CalculatorLib MCP Server

by calculatorlib Your server? Claim it

answering

CalculatorLib is answering right now. Last checked 12 min ago. It exposes 5 tools.

Year-correct, cited payroll and tax numbers for Asia (Vietnam first) plus ~8,000 calculators.

Uptime history 43 hours of history

43 hours agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

144 ms

Response time

average over 24h

open, no key

Access

streamable-http

What changed 2

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 11 November 2026. No other catalogue keeps this.

11 Nov a tool changed the parameters it asks for solve_math

10 Nov a tool changed the parameters it asks for solve_math

Nothing serious here today

Today is the operative word: we check CalculatorLib 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 12 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add calculators --transport http https://calculatorlib.com/mcp

Settings → Connectors → Add custom connector, then paste this address

https://calculatorlib.com/mcp

~/.codex/config.toml

[mcp_servers.calculators]
url = "https://calculatorlib.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "calculators": {
      "url": "https://calculatorlib.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "calculators": {
      "type": "http",
      "url": "https://calculatorlib.com/mcp"
    }
  }
}

Available tools 5

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

calculator

get_calculator_schema

Full input schema (field names, types, units, options) of one calculator. Optional: search_calculators already returns a compact schema per hit.

run_calculator

Run a calculator and get the result. Pass the calculator's name (from search_calculators) and its input fields in args. Returns the computed values plus a share link to the calculator page with inputs pre-filled; calculators backed by a legal edition also return edition, effective_from and sources[] (document, article/clause, URL) to cite. Missing inputs are refused (isError), never defaulted. When the calculator has a formula, the result ALSO includes formula_latex — the formula with the user's values substituted; show it to the user (rendered as LaTeX when your client supports it, otherwise inline as text). Example: {"name":"bmi_calculator","args":{"unitSystem":"metric","weight":70,"height":175}}.

calculators

search_calculators

Search CalculatorLib by keyword in any of its 12 languages — payroll, tax and social-insurance calculators for Asian markets (year-correct, legal editions cited where available) and about 8,000 general calculators. Returns the best matches (name, title, and a ready-to-use input schema) ranked by relevance and popularity. Call this FIRST, then call run_calculator with the chosen name. Example queries: "Vietnam personal income tax", "lương gross sang net", "mortgage monthly payment", "body mass index".

convert

convert_units

Convert a value between units of one category (length, mass, temperature, area, volume, speed, data and 60 more). Names, symbols and common spellings work ("m", "ft", "lbs", "°C"). category is optional when the two units identify it; an unknown unit returns the category's unit list. Example: {"value":10,"from":"Meter","to":"Foot"}.

solve

solve_math

Solve algebra, trigonometry or calculus step by step (equations, systems, derivatives, integrals, limits, simplify/factor). Answers are checked numerically; unverifiable problems are refused. Returns LaTeX + plain answer, steps, checks, page link.

Endpoints

URL	Transport	State	Latency	Checked
https://calculatorlib.com/mcp	streamable-http	answering	151 ms	12 min ago

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CalculatorLib — questions

Answers built from our own checks of this server.

What can CalculatorLib do?

It exposes 5 tools, read directly from the server on our last check. Among them: convert_units, get_calculator_schema, run_calculator, search_calculators, solve_math. 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 →

Is CalculatorLib 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 144 ms. The bar chart above shows every period we have measured.

How do I connect CalculatorLib?

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

Does CalculatorLib need an API key?

No. CalculatorLib completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 5 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is CalculatorLib?

It answers our handshake in 144 ms on average, which is faster than 85% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.