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Vimshottari dasha calculator
How the dasha is worked out
The nine planets always follow the same order: Ketu (7 years), Venus (20), Sun (6), Moon (10), Mars (7), Rahu (18), Jupiter (16), Saturn (19) and Mercury (17), which adds up to 120. Your cycle starts with the ruler of the nakshatra your Moon was in at birth, and the part of that period already used up when you were born depends on how far the Moon had moved through the nakshatra.
Each mahadasha is shared among nine antardashas in the same order, starting with its own planet, in proportion to the planets' years.
Which year length is used
Dasha years are counted as 365.25 days here. This is a calculation convention, not the only one: some software uses the sidereal year (about 365.256 days) and some use a 360-day year, which can move dates by days or, over a lifetime, by more than a year. If your dates differ from another tool, the year length is the first thing to check.
Why the birth time matters
The Moon moves about 13 degrees a day, so the start of your cycle depends on your birth time. Without it, this calculator shows the order of the planets but no dates, rather than inventing a time. Where the clocks changed at your birth time, you are asked which time it was.
Frequently asked questions
What is a dasha in Vedic astrology?
A dasha is a planetary period. In the Vimshottari system the 120-year cycle is divided into nine periods, one for each planet, and each has its own sub-periods.
How is my mahadasha calculated?
From the nakshatra of your Moon at birth. Its ruling planet starts your cycle, and the part already passed at birth depends on how far the Moon had moved through that nakshatra.
What is an antardasha?
An antardasha is a sub-period inside a mahadasha. Each mahadasha is divided into nine antardashas, in the same planet order, in proportion to each planet's years.
Why do other websites show slightly different dasha dates?
Programs count a dasha year differently (365.25, about 365.256 or 360 days) and some use the true instead of the mean lunar node or another ayanamsa. The differences are usually days, and larger with a 360-day year.
Can I find my dasha without my birth time?
Not the dates. The Moon moves too far in a day, so the start of your cycle is not known. The calculator shows the order of the planets and asks for a birth time for the dates.
Is the dasha a prediction?
No. The dasha is a timing system. How it is read is interpretation; astrology here is a lens for reflection, not a prediction.
More free tools
Vedic Astro Lab is an AI companion, not a human astrologer. Astrology here is a lens for reflection, not a prediction. Results are calculated from the NASA JPL DE421 ephemeris with the Lahiri ayanamsa; see the how-it-works page for the method and its limits.