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Calc MCP server

by coo-quack·io.github.coo-quack/calc-mcp·v2.1.5·9 stars
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21 MCP tools for math, randomness, dates, encoding, hashing, and more — deterministic and accurate.

B83/100grade B
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Safety scan
B83/100

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Adoption
Growing

9 stars267 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

Calc tools

No tool declarations could be read from the package source. They show once the server is installed.

Not scanned yet. New listings are scanned within a day or two of arriving.

How Calc compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
83/100
higher than 65% of 48,243 servers
GitHub stars
9
more than 87% of 28,706 servers
Downloads a week
267
more than 79% of 12,306 servers with a package

Release history: 5 versions in the registry since 2026-09-13, latest 2026-10-24, typically one every 13 days.

Install Calc in Claude Code, Cursor or VS Code

Runs npx -y @coo-quack/calc-mcp on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add calc-mcp -- npx -y @coo-quack/calc-mcp
Add to Cursor

What the publisher says

From the Calc repository's README, as published. We do not edit it. Read it on GitHub

Calc MCP

📖 Documentation — Full tool reference, examples, and install guides.

21 tools for things AI is not good at — deterministic math, cryptographic randomness, accurate date arithmetic, encoding, hashing, and more.

LLMs hallucinate calculations, can't generate true random numbers, and struggle with timezones. This MCP server fixes that.

Quick Start

# Claude Code
claude mcp add -s user calc-mcp -- npx -y @coo-quack/calc-mcp@2.1.1

# Or just run it
npx -y @coo-quack/calc-mcp@2.1.1

Works with Claude Desktop, VS Code Copilot, Cursor, Windsurf, and any MCP client — setup guides below.

Why?

  • Deterministic — Same input, same correct output, every time
  • Secure — Sandboxed math, ReDoS protection, weak hash warnings
  • Private — All computation runs locally, no data sent to external services
  • No server config — Install once via npx; MCP client setup required
  • No API key — No account or API key required for calc-mcp itself; requires Node.js

Examples

Ask in natural language — your AI assistant selects the appropriate tool.

Math & Numbers

Text & Encoding

Date & Time

Generation

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Calc: common questions

Is Calc MCP server safe?
Mostly: it is graded B (83/100). Read the Calc safety report
How do I install Calc?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Calc need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Calc maintained?
The last commit was 33 days ago (2026-10-03). The latest release is v2.1.5.
How does Calc compare with other MCP servers?
safety score 83/100 (higher than 65% of 48,243 servers); github stars 9 (more than 87% of 28,706 servers); downloads a week 267 (more than 79% of 12,306 servers with a package). Full comparison.