Vimshottari Dasha Calculation Explained

Vimshottari dasha is the most widely used timing system in Vedic astrology. It divides life into planetary periods called dasas (or mahadashas), each ruled by one of the nine planets, and each split further into bhuktis (antardashas). Knowing how it is calculated helps you check any horoscope and understand why your dasa started when it did.

This guide explains the 120-year cycle, how the starting dasa comes from your birth star, how to work out the balance of dasa at birth, and how bhuktis are timed.

The 120-year cycle

"Vimshottari" means "one hundred and twenty". The full cycle of nine dasas adds up to 120 years, in this fixed order:

Order	Dasa lord	Years
1	Ketu	7
2	Venus	20
3	Sun	6
4	Moon	10
5	Mars	7
6	Rahu	18
7	Jupiter	16
8	Saturn	19
9	Mercury	17
	Total	120

After Mercury the sequence returns to Ketu. Nobody starts at Ketu by default: your starting point depends on the Moon.

Step 1: Find the Moon's nakshatra and its lord

The zodiac's 360 degrees are divided into 27 nakshatras of 13 degrees 20 minutes each. The nine dasa lords rule the nakshatras in the same order as the table above, repeating three times:

Dasa lord	Nakshatras
Ketu	Ashwini, Magha, Moola
Venus	Bharani, Purva Phalguni, Purva Ashadha
Sun	Krittika, Uttara Phalguni, Uttara Ashadha
Moon	Rohini, Hasta, Shravana
Mars	Mrigashira, Chitra, Dhanishta
Rahu	Ardra, Swati, Shatabhisha
Jupiter	Punarvasu, Vishakha, Purva Bhadrapada
Saturn	Pushya, Anuradha, Uttara Bhadrapada
Mercury	Ashlesha, Jyeshtha, Revati

The lord of the Moon's nakshatra at birth rules your first dasa.

Step 2: Work out the balance of dasa at birth

You are rarely born at the very start of a nakshatra. The Moon has already crossed part of it, so only part of the first dasa remains. The rule:

Balance = (degrees of the nakshatra still to be crossed / 13 degrees 20 minutes) x years of the dasa lord

Worked example

Suppose the Moon is at 15 degrees Taurus (sidereal).

1. Taurus begins at 30 degrees of the zodiac, so the Moon's longitude is 30 + 15 = 45 degrees.
2. Rohini spans 40 degrees 00 minutes to 53 degrees 20 minutes. The Moon is in Rohini, ruled by the Moon.
3. Already crossed: 45 - 40 = 5 degrees. Still to cross: 13 degrees 20 minutes - 5 degrees = 8 degrees 20 minutes.
4. Fraction remaining: 8.333 / 13.333 = 0.625.
5. Balance of Moon dasa: 0.625 x 10 years = 6.25 years = 6 years 3 months.

So this person is born with Moon dasa, balance 6 years 3 months. After that come Mars (7 years), Rahu (18), Jupiter (16), Saturn (19), Mercury (17), Ketu (7), Venus (20) and Sun (6), in that order.

Add each period to the birth date to get the calendar dates when each dasa begins.

Step 3: Bhuktis (antardashas)

Each mahadasha is divided into nine bhuktis. The first bhukti belongs to the mahadasha lord itself; the rest follow the same Ketu-to-Mercury order from there. The length of each:

Bhukti length (years) = mahadasha years x bhukti lord's years / 120

Example: Jupiter mahadasha

• Jupiter-Jupiter: 16 x 16 / 120 = 2.133 years = 2 years 1 month 18 days
• Jupiter-Saturn: 16 x 19 / 120 = 2.533 years = 2 years 6 months 12 days
• Jupiter-Mercury: 16 x 17 / 120 = 2.267 years = 2 years 3 months 6 days

The nine bhuktis always add back up to the full mahadasha (here 16 years). Each bhukti can be split again the same way into antara periods (pratyantardashas) for finer timing.

If you are born part-way through a dasa, the bhuktis already "used up" before birth are simply skipped; the running bhukti is found by counting the elapsed part of the dasa through the bhukti list.

Why dates can differ slightly

Two correct calculations may still differ by a few days because of:

• Ayanamsa: the Moon's sidereal position shifts with the ayanamsa used (Lahiri is the most common in India).
• Birth time: the Moon moves about half a degree an hour, so a 10-minute error in birth time shifts the balance of a 10-year dasa lord by about three weeks.
• Year length: some astrologers convert fractions using a 365.25-day year, others a 360-day year.

A difference of months, not days, usually means the birth time or the ayanamsa setting is wrong.

How the dasas are read

The calculation only tells you when each planet's period runs. What it brings depends on the dasa lord's house, sign, strength, the houses it owns and its relationship with the Lagna. The same Saturn dasa can be productive for one chart and demanding for another. For balanced readings of two of the longest periods, see Rahu mahadasha effects and Saturn mahadasha effects.

Vimshottari is not the only dasa system. Some charts are also checked with sign-based or nakshatra-pada-based systems; for one of these, see what is Kalachakra dasa.

Summary

Vimshottari dasha is a 120-year cycle of nine planetary periods. Your first dasa is ruled by the lord of the Moon's birth nakshatra, and its balance is the unfinished fraction of that nakshatra multiplied by the lord's years. Bhuktis are found with mahadasha years x bhukti years / 120, starting with the mahadasha lord. Software such as Sithars Astrology does this to the day, but knowing the method lets you check any chart yourself.

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