# CalculatorLib Muse connector

From musedirectory.ai, the independent directory of Meta Muse connectors. Not affiliated with Meta.

## CalculatorLib

Run payroll, tax, health, math and unit calculators with cited results.

- Record: https://musedirectory.ai/connector/calculatorlib
- Category: Productivity
- Developer: CalculatorLib (https://calculatorlib.com/mcp/docs)
- Muse status: Extra setup. Not in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
- Health: Working, 63ms, checked 2026-11-09T18:31:30Z
- Endpoint: https://calculatorlib.com/mcp
- Auth: No account needed; Pricing: unknown
- Screening: Screened, no issues found (2026-11-09T18:31:30Z)
- Source: Found in the official MCP Registry (com.calculatorlib/calculators) https://registry.modelcontextprotocol.io/v0/servers?search=com.calculatorlib%2Fcalculators

Connects Muse to about 8,000 calculators, including year-correct payroll and tax tools for Asian markets and general calculators for mortgage, BMI, unit conversion and math. Muse can search, run and cite results.

Example request: "Calculate my monthly mortgage payment and show the formula."

How to connect: Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use CalculatorLib to help me. It is a free service with an MCP server at https://calculatorlib.com/mcp. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.

Tools:
- 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 s
- 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, effectiv
- 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 li
- 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.

Screening checks:
- MCP handshake: pass (Answered in 63ms)
- Domain against threat feeds (Cloudflare security DNS): pass (calculatorlib.com not flagged)
- Published packages against the OSV malicious-package database: n/a (No npm or PyPI package published)
- Hidden instructions or invisible characters in tool text: pass (5 tools read, nothing found)
- Inputs asking for passwords, card numbers or seed phrases: pass (None found)
- Domain and redirects: pass (No redirects off the domain)
- AI review of purpose and tool behavior: pass (No concerns)