Calculator MCP Server: Install & Setup

Install Calculator in Claude Code

Claude Code

claude mcp add slettmayer-calculator -- uvx calc-mcp-server

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "slettmayer-calculator": {
      "command": "uvx",
      "args": [
        "calc-mcp-server"
      ]
    }
  }
}

Exact arithmetic: one calculator tool over an AST allowlist, with integers exact at any size.

Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

Run: claude mcp add slettmayer-calculator -- uvx calc-mcp-server

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