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Tithi Calculator | Determine Lunar Tithi For Date

A Tithi Calculator helps calculate tithi calculator using Vedic astrology, panchang, calendar, muhurat, Vastu or naming inputs. It gives an instant browser-based result with a transparent method and source notes. Use it for planning and learning, then verify important ritual or marriage decisions with a qualified practitioner.

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

hours
Results

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Quick reference

#Shukla paksha (waxing)Krishna paksha (waning)
1PratipadaPratipada
4ChaturthiChaturthi (Sankashti)
8AshtamiAshtami (Kalashtami)
11EkadashiEkadashi
13Trayodashi (Pradosh)Trayodashi (Pradosh)
15Purnima (full moon)Amavasya (new moon)

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For ceremonies, marriage matching and legal decisions, verify with a qualified practitioner and your regional panchang.

Interpretation guide

ResultWhat it means
Shukla pakshaMoon waxing — from new moon to full moon; favoured for growth-type beginnings
Krishna pakshaMoon waning — from full moon to new moon
Tithi at sunrise (udaya tithi)The tithi used for most vrats and festival dates
Tithi changes mid-dayPossible — a tithi lasts ~19 to 26 hours, not a fixed 24
Kshaya / vriddhi tithiA tithi can be skipped or repeated across two sunrises

lightbulb Worked example

Let's say you are using the Tithi Calculator. A Tithi Calculator helps calculate tithi calculator using Vedic astrology, panchang, calendar, muhurat, Vastu or naming inputs. It gives an instant browser-based result with a transparent method and Enter the values that match your situation into the input fields and press calculate — using realistic numbers makes the result directly useful for you.

Result: The calculator instantly applies the formula Tithi number = ⌈(Moon longitude − Sun longitude) / 12°⌉; 1–15 Shukla, 16–30 Krishna and returns the result with appropriate precision.

What this means: Read the result in the context of what you are measuring. The step-by-step breakdown lets you confirm the math and understand which input most affects the outcome.

Formula & methodology

Formula: Tithi number = ⌈(Moon longitude − Sun longitude) / 12°⌉; 1–15 Shukla, 16–30 Krishna

The Tithi Calculator is built on a well-established calculation method. It uses the formula Tithi number = ⌈(Moon longitude − Sun longitude) / 12°⌉; 1–15 Shukla, 16–30 Krishna to turn your inputs into a reliable result. A Tithi Calculator helps calculate tithi calculator using Vedic astrology, panchang, calendar, muhurat, Vastu or naming inputs. It gives an instant browser-based result with a transparent method and source notes. Use it The steps are shown on the page so you can follow the reasoning from input to output.

  1. Enter the date and your city’s coordinates and UTC offset.
  2. The calculator computes the Moon’s and Sun’s ecliptic longitudes at local sunrise (Meeus series).
  3. Their angular difference divided by 12° gives the tithi (each tithi is one 12° step of elongation).
  4. The same chart yields nakshatra, yoga and karana for the day.

Worked example — Delhi, 10 Jun 2026: at sunrise 05:23 the Moon–Sun elongation sits in the 25th step, i.e. Krishna Dashami of Jyeshtha, with nakshatra Uttara Bhadrapada (pada 4), yoga Sukarma and karana Vishti — matching the published panchang for that day.

Authoritative source: Drik Panchang — Hindu Calendar & Panchang

Frequently asked questions

What is a tithi?
A tithi is a lunar day: the time the Moon needs to gain 12° of longitude over the Sun. Thirty tithis make one lunar month — fifteen waxing (Shukla) from new moon to full moon, and fifteen waning (Krishna) back to new moon.
Why is the tithi taken at sunrise?
Hindu calendars assign each civil day the tithi prevailing at local sunrise (udaya tithi). A tithi lasts between roughly 19 and 26 hours, so it rarely aligns with midnight-to-midnight — the sunrise rule gives one unambiguous tithi per day for vrats and festivals.
Can two days have the same tithi, or a tithi be skipped?
Yes. If a long tithi spans two sunrises it repeats (vriddhi); if a short one begins and ends between sunrises it never “owns” a day (kshaya). This is why festival dates occasionally differ between panchangs and regions.
What are paksha, yoga and karana?
Paksha is the lunar fortnight (Shukla waxing, Krishna waning). Yoga is one of 27 combinations of the Sun-plus-Moon longitudes. A karana is half a tithi (6° of elongation). Together with the weekday and nakshatra, these are the five limbs (panchang) of the Hindu day.
How accurate is this calculator?
It uses Meeus-series Sun and Moon longitudes (validated to within a few hundredths of a degree) with Lahiri ayanamsa and NOAA sunrise times, so the tithi matches mainstream Drik panchangs. Near a tithi boundary (±1–2 minutes of sunrise), regional panchangs may differ — verify locally for ritual edge cases.
What does the Tithi Calculator do?
A Tithi Calculator helps calculate tithi calculator using Vedic astrology, panchang, calendar, muhurat, Vastu or naming inputs. It gives an instant browser-based result with a transparent method and source notes. Use it for planning and learning, then verify. The calculator takes your inputs, applies the standard calculation, and returns a clear result so you can make an informed decision without doing the math by hand.
What formula does the Tithi Calculator use?
It computes Tithi number = ⌈(Moon longitude − Sun longitude) ÷ 12°⌉, with numbers 1–15 forming the Shukla (waxing) fortnight and 16–30 the Krishna (waning) fortnight. Each tithi is a lunar day of about 24 hours, though its length varies. Enter a date and the tool returns the tithi, its nakshatra, and the phase of the Moon at that moment.
Is the Tithi Calculator free and private?
Yes — the Tithi Calculator. There is no sign-up, no paywall, no trial, and no limit on how many calculations you can run. CalcaTools covers its costs with non-intrusive display advertising, so the calculator itself never asks for payment or restricts any feature.
How accurate is the Tithi Calculator?
The Tithi Calculator applies the standard formula: Tithi number = ⌈(Moon longitude − Sun longitude) / 12°⌉; 1–15 Shukla, 16–30 Krishna. It is tested against published worked examples before launch and uses native double-precision arithmetic, so results are accurate to typical precision for the values you enter — with no intermediate rounding that could distort the answer.

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