Calcgrid

Name: Calcgrid
Author: Calcgrid

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Open calculator engine for AI agents and people: finance, investing, health, fitness, math, statistics, unit conversion, physics, chemistry, engineering, energy, developer, photography, science, Chinese calendar (农历/八字), I Ching (易经) and everyday calculators, each available as HTML, Markdown, JSON API, MCP tool and A2A skill. The public Agent Card is intentionally compact: it highlights five priority capabilities plus search and a generic execution entry; the A2A endpoint still accepts every calculator id. Read-only, deterministic calculations; every result carries the formula, sources and an ISO 8601 timestamp.

searchdiscoverylunarlunar calendarchinese calendar converter农历ganzhisolar termlunar to solarchinese lunar date to gregorian农历转公历leap monthlunar birthdaysolar terms24 solar termsjieqi节气lichuntimetime zone converterconvert time zoneswhat time is it inutc offsetdaylight saving timefinanceloan paymentmonthly paymentamortizationauto loanpersonal loancalculatorexecutiona2a

Declared skills

Search calculators — Find the right calculator from a natural-language task across all 530 calculators; returns calculator ids with required inputs. Use before any calculation when the id is unknown.
Lunar Calendar Converter (农历) — Converts a Gregorian date to the Chinese lunisolar calendar (农历 nongli): lunar year, month (with leap-month flag), day, the sexagenary stems and branches (干支 ganzhi) of year, month and day, zodiac animal, nayin (纳音), the current 24-solar-term period and any traditional festival on that day. Use 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). Do not use when: You start from a lunar date and need the G…
Lunar to Solar Date Converter — Converts a Chinese lunar calendar date (year, month, leap-month flag, day) to the Gregorian date, reporting the weekday, the day's ganzhi (干支) and the length of that lunar month, and validating that the leap month and day exist in that year. Use 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). Do not use when: You start from a Gregorian date (use lunar-calendar-converter), or you want every festival of a…
24 Solar Terms Calculator (二十四节气) — Lists the 24 solar terms (节气 jieqi) of a Gregorian year with their exact instants: the moments the Sun's apparent longitude reaches multiples of 15°, computed astronomically and shown in a chosen UTC offset (China Standard Time by default). Use 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. Do not use when: You only need the term that a specific date falls in (use lunar-calendar-converter), or you need sunrise/sunset times (…
Time Zone Converter — Converts a wall-clock date and time from one IANA time zone to another using the tz database rules built into ICU, so the daylight-saving offsets in force on that date are applied automatically. Reports both UTC offsets, the UTC instant, the weekday and the day difference. Use 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. Do not use when: You need the same instant in many zones at once (use world-clock), an epoch val…
Loan Payment Calculator — Computes the level monthly payment of a fully amortizing fixed-rate loan from principal, annual rate and term, plus the total paid and total interest over the life of the loan. Use 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. Do not use when: You need property tax, insurance and HOA in the payment (use mortgage-payment), or you know the payment and want the payoff time (use debt-payof…

kind A2A Agent Card

name A2A Agent Card

summary A2A Agent Card

version A2A Agent Card

description A2A Agent Card

homepageUrl A2A Agent Card

publisherUrl A2A Agent Card

publisherName A2A Agent Card

Provenance

Where this record came from

Every source is kept verbatim. Field changes are logged as events.

A2A Agent Cardhttps://tttkmbb.com/.well-known/agent-card.json

first seen 23 d ago · fetched 23 d agoopen ↗

ARD catalog (/.well-known/ard.json)urn:air:tttkmbb.com:agent:calculator-agent

first seen 23 d ago · fetched 23 d agoopen ↗

Field history (7 recent events)

23 d ago · declared · summary → "Open calculator engine for AI agents and people: finance, investing, health, fitness, math, statistics, unit conversion
23 d ago · declared · description → "Open calculator engine for AI agents and people: finance, investing, health, fitness, math, statistics, unit conversion
23 d ago · declared · publisherName → "Calcgrid"
23 d ago · declared · publisherUrl → "https://tttkmbb.com"
23 d ago · declared · homepageUrl → "https://tttkmbb.com/docs/a2a.md"
23 d ago · declared · version → "1.5.8"
23 d ago · declared · protocols → ["a2a"]

when	check	result	http	latency	detail
2 h ago	a2a card	ok	200	388 ms	protocol 0.3.0 · card: Calcgrid · 26 skills
9 h ago	a2a card	ok	200	84 ms	protocol 0.3.0 · card: Calcgrid · 26 skills
15 h ago	a2a card	ok	200	60 ms	protocol 0.3.0 · card: Calcgrid · 26 skills
22 h ago	a2a card	ok	200	63 ms	protocol 0.3.0 · card: Calcgrid · 26 skills
28 h ago	a2a card	ok	200	61 ms	protocol 0.3.0 · card: Calcgrid · 26 skills
34 h ago	a2a card	ok	200	46 ms	protocol 0.3.0 · card: Calcgrid · 26 skills
2 d ago	a2a card	ok	200	44 ms	protocol 0.3.0 · card: Calcgrid · 26 skills
2 d ago	a2a card	ok	200	65 ms	protocol 0.3.0 · card: Calcgrid · 26 skills
2 d ago	a2a card	ok	200	111 ms	protocol 0.3.0 · card: Calcgrid · 26 skills
3 d ago	a2a card	ok	200	33 ms	protocol 0.3.0 · card: Calcgrid · 26 skills

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