MCP server

All 175 calculators of onlinecalculator.me, callable by AI agents. Free, no auth, no data stored.

Endpoint

https://onlinecalculator.me/mcp   (MCP Streamable HTTP)

Connect

• Claude Code: claude mcp add --transport http calc https://onlinecalculator.me/mcp
• claude.ai: Settings → Connectors → Add custom connector → paste the URL
• Other clients (Cursor, etc.): add a remote HTTP MCP server with the same URL

Tools

• list_calculators — browse or search all 175 by category or keyword
• describe_calculator — input fields, conventions, and a ready example for one id
• calculate — run it; returns the full result plus a link to the web version pre-filled with your numbers

Try it

curl -X POST https://onlinecalculator.me/mcp \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{
    "name":"calculate","arguments":{"id":"tip","inputs":{"bill":120,"tipPct":20,"numPeople":3}}}}'

Same math everywhere

The server runs the exact TypeScript modules behind the website and the native app (iPhone/iPad/Mac, Android) — every formula covered by unit tests with cited sources. Machine-readable site index: llms.txt.