The Calcgrid MCP server,
connected in one click.
China working-day data, UK bank holidays, IANA time zones and deterministic business deadlines. Connect the official Calcgrid 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 Calcgrid 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 calcgrid https://tttkmbb.com/mcpRun in your terminal, then restart Claude Code.
Calcgrid · https://tttkmbb.com/mcp
What your AI can do with Calcgrid
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “search_calculators”: Use this when a user needs a deterministic calculation but none of the dedicated tools clearly matches and the calculator_id is unknown. Sea.”
“Use “list_calculators”: List all calculators, optionally filtered by category id (finance, health, fitness, math, geometry, statistics, conversion, physics, chemist.”
“Use “list_calculator_categories”: List the calculator categories with id, name, description and calculator count. Use it to orient before list_calculators. Does not perform c.”
“Use “get_calculator_schema”: Use this only after search_calculators when its input_hints do not resolve a range, enum or optional-field question. Return the full input/o.”
How secure is the Calcgrid MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how Calcgrid holds up.
Security grade F
gate scanned 253 tools on Oct 14, 2026 for prompt injection and risky tool definitions — nothing to flag.
- lowcalculate_business_deadline: Unusually long tool description
- lowcount_china_working_days: Unusually long tool description
- lowadd_uk_working_days: Unusually long tool description
- +18 more in the full report
Official endpoint
Operated by Calcgrid (tttkmbb.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 Calcgrid 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 Calcgrid
Choose Calcgrid in the gate directory. No sign-in needed.
Use it anywhere
Calcgrid'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 Calcgrid exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
search_calculators — Use this when a user needs a deterministic calculation but none of the dedicated tools clearly matches and the calculator_id is unknown. Sea
list_calculators — List all calculators, optionally filtered by category id (finance, health, fitness, math, geometry, statistics, conversion, physics, chemist
list_calculator_categories — List the calculator categories with id, name, description and calculator count. Use it to orient before list_calculators. Does not perform c
get_calculator_schema — Use this only after search_calculators when its input_hints do not resolve a range, enum or optional-field question. Return the full input/o
run_calculator — Use this when the user needs one of Calcgrid's 535 deterministic calculators and no dedicated typed tool covers it. Call it immediately afte
convert_units — Use this when the user asks to convert a numeric value between units of the same physical quantity: length, mass, temperature, area, volume,
list_units — List every unit symbol supported by convert_units, grouped by quantity, with names. Use it when a unit symbol is rejected with UNKNOWN_UNIT.
check_china_working_day — Use this when you need to know whether a specific 2024-2026 date is a working day in mainland China, especially around Spring Festival, Nati
+ 245 more tools once connected
Who runs the Calcgrid MCP server?
The Calcgrid MCP server at a glance
https://tttkmbb.com/mcpQuestions, answered
Is there an official Calcgrid MCP server?
Yes — Calcgrid operates its own remote MCP server at tttkmbb.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 Calcgrid to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick Calcgrid in the directory. No account or sign-in is needed. From then on, Calcgrid's tools are available in every client you've connected to gate.
Do I need to host anything?
No. Calcgrid runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the Calcgrid 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 Calcgrid in minutes. No credit card required.
Connect more than just Calcgrid
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up Calcgrid in: Claude · Claude Code · ChatGPT · Cursor · VS Code