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Amavasya Date Calculator | New Moon Days by Year

The Amavasya Date Calculator finds when the Moon−Sun elongation crosses 0° each lunar month — the Amavasya tithi — for your chosen year and regional panchang (North/South Indian), listing each Amavasya's civil date and its tithi window for rituals like tarpanam.

Last updated: September 2026 · Free · No sign-up required

Results

Enter values above and click Calculate to see your result instantly.

Quick reference

Amavasya occurrences per lunar year: 12 (13 in adhika years). Key observances:

AmavasyaMonthSignificance
MahalayaBhadrapadaPitru Paksha ends
DeepavaliKartikaLakshmi puja
MauniMaghaSilent observance

public Location matters

Tithi and nakshatra boundaries depend on where you are — enter your city's coordinates for precise results.

schedule Ayanamsa

Calculations use the Lahiri (Chitrapaksha) ayanamsa, the standard for Vedic charts.

menu_book Panchang basis

Results follow drik-panchang style astronomical computation, not printed-table approximation.

school Traditions differ

Some regions use Surya Siddhanta conventions; where traditions conflict, your family panchang wins.

lightbulb A real example — Mahalaya Amavasya

Finding the Mahalaya Amavasya (Pitru Paksha's final day) date.

Result: It is the Amavasya of Bhadrapada month — in 2026 falling in late September; the calculator lists the exact tithi window for tarpanam.

What this means: Ritual windows often run only hours; checking the tithi end time prevents performing rites after Amavasya lapses.

Formula & methodology

Formula: Tithi = ⌊(Moon−Sun elongation) ÷ 12°⌋; Nakshatra = ⌊Moon longitude ÷ 13°20'⌋; Vimshottari lord sequence Ketu→Venus→Sun→Moon→Mars→Rahu→Jupiter→Saturn→Mercury

How the Vedic calculation works

All Hindu calculators on CalcaTools share one astronomical runtime: Julian-day conversion, mean planetary longitudes, Lahiri ayanamsa, then derivation of tithi (Moon−Sun elongation ÷ 12°), nakshatra (Moon longitude ÷ 13°20'), rashi (Moon sign), and the Vimshottari dasha sequence (Ketu 7, Venus 20, Sun 6, Moon 10, Mars 7, Rahu 18, Jupiter 16, Saturn 19, Mercury 17 years) anchored at the birth nakshatra's lord.

Festival dates use tabulated panchang data; muhurat windows use sunrise/sunset plus planetary day-lord hours. Default location is Delhi (28.61°N, 77.21°E, IST) unless you enter coordinates — a birth 500 km west shifts nakshatra boundaries in edge cases, so exact coordinates matter for precision work.

Frequently asked questions

What is Amavasya?
The new-moon tithi — when the Moon sits between the Sun and Earth and is invisible. It is the 15th tithi of the Krishna paksha (waning fortnight).
Why do Amavasya dates differ North vs South India?
Panchangs differ on which day a tithi 'belongs' to: North Indian calendars use sunrise-to-sunrise counting, South Indian (Amanta) months end at Amavasya — dates can shift by a day at boundaries.
What rituals are done on Amavasya?
Tarpanam (water offerings to ancestors), pitru worship at temples, and special observances like Diwali's Lakshmi puja fall on the new moon of Kartika.
How often does Amavasya occur?
Every 29.5 days — twelve to thirteen times a year, once per lunar month.

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