What is a Śrāddha tithi calculator?

It finds the ancestral lunar tithi at Aparāhṇa on the death date for your city—the key used for Masikam, Oona Masikam, Abdikam, and Thivasam.

Māsikam (மாசிகம்) is the monthly ancestral rite on that death tithi each lunar month until the first annual Abdikam.

What are the four Oona Masikam rites?

Prathama Oona (days 28–30, some families also day 21), Traipakshika (41–45), Oona Shan Masikam (171–180), and Unabdikam / Oonabdika (341–355).

What is Abdikam or Thivasam?

Abdikam (ஆப்திகம்) / Thivasam (திவசம்) is the annual death-anniversary śrāddha on the same ancestral tithi. Unabdikam is the Oona rite just before it.

Which days are avoided for Oona rites?

Common guidance avoids Tuesday, Friday, and Saturday; avoids Prathamai, Caturthī, Ṣaṣṭī, Navamī, Ekādaśī, and Caturdaśī; avoids the Karthā’s birth nakṣatra; and avoids Dvi-/Tri-puṣkara yoga.

Shannavati Tarpanam · Sankalpam

Shraddha tithi, Masikam & Oona Masikam calculator

Free Drikganita calculator for śrāddha tithi, Masikam (மாசிகம்) dates, Oona Masikam / Unabdikam windows, and Abdikam / Thivasam (திவசம்) annual death-anniversary dates for your city. Set your city in the header so Aparāhṇa timings match your place.

What this calculator finds

Śrāddha tithi — the Aparāhṇa ancestral lunar day on the death date (சிராத்த திதி), used for every later rite.

Masikam (மாசிகம்) — monthly śrāddha on that tithi until the first Abdikam / Thivasam year.

Oona Masikam (ஊன மாசிகம்) — four day-count windows: Prathama, Traipakshika, Shan, and Unabdikam, with weekday, tithi, Karthā-star, and Dvi-/Tri-puṣkara filters.

Calculate Śrāddha dates

Place: Set location in the header

Death dateKarthā birth nakṣatra(optional)

Also evaluate the 21st-day Prathama Oona tradition (some families)

Tarpana Sankalpam

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FAQ

What is a Śrāddha tithi calculator?: It finds the ancestral lunar tithi at Aparāhṇa on the death date for your city—the key used for Masikam, Oona Masikam, Abdikam, and Thivasam.
What is Māsikam?: Māsikam (மாசிகம்) is the monthly ancestral rite on that death tithi each lunar month until the first annual Abdikam.
What are the four Oona Masikam rites?: Prathama Oona (days 28–30, some families also day 21), Traipakshika (41–45), Oona Shan Masikam (171–180), and Unabdikam / Oonabdika (341–355).
What is Abdikam or Thivasam?: Abdikam (ஆப்திகம்) / Thivasam (திவசம்) is the annual death-anniversary śrāddha on the same ancestral tithi. Unabdikam is the Oona rite just before it.
Which days are avoided for Oona rites?: Common guidance avoids Tuesday, Friday, and Saturday; avoids Prathamai, Caturthī, Ṣaṣṭī, Navamī, Ekādaśī, and Caturdaśī; avoids the Karthā’s birth nakṣatra; and avoids Dvi-/Tri-puṣkara yoga.