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MCP Calculator

by devantage
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Python
Hybrid

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MCP Calculator

A modern Model Context Protocol server for mathematical calculations. Exposes 13 tools (6 core + 7 specialized) with high-precision arithmetic, a safe expression evaluator, statistics, unit conversion, and financial math.

Requirements

  • Python 3.10+

  • uv (or Docker, for the containerized setup)

Installation

uv venv

uv pip install -e ".[dev]"

Running

The server supports two transports, selected via the MCP_TRANSPORT environment variable (see Configuration).

STDIO

The server speaks MCP over stdio by default (the transport used by most MCP clients such as Claude Desktop and Claude Code):

source .venv/bin/activate

mcp-calculator

Streamable HTTP

To serve over streamable HTTP instead:

source .venv/bin/activate

MCP_TRANSPORT=http mcp-calculator

The HTTP endpoint is then available at http://0.0.0.0:8080/mcp/.

Docker

Build the image and run it in HTTP mode (the image defaults to HTTP on port 8080):

docker build -t mcp-calculator .

docker run --rm -p 8080:8080 mcp-calculator

Override any setting at runtime with -e, e.g. a different port:

docker run --rm -p 9000:9000 -e MCP_PORT=9000 mcp-calculator

Configuration

Variable

Default

Description

MCP_TRANSPORT

stdio

Transport to use: stdio or http (streamable HTTP).

MCP_HOST

0.0.0.0

Host/interface to bind when using HTTP. Use 0.0.0.0 to expose it.

MCP_PORT

8080

Port to listen on when using HTTP.

Available Tools

Core

Tool

Description

basic_math

add / subtract / multiply / divide with decimal precision (0-15)

advanced_math

trig, inverse trig, log/ln, sqrt, abs, factorial, exp, pow

expression_eval

evaluate expressions with variables, constants, and functions

statistics_analysis

mean, median, mode, std_dev, variance, percentile, range, skewness, kurtosis, summary

unit_conversion

length, weight, temperature, volume, area

financial_calc

simple/compound interest, loan payment, ROI, present/future value

Specialized

Tool

Description

stats_summary

full statistical overview of a dataset

percentile

a specific percentile (0-100) of a dataset

batch_conversion

convert many values between units at once

npv

Net Present Value of cash flows

irr

Internal Rate of Return (Newton-Raphson)

loan_comparison

compare loans, return the lowest monthly payment

investment_scenarios

compare investments, return the highest return

Development

Testing

Run the test suite with:

pytest

License

MIT

This server cannot be installed

-
license - not tested
-
quality - not tested
B
maintenance

How are these scores calculated?

Maintenance

–Maintainers
–Response time
–Release cycle
1Releases (12mo)
Commit activity

Resources

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