Estimation Fermi

Quality score: 70/100 · Category: General · Sub-category: general-misc

Use when making quick order-of-magnitude estimates under uncertainty (market sizing, resource planning, feasibility checks), decomposing complex quantities into estimable parts, bounding unknowns with upper/lower limits, sanity-checking strategic assumptions, or when user mentions Fermi estimation, back-of-envelope calculation, order of magnitude, ballpark estimate, triangulation, or needs to assess feasibility before detailed analysis.

What this skill does

Estimation Fermi is a production-ready Claude Code skill (quality score 70/100) in the general-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/estimation-fermi/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when making quick order-of-magnitude estimates under uncertainty (market sizing, resource planning, feasibility checks), decomposing complex quantities into estimable parts, bounding unknowns with upper/lower limits, sanity-checking strategic assumptions, or when user mentions Fermi estimation, back-of-envelope calculation, order of magnitude, ballpark estimate, triangulation, or needs to assess feasibility before detailed analysis.

Who uses this skill

The Estimation Fermi skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It is part of the open ClaudSkills registry, a community-curated catalog of 15,000+ capabilities you can install for Claude Code — the Claude CLI agent.

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/estimation-fermi
curl -L https://claudskills.com/skills/estimation-fermi/SKILL.md \
  -o ~/.claude/skills/estimation-fermi/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/estimation-fermi/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/estimation-fermi/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\estimation-fermi\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

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Part of ClaudSkills — the open registry for Claude Code skills. · What's New · Install guide · About · llms.txt

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