Calc

Verified Integration

Author: @providing•Category: ServerApplication

GitHub Repository

JSON-RPC 2.0

Protocol Standard

Sub-second

Execution Latency

Active

Operational Status

Client Configuration

— Connect Calc to Claude Desktop or Cursor in seconds

{
  "mcpServers": {
    "calc": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-calc"
      ],
      "env": {}
    }
  }
}

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows).

Architecture & Capabilities

System Overview

Enhance large language models with 21 deterministic tools for accurate math, cryptographic randomness, date arithmetic, encoding, hashing, and more.

Indexed Date

7/22/2026

License

Open Source

Protocol Layer

stdio / SSE RPC

Frequently Asked Questions

Architecture and operational details for Calc

Calc handles a wide range of deterministic tasks including complex mathematical and statistical operations, generating cryptographically secure UUIDs and passwords, accurate date and time arithmetic with timezone conversions, text encoding/decoding (Base64, URL, HTML), various cryptographic hashing (MD5, SHA), and unit/color format conversions.

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