Calculator MCP Server

What is Calculator MCP Server 🧮?

Calculator MCP Server 🧮 is a Python-based MCP service that evaluates mathematical expressions safely using Python AST parsing instead of eval. It supports basic arithmetic operations, power operations, and sign handling, with built-in error protection against code injection, division by zero, and invalid expressions.

How to use Calculator MCP Server 🧮?

Install the package via pip install mcp-calculate-server, then create a FastMCP server instance and run it on stdio transport using calculator.run(transport='stdio'). The server exposes a single tool perform_calculation that accepts a string expression and returns the formatted result or an error message.

Key features of Calculator MCP Server 🧮

• Supports addition, subtraction, multiplication, division (+, -, *, /)
• Supports exponentiation (**) and sign operations (+, -)
• Smart formatting: integers shown directly, decimals up to 15 significant digits, trailing zeros removed
• Safe evaluation via Python AST – no code injection risk
• Protection against division by zero, syntax errors, invalid power operations, and illegal operand types

Use cases of Calculator MCP Server 🧮

• Performing safe arithmetic calculations within MCP-based applications
• Evaluating user-supplied expressions without risk of code injection
• Integrating math operations into AI assistants or automation tools
• Providing formatted calculation results with clear error messages