Free online calculator
Discover the Gregorian date your traditional Hindu birthday falls on in any year - by your Nakshatra (birth star) or Tithi (lunar day), according to your family's regional tradition. Pick a tradition, enter your birth details, choose a year, and you'll get the matching date(s).
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Solar month vs Moon rasi. The Tamil / Kerala solar month (Chithirai, Karthigai, Vrischikam, etc.) is named after the Sun's rashi at your birth - NOT your Moon rasi. Someone born on 30 November belongs to Karthigai (Sun in Vrishchika), even if their Moon rasi is Simha. Pick the month whose Gregorian date range covers your birthday.
Nakshatra vs Tithi. Most traditions identify a "star birthday" by Nakshatra (the birth star, i.e. the Moon's lunar mansion at birth). The North Indian Purnimanta tradition uses Tithi instead (the lunar day). The form switches automatically based on the tradition you pick.
Local names. When you pick Tamil / Kerala / Andhra-Telugu, nakshatra chips show the local name with the Sanskrit name on the second line - for example "Avittam · Dhanishta" - so you can find your nakshatra by whichever name is familiar.
Multiple results. Some lunar combinations occur twice in a year (typically due to an Adhika masa). The calculator lists every occurrence and flags the adhika one; most traditions observe the date in the regular (nija) month.
Sidereal Sun and Moon positions are computed with Swiss Ephemeris using Lahiri ayanamsa. New / full moons and sankrantis are refined to sub-second precision via Newton-Raphson. Sunrise at the chosen lat/lon is the observance instant for Nakshatra and Tithi.
Intercalary lunar months (no sankranti) are tagged Adhika and named after the following nija month. Lost months (two sankrantis) are tagged Kshaya. Skipped tithis at sunrise are also detected.
This is an astronomical approximation. It does not differentiate Vakya / Thirukanitha variants, Vaishnava and temple-specific observances, prevailing-tithi rules (madhyahna, arunodaya, nishita), vedha exclusions, or historical timezone shifts. Sunrise uses Swiss Ephemeris defaults (upper-limb with refraction). For religious observance, verify with a printed panchang or your family priest.