Calculator MCP Server

What is Calculator MCP Server about?

Calculator MCP Server provides a lightweight MCP server that exposes a calculate tool. LLMs can call this tool to evaluate arithmetic or mathematical expressions, ensuring accurate numeric results instead of relying on approximate reasoning.

How to use Calculator MCP Server?

1. Installation
   • Preferred: install via uv (no extra step, run with uvx).
   • Alternative: pip install mcp-server-calculator and execute python -m mcp_server_calculator.
2. Client configuration
   • For uv:

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

   • For pip:

   "mcpServers": {
     "calculator": {
       "command": "python",
       "args": ["-m", "mcp_server_calculator"]
     }
   }
   

3. Invoke the calculate tool from an LLM prompt by supplying the expression string.

Key features of Calculator MCP Server

• Single built‑in tool: calculate for evaluating any valid expression.
• Minimal setup; works out‑of‑the‑box with uvx or pip.
• MIT‑licensed, easy to modify or extend.
• Designed for seamless integration with any MCP‑compatible client.

Use cases of Calculator MCP Server

• Financial calculations (interest, amortization, tax).
• Scientific computations within chat interactions.
• Data validation where exact numeric results are required.
• Assisting code generation tools that need arithmetic evaluation.

FAQ from the Calculator MCP Server

Q: Which package manager is recommended? A: uv is recommended for its speed and direct uvx execution.

Q: Can I run the server on Windows? A: Yes, both uvx and the pip‑based command work on Windows.

Q: Is there a way to secure the server with an API key? A: The server does not require authentication by default, but you can wrap the command in a script that checks environment variables before launching.

Q: What expressions are supported? A: Any expression parsable by Python's eval under a safe sandbox is accepted (basic arithmetic, math functions, etc.).

Calculator MCP Server

A Model Context Protocol server for calculating. This server enables LLMs to use calculator for precise numerical calculations.

Available Tools

• calculate - Calculates/evaluates the given expression.
  • expression (string, required): Expression to be calculated

Installation

Using uv (recommended)

When using uv no specific installation is needed. We will use uvx to directly run mcp-server-calculator.

curl -LsSf https://astral.sh/uv/install.sh | sh

Using PIP

Alternatively you can install mcp-server-calculator via pip:

pip install mcp-server-calculator

After installation, you can run it as a script using:

python -m mcp_server_calculator

Configuration

Using uv (recommended)

Add this to your MCP client settings:

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

Using PIP

Alternatively add this to your MCP client settings:

"mcpServers": {
  "calculator": {
    "command": "python",
    "args": ["-m", "mcp_server_calculator"]
  }
}

License

mcp-server-calculator is licensed under the MIT License. This means you are free to use, modify, and distribute the software, subject to the terms and conditions of the MIT License. For more details, please see the LICENSE file in the project repository.