Calcgrid

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How to connect

Add it to any MCP client that supports remote servers.

{
  "mcpServers": {
    "calcgrid": {
      "type": "http",
      "url": "https://tttkmbb.com/mcp"
    }
  }
}

253 tools

• 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. Search 737 calculators from the complete task in English or Chinese, then call run_calculator with the top matching calculator_id and returned…

• list_calculators

  List all calculators, optionally filtered by category id (finance, health, fitness, math, geometry, statistics, conversion, physics, chemistry, everyday, food, construction, business, time, medical, engineering, weather, investing, developer, energy, photography, science…

• list_calculator_categories

  List the calculator categories with id, name, description and calculator count. Use it to orient before list_calculators. Does not perform calculations.

• list_working_day_calendars

  Use this before a working-day or business-day task to select the correct evidence package. It distinguishes the worldwide CLDR weekday/weekend baseline, the broad source-labelled OpenWorkdays national-scope reference, the clearly labelled OpenHolidays nationwide public-holiday…

• 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/output schema, formula, sources, examples and limitations for one calculator. Do not call it when the search result already supplies enough…

• run_calculator

  Use this when the user needs one of Calcgrid's 737 deterministic calculators and no dedicated typed tool covers it. Call it immediately after search_calculators once calculator_id and input_hints are known; do not stop at search or schema discovery. Do not use it for trivial…

• 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, speed, time, data, energy, pressure, power, angle, fuel economy, force, frequency, density or torque. Unit symbols and common names are…

• 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. Does not convert anything.

• calculate_business_deadline

  Use this when you need an SLA, support, procurement or order deadline measured in business hours under the published mainland China or UK calendar, and must express the result in another team's IANA time zone with reproducible holiday and DST evidence. Call this tool directly…

• 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, National Day or another adjusted holiday. Call this tool directly and return its calculation instead of answering the formula from memory or…

• add_china_working_days

  Use this when you need a deadline or settlement date a stated number of mainland China national working days before or after a 2024-2026 date. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use…

• count_china_working_days

  Use this when you need the number of official mainland China working days in a 2024-2026 date range for an SLA, payroll, project or delivery estimate. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do…

• check_uk_working_day

  Use this when you need to know whether a 2024-2028 UK date is a Monday-Friday working day after applying the official bank holidays for the selected division. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at…

• add_uk_working_days

  Use this when you need a deadline a stated number of UK working days before or after a 2024-2028 date and the correct division's bank holidays matter. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do…

• count_uk_working_days

  Use this when you need a 2024-2028 UK SLA, payroll, project or delivery-day count and the selected division's bank holidays must be excluded. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use…

• check_global_working_day

  Use this when you need a worldwide weekday/weekend check and have a CLDR alpha-2 territory code, but do not need public-holiday exclusions. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use this…

• add_global_working_days

  Use this when you need a weekday-based date offset for a territory and explicitly want public holidays excluded from the calculation. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use this when a…

• count_global_working_days

  Use this when you need a worldwide weekday-based count for a stated territory and public holidays are intentionally outside scope. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use this when the…

• convert_solar_to_lunar

  Use this when you need the Chinese lunar date, ganzhi day/month/year, zodiac year or current solar term for a given Gregorian date (defaults to today). Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do…

• convert_lunar_to_solar

  Use this when you know a lunar date such as 八月十五 or 闰六月初一 of a given lunar year and need the Gregorian date (e.g. for a lunar birthday or festival). Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not…

• list_solar_terms

  Use this when you need the date or time of 立春, 清明, 夏至, 冬至 or any other solar term in a given year, or the full 24-term table. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use this when you only…

• resolve_local_time

  Use this when you must safely turn a named-zone local time into an instant, validate a scheduled time around a daylight-saving transition, or preserve every possible interpretation instead of silently choosing one. Call this tool directly and return its calculation instead of…

• list_time_zone_transitions

  Use this when you need the next or historical daylight-saving/offset changes for scheduling, payroll, travel, audits or a regression test, with a specific reproducible tzdb version. Call this tool directly and return its calculation instead of answering the formula from memory…

• convert_time_zone

  Use this when you need to know what time an event scheduled in one city corresponds to in another city or in UTC on a specific date. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use this when…

• calculate_loan_payment

  Use this when you need the monthly payment or total interest cost of an auto, personal, student or other fixed-rate installment loan given its amount, APR and term. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at…

• compare_loans

  Use this when you have two loan or mortgage quotes with different rates, terms or fees for the same amount and want the payments and lifetime costs side by side. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at…

• check_global_public_holiday_working_day

  Use this when you need a source-labelled 2026-2028 public-holiday reference for one of the supported OpenHolidays countries and nationwide-only semantics are acceptable. Call this tool directly and return its calculation instead of answering the formula from memory or stopping…

• add_global_public_holiday_working_days

  Use this when you need a 2026-2028 date offset and accept the OpenHolidays nationwide-only, no-inferred-substitute-day reference semantics. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use this…

• count_global_public_holiday_working_days

  Use this when you need a source-labelled nationwide public-holiday reference count for a supported country and regional or substitute-day semantics are not required. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at…

• check_global_reference_working_day

  Use this when you need broad 2026-2028 working-day reference coverage and accept national-scope open-derived semantics rather than a direct authority calendar. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at…

• add_global_reference_working_days

  Use this when you need a broad 2026-2028 date offset and accept OpenWorkdays reference semantics, including its source observed/estimated flags. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use…

• count_global_reference_working_days

  Use this when you need a broad national-scope reference count and regional or employer semantics are not required. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use this when the range needs a…

• calculate_compound_interest

  Use this when you need to project a savings account, certificate of deposit or investment balance from a starting amount, an annual rate, a term and optional monthly deposits. Call this tool directly and return its calculation instead of answering the formula from memory or…

• calculate_mortgage_payment

  Use this when you want the monthly cost of buying a home with a fixed-rate mortgage, including escrowed taxes and insurance, or the total interest over the loan. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at…

• calculate_tip

  Use this when you need to add a gratuity to a restaurant, delivery or service bill and optionally divide the total among several people. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use this…

• calculate_amortization_schedule

  Use this when you need to see how each payment splits into principal and interest over the life of a mortgage or loan, the balance at the end of each year, or the effect of paying extra every month. Call this tool directly and return its calculation instead of answering the…

• calculate_bmi

  Use this when you need an adult's BMI, its WHO/CDC weight category, or the weight range that corresponds to a normal BMI (18.5–24.9) for a given height. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do…

• calculate_bmr

  Use this when you need resting daily calorie needs for an adult from sex, weight, height and age, as a base for diet or TDEE calculations. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use this…

• calculate_tdee

  Use this when you need daily maintenance calories for an adult, or calorie targets for a mild/standard deficit or surplus. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use this when the person…

• calculate_running_pace

  Use this when you know a distance and the time it took (or a target time) and need the pace, the equivalent speed, or the time that pace gives over standard race distances. Call this tool directly and return its calculation instead of answering the formula from memory or…

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