About fatcalendar

What fatcalendar is

fatcalendar is a free calendar for people whose year does not fit on a single Gregorian grid. It shows day, week, month and year views for 12 traditions - Gregorian, Telugu, Tamil, Kannada, Malayalam, Marathi, Gujarati, Punjabi, Bengali, North Indian (Hindi), Indian Muslim (Hijri), Christian - in 11 languages (English, Telugu, Tamil, Kannada, Malayalam, Marathi, Gujarati, Punjabi, Bengali, Hindi, Urdu), and calculates every time for the place you choose.

Tradition is not language: any tradition can be displayed in any language.

What you get

• Traditional date, month and era (Shaka, Vikram, Kollavarsham, Bangabda, Hijri and more) for every day.
• Tithi, nakshatra, yoga and karana with exact end times.
• Festivals, vratas, fasts, gurpurabs and public holidays, each with the rule that decides its date.
• Auspicious and inauspicious windows (Rahu Kalam, Yamagandam, Gulika, Abhijit, Brahma Muhurta, Varjyam, Durmuhurtham, Amrita, Choghadiya) and Hijri prayer times.
• Illustrated festival banners and cell backgrounds.

Built for people and for agents

Every page is server-rendered semantic HTML and also available as Markdown (send Accept: text/markdown). The same data is available through a REST API, an MCP server, an A2A agent and an SDK. See Docs and Docs for agents.

Where the data comes from

Astronomical calculations are provided by the jotish.ai ephemeris API; fatcalendar adds documented rule arithmetic and caches each result permanently. Read the methodology for details and caveats.

Terms

fatcalendar is provided free of charge, as is, without warranty. Do not rely on it for decisions where an error could cause harm; confirm religious observances with your local almanac or authority. The API is rate limited (120 requests per 60 seconds per client). Data responses may be reused with attribution to fatcalendar.com (CC BY 4.0).

Contact

See Contact. Questions about privacy are covered in the privacy policy.