CalculatorLib

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com.calculatorlib/calculatorsv1.2.0 Domain verified

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

Finance & Payments Utilities

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{
  "_meta": {
    "io.modelcontextprotocol.registry/official": {
      "status": "active",
      "isLatest": true,
      "updatedAt": "2026-11-09T17:40:22.996975Z",
      "publishedAt": "2026-11-09T17:40:22.996975Z",
      "statusChangedAt": "2026-11-09T17:40:22.996975Z"
    }
  },
  "server": {
    "name": "com.calculatorlib/calculators",
    "icons": [
      {
        "src": "https://calculatorlib.com/static/android-chrome-512x512.png",
        "sizes": [
          "512x512"
        ],
        "mimeType": "image/png"
      }
    ],
    "title": "CalculatorLib",
    "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
    "remotes": [
      {
        "url": "https://calculatorlib.com/mcp",
        "type": "streamable-http"
      }
    ],
    "version": "1.2.0",
    "websiteUrl": "https://calculatorlib.com/mcp/docs",
    "description": "Year-correct, cited payroll and tax numbers for Asia (Vietnam first) plus ~8,000 calculators."
  }
}

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Call this server's tools from your browser. Nothing to install.

https://calculatorlib.com/mcp

Requests go through mcptry because browsers can't call most MCP servers directly. Header values are sent to the server for that request only and are never stored or logged.

Tool list from our last check. Connect live to refresh it.

convert_units Read-only

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"}.

tostring, required

Target unit (name or symbol).

fromstring, required

Source unit (name or symbol).

valuenumber, required

Numeric value to convert.

categorystring

Unit category, e.g. length, mass, temperature, area, volume, speed. Optional when from/to belong to only one category; an unknown category returns the list of all 67.

Try it

Call this server's tools from your browser. Nothing to install.

https://calculatorlib.com/mcp

Requests go through mcptry because browsers can't call most MCP servers directly. Header values are sent to the server for that request only and are never stored or logged.

Tool list from our last check. Connect live to refresh it.

convert_units Read-only

tostring, required

Target unit (name or symbol).

fromstring, required

Source unit (name or symbol).

valuenumber, required

Numeric value to convert.

categorystring

Unit category, e.g. length, mass, temperature, area, volume, speed. Optional when from/to belong to only one category; an unknown category returns the list of all 67.

Tools (5)

convert_units

read-only

Argument	Type	Description
to*	string	Target unit (name or symbol).
from*	string	Source unit (name or symbol).
value*	number	Numeric value to convert.
category	string	Unit category, e.g. length, mass, temperature, area, volume, speed. Optional when from/to belong to only one category; an unknown category returns the list of all 67.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "value",
    "from",
    "to"
  ],
  "properties": {
    "to": {
      "type": "string",
      "description": "Target unit (name or symbol)."
    },
    "from": {
      "type": "string",
      "description": "Source unit (name or symbol)."
    },
    "value": {
      "type": "number",
      "description": "Numeric value to convert."
    },
    "category": {
      "type": "string",
      "description": "Unit category, e.g. length, mass, temperature, area, volume, speed. Optional when from/to belong to only one category; an unknown category returns the list of all 67."
    }
  },
  "additionalProperties": false
}

get_calculator_schema

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

read-only

Argument	Type	Description
lang	string	Optional language for labels, titles and number formatting: en, es, vi, hi, ja, ko, tr, ar, ru, fr, zh, tw, pt, de (zh = Simplified, tw = Traditional Chinese; zh-CN / zh-TW / vi-VN style tags are accepted). Default: en.
name*	string	Tool name from search_calculators, e.g. bmi_calculator.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "name"
  ],
  "properties": {
    "lang": {
      "type": "string",
      "description": "Optional language for labels, titles and number formatting: en, es, vi, hi, ja, ko, tr, ar, ru, fr, zh, tw, pt, de (zh = Simplified, tw = Traditional Chinese; zh-CN / zh-TW / vi-VN style tags are accepted). Default: en."
    },
    "name": {
      "type": "string",
      "description": "Tool name from search_calculators, e.g. bmi_calculator."
    }
  },
  "additionalProperties": false
}

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}}.

read-only

Argument	Type	Description
args*	object	Input fields for the calculator (from the search result's inputSchema or get_calculator_schema).
lang	string	Optional language for labels, titles and number formatting: en, es, vi, hi, ja, ko, tr, ar, ru, fr, zh, tw, pt, de (zh = Simplified, tw = Traditional Chinese; zh-CN / zh-TW / vi-VN style tags are accepted). Default: en.
name*	string	Tool name from search_calculators, e.g. compound_interest_calculator.
timezone	string	Optional IANA time zone of the user (e.g. Asia/Seoul, America/New_York) or offset (+09:00): date calculators count "today" in it. Default: the time zone of the lang's country (en = America/New_York).

Input schema (JSON)

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".

read-only

Argument	Type	Description
lang	string	Optional language to search in and to return titles and labels in: en, es, vi, hi, ja, ko, tr, ar, ru, fr, zh, tw, pt, de (zh = Simplified, tw = Traditional Chinese; zh-CN / zh-TW / vi-VN style tags are accepted). Default: auto-detected from the query, so titles may come back in the query's language (e.g. vi, es, fr, ja) rather than English; pass lang (e.g. "en") to fix the language.
limit	number	Max results to return (default 8, max 25).
query*	string	Keywords describing the calculation you need.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "query"
  ],
  "properties": {
    "lang": {
      "type": "string",
      "description": "Optional language to search in and to return titles and labels in: en, es, vi, hi, ja, ko, tr, ar, ru, fr, zh, tw, pt, de (zh = Simplified, tw = Traditional Chinese; zh-CN / zh-TW / vi-VN style tags are accepted). Default: auto-detected from the query, so titles may come back in the query's language (e.g. vi, es, fr, ja) rather than English; pass lang (e.g. \"en\") to fix the language."
    },
    "limit": {
      "type": "number",
      "description": "Max results to return (default 8, max 25)."
    },
    "query": {
      "type": "string",
      "description": "Keywords describing the calculation you need."
    }
  },
  "additionalProperties": false
}

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.

read-only

Argument	Type	Description
lang	string	Step language, default en
type	string
problem*	string	LaTeX or text, ≤300 chars, e.g. x^2-5x+6=0

Input schema (JSON)

{
  "type": "object",
  "required": [
    "problem"
  ],
  "properties": {
    "lang": {
      "type": "string",
      "description": "Step language, default en"
    },
    "type": {
      "enum": [
        "auto",
        "equation",
        "derivative",
        "integral",
        "limit",
        "simplify",
        "trigonometry"
      ],
      "type": "string"
    },
    "problem": {
      "type": "string",
      "description": "LaTeX or text, ≤300 chars, e.g. x^2-5x+6=0"
    }
  },
  "additionalProperties": false
}

CalculatorLib

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convert_units Read-only

CalculatorLib

Registry entry

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convert_units Read-only

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Tools (5)

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