calculator mcp server for ChatGPT

io.github.cyanheads/calculator-mcp-server

Evaluate, simplify, and differentiate mathematical expressions.

client:ChatGPT transport:streamable-http runtime:npm tools:1

Install calculator mcp server in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://calculator.caseyjhand.com/mcp

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs