The Calculator MCP server,
connected in one click.
Calculators accessible via MCP with real-time collaborative sessions and shareable URLs. Connect the official Calculator MCP server to Claude, ChatGPT, or Cursor through gate — one gateway URL, no config files, security-checked.
Free to start · No credit card · No hosting needed
Add Calculator to your AI in one minute
Pick your client. Copy, paste, done — or let gate handle sign-ins and policies for you.
claude mcp add --transport http calculator https://mcpcalc.com/api/v1/mcpRun in your terminal, then restart Claude Code.
Calculator · https://mcpcalc.com/api/v1/mcp
What your AI can do with Calculator
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “list_calculators”: List available calculators, optionally filtered by category.”
“Use “get_calculator_schema”: Get the input schema for a specific calculator.”
“Use “calculate”: Run a calculation and get results + prefilled URL.”
“Use “generate_prefilled_url”: Generate a prefilled URL without running calculation.”
How secure is the Calculator MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how Calculator holds up.
Official endpoint
Operated by Calculator (mcpcalc.com) at its documented MCP endpoint — not a third-party mirror or community re-host.
No sign-in needed
This server only exposes public data — no account and no credentials are involved when you connect.
Scanned before it goes live
gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.
Watched for drift
If Calculator adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.
Connected in three steps
Connect your gate
Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.
Pick Calculator
Choose Calculator in the gate directory. No sign-in needed.
Use it anywhere
Calculator's tools are live in every AI client you've connected — with rules and logging built in.
Free to start · No credit card · No hosting needed
The actual tools Calculator exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
list_calculators — List available calculators, optionally filtered by category
get_calculator_schema — Get the input schema for a specific calculator
calculate — Run a calculation and get results + prefilled URL
generate_prefilled_url — Generate a prefilled URL without running calculation
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.
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
+ 2 more tools once connected
Who runs the Calculator MCP server?
The Calculator MCP server at a glance
https://mcpcalc.com/api/v1/mcpQuestions, answered
Is there an official Calculator MCP server?
Yes — Calculator operates its own remote MCP server at mcpcalc.com. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.
How do I connect Calculator to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick Calculator in the directory. No account or sign-in is needed. From then on, Calculator's tools are available in every client you've connected to gate.
Do I need to host anything?
No. Calculator runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the Calculator MCP server safe to connect?
It's the vendor's official endpoint, and gate scans its tools for prompt injection and hidden instructions before it goes live, re-checks it whenever it changes, and lets you allow, block, or require approval for every single tool.
Is it free?
Yes — you can get started with gate for free and connect Calculator in minutes. No credit card required.
Connect more than just Calculator
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up Calculator in: Claude · Claude Code · ChatGPT · Cursor · VS Code