A mahadasha is the major planetary period in Vimshottari dasha — one of nine, years long, totalling 120 years across a lifetime. An antardasha is the sub-period nested inside that mahadasha: all nine grahas take a turn again, in the same fixed order (starting with the mahadasha's own lord), each proportionally sized within that mahadasha's length.
Put simply: the mahadasha is the chapter, the antardasha is the section inside the chapter. Both are needed to read timing — a mahadasha alone is usually too coarse (a Shani Mahadasha runs 19 years) to say much about when within it a theme sharpens.
Mahadasha vs Antardasha, side by side
| Mahadasha (महादशा) | Antardasha (अंतर्दशा) | |
|---|---|---|
| What it is | The major period — one of nine, one per dasha lord | The sub-period nested inside one mahadasha |
| Count | 9, covering 120 years total | 9 inside each mahadasha (one per lord, own lord first) |
| Typical length | 6 to 20 years | ~3.6 months to just over 3 years |
| Order | Fixed: Ketu, Shukra, Surya, Chandra, Mangal, Rahu, Guru, Shani, Budh | Same fixed order, but starting from the mahadasha's own lord |
| What comes next inside it | Nine antardashas | Nine pratyantardashas (a further nested layer) |
| Reads as | The broad chapter — which theme is in focus for years | The narrower window — when inside that chapter it sharpens |
Both come from the same Vimshottari dasha system and the same nine dasha lords — an antardasha is not a separate system layered on top, it is the same nine-planet sequence repeating at a smaller scale, the way a year holds months.
How an antardasha's length is actually calculated
The formula is fixed and the same for every chart:
Antardasha length = Mahadasha length × (Antardasha lord's own full mahadasha years ÷ 120)
The nine mahadasha lengths never change: Ketu 7, Shukra 20, Surya 6, Chandra 10, Mangal 7, Rahu 18, Guru 16, Shani 19, Budh 17 years — 120 in total. To find how long, say, the Rahu antardasha runs inside a 20-year Shukra Mahadasha: 20 × 18 ÷ 120 = 3 years exactly. Every antardasha inside any mahadasha is worked out the same way, and the nine of them always add back up to the mahadasha's own full length — nothing is lost or invented in the split.
Worked example — every antardasha inside a Shukra Mahadasha
Shukra's Mahadasha (20 years, the longest of the nine) gives clean numbers, so it makes the clearest worked example. The antardashas run in the fixed order starting from Shukra's own:
| Antardasha lord | Formula | Length |
|---|---|---|
| Shukra — Venus (शुक्र) | 20 × 20 ÷ 120 | 3 years 4 months |
| Surya — Sun (सूर्य) | 20 × 6 ÷ 120 | 1 year |
| Chandra — Moon (चंद्र) | 20 × 10 ÷ 120 | 1 year 8 months |
| Mangal — Mars (मंगल) | 20 × 7 ÷ 120 | 1 year 2 months |
| Rahu (राहु) | 20 × 18 ÷ 120 | 3 years |
| Guru — Jupiter (गुरु) | 20 × 16 ÷ 120 | 2 years 8 months |
| Shani — Saturn (शनि) | 20 × 19 ÷ 120 | 3 years 2 months |
| Budh — Mercury (बुध) | 20 × 17 ÷ 120 | 2 years 10 months |
| Ketu (केतु) | 20 × 7 ÷ 120 | 1 year 2 months |
| Total | 20 years |
Notice the antardashas are not equal slices of the 20 years — a Rahu antardasha (3 years) runs three times as long as a Surya antardasha (1 year) inside the very same Shukra Mahadasha, because each is sized by its own lord's classical weight, not by a simple one-ninth split. This is exactly why the shortest antardasha the whole 120-year cycle can produce is Surya's own antardasha inside a Surya Mahadasha — 6 × 6 ÷ 120 ≈ 3.6 months — while the longest is Shukra's own antardasha inside a Shukra Mahadasha, shown above at 3 years 4 months.
Three lords, not one — where the pratyantardasha fits
The nesting does not stop at the antardasha. Each antardasha itself divides into nine pratyantardashas (प्रत्यंतर्दशा) — a further, weeks-to-months layer, calculated the same proportional way but sized within the antardasha's own length rather than the mahadasha's. So at any given moment, three lords are running together: the mahadasha lord, the antardasha lord, and the pratyantardasha lord. A reading looks at that whole combination — the mahadasha names the years-long chapter, the antardasha narrows it to the actual window, and the pratyantardasha narrows it further still.
Can a difficult antardasha sit inside a good mahadasha?
Yes — and this is ordinary, not a contradiction to explain away. A supportive Guru Mahadasha can still contain one or two antardashas of a planet that sits weaker in the birth chart, and those months read as a harder patch inside an otherwise steady chapter. The reverse holds too: a mahadasha with a difficult classical reputation can contain a genuinely supportive antardasha. Neither layer overrides the other — both are read against what the natal chart itself already promises for that specific planet, never as one blanket verdict stamped across the whole period.
"Antardasha kharab hai, isliye poora saal kharab jayega" skips a step. A single antardasha is one nested layer of a much longer chapter, and its actual effect still depends on what your own chart holds for that planet — not the antardasha label alone. An honest reading names the window a theme is active in and checks it against your chart, rather than reading one sub-period as a verdict on the whole year.
How Ravitra reads your mahadasha and antardasha together
Ravitra computes your real birth chart the classical way — Lahiri (Chitrapaksha) sidereal, from your janma nakshatra — and builds your full Vimshottari timeline: which mahadasha is running, which antardasha inside it, and the month-and-year window each one covers. It never treats an antardasha label alone as a verdict — every period is read against what your own chart already promises for that planet, in plain month-and-year windows, never fake exact dates.
See your own mahadasha and antardasha timeline
Enter your birth details and Ravitra shows exactly which mahadasha and antardasha are running for you right now — with real windows, not a guess — and what your own chart actually says about them. No fear, no fake dates, no remedies to sell.
Get it onGoogle PlayFrequently asked questions
Mahadasha aur antardasha mein kya fark hai? (What is the difference between mahadasha and antardasha?)
A mahadasha is the major planetary period — one of nine, years long, totalling 120 years. An antardasha is the sub-period nested inside it: all nine grahas take a turn again, in the same fixed order starting with the mahadasha's own lord, each proportionally sized within that mahadasha's length. Mahadasha is the chapter; antardasha is the section inside the chapter.
How is an antardasha's length actually calculated?
Antardasha length = mahadasha length × (antardasha lord's own full mahadasha years ÷ 120). Inside a 20-year Shukra Mahadasha, the Rahu antardasha (Rahu's own mahadasha is 18 years) runs 20 × 18 ÷ 120 = 3 years exactly. Every antardasha in the system is worked out this same way, and the nine inside one mahadasha always add back up to that mahadasha's full length.
Which antardasha runs first inside a mahadasha?
The mahadasha's own lord's antardasha runs first. The remaining eight grahas then follow in the same fixed Vimshottari order (Ketu, Shukra, Surya, Chandra, Mangal, Rahu, Guru, Shani, Budh), wrapping back to Ketu after Budh where needed.
Which matters more for prediction — mahadasha or antardasha?
Neither alone — a third layer, the pratyantardasha, joins them too. The mahadasha sets the broad chapter, the antardasha narrows it to the actual window, and the pratyantardasha narrows it further. Three lords run together at any moment, and a reading looks at the combination.
Can a difficult antardasha happen inside a good mahadasha, or the other way round?
Yes, and it's normal. A supportive mahadasha can still contain a harder antardasha for a weaker-placed planet, and a difficult mahadasha can contain a genuinely supportive antardasha. Both are read against what the birth chart promises for that specific planet, not as one blanket verdict for the whole period.
How many antardashas are there, and how long does each one last?
Exactly nine inside every mahadasha, one per dasha lord. Length varies by which mahadasha they sit inside — from about 3.6 months (Surya's antardasha inside a Surya Mahadasha, the shortest possible) up to just over 3 years (Shukra's own antardasha inside a Shukra Mahadasha, the longest). Each antardasha further divides into nine even-shorter pratyantardashas.
Reviewed for classical accuracy · September 2026
Sources: The Viṁśottarī daśā sequence, the nine mahādaśā lengths totalling 120 years, and the antar-daśā/pratyantar-daśā proportional-nesting rule (each sub-period sized as parent-period-years × sub-lord's-own-mahādaśā-years ÷ 120, own lord's sub-period first, same fixed order thereafter) — Bṛhat Parāśara Horā Śāstra (Viṁśottarī Daśā adhyāya).
Grounded in the classical Vedic corpus and computed on the Lahiri (Chitrapakṣa) sidereal zodiac. Ravitra states timing as windows, never exact dates, and never sells remedies.