm
phuryn/pm-skills
Drafts three alternative sets of team OKRs, each with an inspiring objective and measurable key results, tied to the company strategy you provide.
Cohort Analysis and Retention Explorer
phuryn/pm-skills
Analyzes uploaded cohort data to compute retention curves and feature adoption trends, builds heatmaps and charts, and suggests qualitative follow-up research.
Dummy Dataset Generator
phuryn/pm-skills
Generates realistic test datasets with custom columns, row counts and business constraints, output as CSV, JSON, SQL inserts or a runnable Python script.
Grammar and Flow Checker
phuryn/pm-skills
Reviews a draft for grammar, logic and flow problems and returns located, prioritized fix suggestions without rewriting the whole text.
Related
Categories
Questions about Market Sizing
What does Market Sizing do?
Estimate market size using TAM, SAM, and SOM with top-down and bottom-up approaches. Market Sizing is an agent skill from phuryn/pm-skills. Estimate market size using TAM, SAM, and SOM with top-down and bottom-up approaches.
When should I use Market Sizing?
Market Sizing fits situations like: sizing a market opportunity; estimating addressable market; preparing for investor pitches; evaluating market entry.
How do I install Market Sizing in Claude Code?
Run `npx skills add phuryn/pm-skills --skill market-sizing -a claude-code`. Or copy the skill folder (pm-market-research/skills/market-sizing in phuryn/pm-skills) into .claude/skills/market-sizing in your project. Claude Code loads it when a task matches its description.
How do I install Market Sizing in Codex?
Run `npx skills add phuryn/pm-skills --skill market-sizing -a codex`. Or copy the skill folder (pm-market-research/skills/market-sizing in phuryn/pm-skills) into .agents/skills/market-sizing in your project. Codex loads it when a task matches its description.
Can I use Market Sizing in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add phuryn/pm-skills --skill market-sizing -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/market-sizing, .gemini/skills/market-sizing, .github/skills/market-sizing and .opencode/skills/market-sizing in your project.
What does Market Sizing need to run?
SKILL.md names no scripts, command-line tools or credentials: Market Sizing is instructions for the agent only.
Does Market Sizing access the network?
SKILL.md names 1 domain. As links in the text: productcompass.pm. This is read from the text; nothing was executed.
Is Market Sizing safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Market Sizing use?
Market Sizing is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Market Sizing use?
About 1.1k tokens (SKILL.md is roughly 4.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Market Sizing?
Skills that share tags, products or a category with Market Sizing: TAM SAM SOM Calculator (deanpeters/Product-Manager-Skills, 7.2k stars), Market Sizing Analysis (nicepkg/auto-company, 194 stars), Management Consultant (DogInfantry/claude-skill-management-consultant-B1, 132 stars) and Competitor Mapper (MaxKmet/idea-validation-agents, 477 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Market Sizing?
phuryn (a GitHub user) maintains it in phuryn/pm-skills, which has 26,845 GitHub stars. The repository holds 67 skills in this directory. The repository was last updated on September 14, 2026.
Source: phuryn/pm-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.