io.github.cyanheads/calculator-mcp-server

io.github.cyanheads/calculator-mcp-server

Evaluate, simplify, and differentiate mathematical expressions.

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Connect this server

Add this to your MCP client config — claude_desktop_config.json (Claude Desktop) or .cursor/mcp.json (Cursor).Suits: Claude Desktop · Cursor.

{
  "mcpServers": {
    "calculator-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/calculator-mcp-server@0.5.3"
      ],
      "env": {
        "CALC_MAX_EXPRESSION_LENGTH": "1000",
        "CALC_EVALUATION_TIMEOUT_MS": "5000",
        "CALC_MAX_RESULT_LENGTH": "100000",
        "MCP_LOG_LEVEL": "info"
      }
    }
  }
}
Environment variables
  • CALC_MAX_EXPRESSION_LENGTHMaximum allowed expression string length.
  • CALC_EVALUATION_TIMEOUT_MSMaximum evaluation time in milliseconds.
  • CALC_MAX_RESULT_LENGTHMaximum result string length in characters.
  • MCP_LOG_LEVELSets the minimum log level for output (e.g., 'debug', 'info', 'warning').

A starting point — check the repository for exact arguments and setup. Restart your client after editing the config.

Category
Developer Tools
Version
0.5.3
Registry
active
Published
10/28/2026

Remotes

  • streamable-httphttps://calculator.caseyjhand.com/mcp

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