Calculator MCP Server

by mcpcalc Your server? Claim it

answering

Calculator is answering right now. Last checked 10 min ago. It exposes 10 tools.

Calculators accessible via MCP with real-time collaborative sessions and shareable URLs.

Uptime history 47 days of history

47 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

795 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check Calculator every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 10 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add calculator --transport http https://mcpcalc.com/api/v1/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "calculator": {
      "url": "https://mcpcalc.com/api/v1/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.calculator]
url = "https://mcpcalc.com/api/v1/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "calculator": {
      "url": "https://mcpcalc.com/api/v1/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "calculator": {
      "url": "https://mcpcalc.com/api/v1/mcp"
    }
  }
}

Available tools 10

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

calculate

calculate

Run a calculation and get results + prefilled URL

calculate_cas

Evaluate one or more headless CAS expressions server-side (MCP-only numeric mode). Unsupported expressions return a GUI handoff link.

calculate_cas_headless

Alias of calculate_cas. Headless MCP-only CAS evaluator; if unsupported features are requested, returns GUI handoff details.

session

create_session

Create a new interactive session for any calculator and return the session URL

get_session_state

Retrieve the current field values, computation transcript, and pending message queue for an active session

calculator

get_calculator_schema

Get the input schema for a specific calculator

calculators

list_calculators

List available calculators, optionally filtered by category

close_session

Close a session and optionally persist a snapshot of its final state

generate

generate_prefilled_url

Generate a prefilled URL without running calculation

push

push_session_action

Push actions into a session's message queue (set fields, submit computation, trigger plot, etc.)

Endpoints

URL	Transport	State	Latency	Checked
https://mcpcalc.com/api/v1/mcp	streamable-http	answering	1061 ms	10 min ago

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Calculator — questions

Answers built from our own checks of this server.

What can Calculator do?

It exposes 10 tools, read directly from the server on our last check. Among them: calculate, calculate_cas, calculate_cas_headless, close_session, create_session, generate_prefilled_url and 4 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

What is Calculator mostly used for?

Its tools cluster around calculate and session. That is what this server is built to work with — the grouping comes from the actual tool names, not from a category we assigned.

Is Calculator working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 795 ms. The bar chart above shows every period we have measured.

How do I connect Calculator?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Calculator need an API key?

No. Calculator completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 10 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Calculator?

It answers our handshake in 795 ms on average, which is faster than 14% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.