Market Sizing Analysis
wshobson/agents
Calculate TAM/SAM/SOM for market opportunities using top-down, bottom-up, and value theory methodologies.
Calculates total, serviceable available and serviceable obtainable market size for a product idea with explicit assumptions, methods and caveats.
Install TAM SAM SOM Calculator
$ npx skills add deanpeters/Product-Manager-Skills --skill tam-sam-som-calculator -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install deanpeters/Product-Manager-Skills tam-sam-som-calculator --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/deanpeters/Product-Manager-Skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/tam-sam-som-calculator .claude/skills/tam-sam-som-calculator && 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 "tam-sam-som-calculator" agent skill from https://github.com/deanpeters/Product-Manager-Skills/tree/main/skills/tam-sam-som-calculator into .claude/skills/tam-sam-som-calculator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tam-sam-som-calculator", 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/deanpeters/Product-Manager-Skills/tree/main/skills/tam-sam-som-calculatorType 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 deanpeters/Product-Manager-Skills --skill tam-sam-som-calculator -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install deanpeters/Product-Manager-Skills tam-sam-som-calculator --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/deanpeters/Product-Manager-Skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/tam-sam-som-calculator .agents/skills/tam-sam-som-calculator && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "tam-sam-som-calculator" agent skill from https://github.com/deanpeters/Product-Manager-Skills/tree/main/skills/tam-sam-som-calculator into .agents/skills/tam-sam-som-calculator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tam-sam-som-calculator", 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 deanpeters/Product-Manager-Skills --skill tam-sam-som-calculator -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install deanpeters/Product-Manager-Skills tam-sam-som-calculator --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/deanpeters/Product-Manager-Skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/tam-sam-som-calculator .cursor/skills/tam-sam-som-calculator && 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 "tam-sam-som-calculator" agent skill from https://github.com/deanpeters/Product-Manager-Skills/tree/main/skills/tam-sam-som-calculator into .cursor/skills/tam-sam-som-calculator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tam-sam-som-calculator", 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/deanpeters/Product-Manager-Skills.git --path skills/tam-sam-som-calculator--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 deanpeters/Product-Manager-Skills --skill tam-sam-som-calculator -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install deanpeters/Product-Manager-Skills tam-sam-som-calculator --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/deanpeters/Product-Manager-Skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/tam-sam-som-calculator .gemini/skills/tam-sam-som-calculator && 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 "tam-sam-som-calculator" agent skill from https://github.com/deanpeters/Product-Manager-Skills/tree/main/skills/tam-sam-som-calculator into .gemini/skills/tam-sam-som-calculator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tam-sam-som-calculator", 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 deanpeters/Product-Manager-Skills tam-sam-som-calculatorInstalls 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 deanpeters/Product-Manager-Skills --skill tam-sam-som-calculator -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/deanpeters/Product-Manager-Skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/tam-sam-som-calculator .github/skills/tam-sam-som-calculator && 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 "tam-sam-som-calculator" agent skill from https://github.com/deanpeters/Product-Manager-Skills/tree/main/skills/tam-sam-som-calculator into .github/skills/tam-sam-som-calculator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tam-sam-som-calculator", 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 deanpeters/Product-Manager-Skills --skill tam-sam-som-calculator -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install deanpeters/Product-Manager-Skills tam-sam-som-calculator --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/deanpeters/Product-Manager-Skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/tam-sam-som-calculator .opencode/skills/tam-sam-som-calculator && 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 "tam-sam-som-calculator" agent skill from https://github.com/deanpeters/Product-Manager-Skills/tree/main/skills/tam-sam-som-calculator into .opencode/skills/tam-sam-som-calculator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tam-sam-som-calculator", 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
tam-sam-som-calculator- GitHub stars
- 7.2k
- Used in
- 1 other repo
- Token cost
- ~4.8k tokens
- SKILL.md length
- 1,760 words
- Files
- 4 (incl. scripts)
- Skills in repo
- 75
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Calculates total, serviceable available and serviceable obtainable market size for a product idea with explicit assumptions, methods and caveats.
- Works in 3 steps: Bring your own numbers — you have… → Guided interview — up to 4 adaptive… → Autonomous research — the agent builds a…
- Sizing the market for a new product idea
- SKILL.md covers Purpose, Input, Key Concepts and Application, plus 3 more sections
- Runs Python scripts from its folder; calls python3
What it does
The skill guides product managers through sizing a market for a product idea and produces a structured, citation-backed estimate for investor pitches, budget requests or a check on product-market fit, rather than a back-of-the-envelope guess. It explains the three tiers: TAM is total demand with no constraints, SAM is the part of it your company can realistically reach given geography, firmographics, demographics or product limits, and SOM is the share you can actually obtain.
There are three entry modes. With your own numbers, such as population and ARPU figures, the helper script market-sizing.py does the math deterministically. A guided interview builds the inputs with up to 4 adaptive questions and is the default. In autonomous research mode the agent builds a bottom-up estimate from government statistics and filings while you review the evidence. Anything passed with the invocation counts as already answered, and you can start with nothing and be asked what you are sizing and for whom.
A template.md and an examples/sample.md ship with the skill. Its sample invocations include an AI scheduling assistant for independent dental practices and field-service dispatch software in the DACH region.
When your agent uses it
- Sizing the market for a new product idea
- Preparing the market-size slide for investors or an executive review
- Backing a business case with sourced assumptions
Example prompts
- “Size the market for an AI scheduling assistant for independent dental practices, US only.”
- “Research-mode market sizing for field-service dispatch software in the DACH region. I have no numbers yet.”
- “I have population figures and an ARPU for dentists in Germany. Run the TAM SAM SOM math.”
Requirements
- Python, to run the bundled market-sizing script
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- Bring your own numbers — you have population and ARPU figures; jump to the math (the helper script makes this deterministic)
- Guided interview — up to 4 adaptive questions build the inputs with you (the default flow below)
- Autonomous research — the agent builds a bottom-up, citation-backed estimate from government statistics and filings while you review the…
What it can do on your machine
Read from SKILL.md and the folder at commit 1b5a524. 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
Ships 1 file in scripts/ (Python), which the agent can run.
Shell commands in SKILL.md call:
python3
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
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
TAM SAM SOM Calculator loads about 4.8k tokens when it runs. Until then it costs about 45 tokens; SKILL.md has 1,760 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); the scripts in this folder are not scanned.
SKILL.md
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 1,760 words (~4,753 tokens).
“Guide product managers through calculating Total Addressable Market (TAM), Serviceable Available Market (SAM), and Serviceable Obtainable Market (SOM) for a product idea by asking adaptive, contextually relevant questions. Use this to build defensible market size estimates backed by real-world citations…”
- name
- tam-sam-som-calculator
- argument-hint
- [product idea] [market constraints]
- intent
- Guide product managers through calculating Total Addressable Market (TAM), Serviceable Available Market (SAM), and Serviceable Obtainable Market (SOM) for a…
- type
- interactive
- theme
- market-intelligence
- best_for
- Sizing a market for a business case an executive will question, Making your market assumptions explicit and attackable, Replacing a top-down guess with a…
- scenarios
- I need market sizing for a business case our CFO will pick apart, Our TAM number came from a slide nobody can source — rebuild it properly
- estimated_time
- 20-40 min
Files
SKILL.md and 3 other files (scripts) in skills/tam-sam-som-calculator of deanpeters/Product-Manager-Skills.
- SKILL.md
- examples/sample.md
- scripts/market-sizing.py
- template.md
Open the folder on GitHubat commit 1b5a524
Used in 1 other repository
We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in deanpeters/Product-Manager-Skills, which our catalogue first saw on October 7, 2026.
Compare with similar skills
TAM SAM SOM Calculator 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 |
|---|---|---|---|---|---|---|
| TAM SAM SOM Calculator this skilldeanpeters/Product-Manager-Skills | 7.2k | 1 repos | ~4.8k | Automated safety check: Pass | Custom licence | |
| Market Sizing Analysiswshobson/agents | 40k | 1 repos | ~620 | Automated safety check: Pass | MIT | |
| Startup Business Analyst Market Opportunityaiskillstore/marketplace | 433 | 7 repos | ~1.8k | Automated safety check: Notes | None | |
| Market AnalyzerMathews-Tom/armory | 329 | — | ~2.4k | Automated safety check: Pass | MIT | |
| Market Sizing Analysisnicepkg/auto-company | 195 | 11 repos | ~3.1k | Automated safety check: Pass | None | |
| Market Sizing Frameworksslgoodrich/agents | 139 | — | ~3.3k | Automated safety check: Pass | Custom licence |
Similar skills
Startup Business Analyst Market Opportunity
aiskillstore/marketplace
Generate comprehensive market opportunity analysis with TAM/SAM/SOM calculations
Market Analyzer
Mathews-Tom/armory
Structured market analysis with TAM/SAM/SOM sizing, trends, and competitive landscape via WebSearch, producing investor-grade cited reports.
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…
Market Sizing Frameworks
slgoodrich/agents
TAM/SAM/SOM calculations and market sizing methodologies. An agent skill from slgoodrich/agents.
Startup Analyst
aiskillstore/marketplace
Expert startup business analyst specializing in market sizing, financial modeling, competitive analysis, and strategic planning for early-stage companies.
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Related
Questions about TAM SAM SOM Calculator
What does TAM SAM SOM Calculator do?
Calculates total, serviceable available and serviceable obtainable market size for a product idea with explicit assumptions, methods and caveats. The skill guides product managers through sizing a market for a product idea and produces a structured, citation-backed estimate for investor pitches, budget requests or a check on product-market fit, rather than a back-of-the-envelope guess. It explains the three tiers: TAM is total demand with no constraints, SAM is the part of it your company can realistically reach given geography, firmographics, demographics or product limits, and SOM is the share you can actually obtain.
When should I use TAM SAM SOM Calculator?
TAM SAM SOM Calculator fits situations like: sizing the market for a new product idea; preparing the market-size slide for investors or an executive review; backing a business case with sourced assumptions.
How do I install TAM SAM SOM Calculator in Claude Code?
Run `npx skills add deanpeters/Product-Manager-Skills --skill tam-sam-som-calculator -a claude-code`. Or copy the skill folder (skills/tam-sam-som-calculator in deanpeters/Product-Manager-Skills) into .claude/skills/tam-sam-som-calculator in your project. Claude Code loads it when a task matches its description.
How do I install TAM SAM SOM Calculator in Codex?
Run `npx skills add deanpeters/Product-Manager-Skills --skill tam-sam-som-calculator -a codex`. Or copy the skill folder (skills/tam-sam-som-calculator in deanpeters/Product-Manager-Skills) into .agents/skills/tam-sam-som-calculator in your project. Codex loads it when a task matches its description.
Can I use TAM SAM SOM Calculator 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 deanpeters/Product-Manager-Skills --skill tam-sam-som-calculator -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/tam-sam-som-calculator, .gemini/skills/tam-sam-som-calculator, .github/skills/tam-sam-som-calculator and .opencode/skills/tam-sam-som-calculator in your project.
What does TAM SAM SOM Calculator need to run?
Going by SKILL.md and its folder, TAM SAM SOM Calculator needs Python for the scripts in its folder and the command-line tools its instructions call (python3). Our summary lists: Python, to run the bundled market-sizing script.
Does TAM SAM SOM Calculator access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is TAM SAM SOM Calculator 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does TAM SAM SOM Calculator use?
TAM SAM SOM Calculator has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does TAM SAM SOM Calculator use?
About 4.8k tokens (SKILL.md is roughly 19k 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 TAM SAM SOM Calculator?
Skills that share tags, products or a category with TAM SAM SOM Calculator: Market Sizing Analysis (wshobson/agents, 40k stars), Startup Business Analyst Market Opportunity (aiskillstore/marketplace, 433 stars), Market Analyzer (Mathews-Tom/armory, 329 stars) and Market Sizing Analysis (nicepkg/auto-company, 195 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains TAM SAM SOM Calculator?
deanpeters (a GitHub user) maintains it in deanpeters/Product-Manager-Skills, which has 7,224 GitHub stars. The repository holds 75 skills in this directory. The repository was last updated on September 1, 2026.
Source: deanpeters/Product-Manager-Skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.