Tithi Calculator
Find the exact Vedic Lunar Day (Tithi) for any date and time to plan festivals, fasting, and auspicious events.
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*Calculations default to India Standard Time (IST) and New Delhi coordinates.
What is the Tithi Calculator?
A Tithi is a lunar day in the traditional Hindu calendar (Panchang). It measures the exact angle between the Sun and the Moon. Because the Moon moves at a variable speed, a Tithi can last anywhere from 19 to 26 hours. People use Tithis to determine the correct days for fasting, planning weddings, scheduling business launches, and celebrating festivals like Diwali or Navaratri.
Our Tithi Calculator runs on our proprietary astronomical engine. This system tracks planetary positions with mathematical precision instead of relying on rough, printed almanacs. By entering your date and time, the calculator finds the exact lunar angle and returns the correct Tithi down to the minute.
Understanding the Lunar Phases (Paksha)
The lunar month splits into two phases. Each phase contains 15 Tithis. The phase you are in determines the general energy of the day.
Shukla Paksha (Waxing Moon)
This is the bright half of the month. It starts right after the New Moon and ends on the Full Moon (Purnima). Astrologers consider these 15 days highly auspicious for starting new projects, making investments, or getting married. As the Moon grows brighter, the energy supports growth and accumulation.
Krishna Paksha (Waning Moon)
This is the dark half of the month. It begins after the Full Moon and ends on the New Moon (Amavasya). This phase is ideal for finishing old tasks, paying off debt, deep cleaning, or spiritual practices. It is generally not recommended for launching a new business or buying a new home.
Important Tithis for Fasting and Events
Not all lunar days are equal. Certain Tithis carry specific planetary energies that make them perfect for fasting or rituals.
Ekadashi (11th Day)
Ekadashi happens twice a month. It is the most highly recommended day for fasting. The lunar pull is strong, and fasting on this day rests the digestive system and clears the mind for spiritual focus.
Chaturthi (4th Day)
The 4th day belongs to Lord Ganesha. The Chaturthi in the Krishna Paksha is called Sankashti Chaturthi, a popular day to fast for the removal of obstacles.
Purnima (Full Moon)
The 15th day of Shukla Paksha. The Moon is fully illuminated, making this a high-energy day. It is excellent for public events, celebrations, and worshipping the goddess Lakshmi.
Amavasya (New Moon)
The 15th day of Krishna Paksha. The Moon is completely dark. This day is reserved for honoring ancestors and engaging in meditation. You should avoid starting material projects on Amavasya.
Frequently Asked Questions
Why does the Tithi change in the middle of the day?
A normal day (based on the Sun) lasts exactly 24 hours. A Tithi is based on the angle between the Sun and Moon. Since the Moon moves fast, a 12-degree gap can happen at any time. This is why a Tithi might start at 3:00 PM and end at 2:00 PM the next day.
How do I know which Tithi applies to my fast?
For most fasts, the Tithi that is active at sunrise is considered the ruling Tithi for that entire day. There are exceptions for specific evening festivals, but checking the sunrise Tithi is the standard rule.
Are all Shukla Paksha days good?
No. Even during the bright half of the month, certain days like the 4th, 9th, and 14th are called "Rikta" (empty) Tithis. Astrologers advise against doing important work on Rikta days.
Is the Tithi the same everywhere in the world?
The exact moment a Tithi ends is the same across the globe in absolute time. However, because local time zones differ, a Tithi might end at 10:00 AM in India but at 12:30 AM in New York. You must calculate it for your specific time zone.