Shadbala literally means 'six strengths.' Think of it as a report card for each of the seven planets in your birth chart, in Vedic astrology, a planet is graded on six different tests — where it sits, which direction it faces, what time it is, how it's moving, its baseline power, and how other planets are looking at it — and the scores are added into one total. Instead of an astrologer just saying 'Jupiter looks strong to me,' Shadbala gives an actual number, so you can compare planets the way you'd compare exam marks.

What are the six balas (the six kinds of strength)?

Sthana bala is strength from placement — basically, how good the planet's seat is, like a manager's corner office versus a shared cubicle. Dig bala is strength from direction — every planet has a favorite direction in the chart, and it scores higher the closer it sits to that spot. Kala bala is strength from timing — was it day or night, what phase was the Moon in, whose 'hour' was it, and so on. Chesta bala is strength from motion, and it's highest when a planet is about to appear to move backward (retrograde). Naisargika bala is a fixed strength every planet is simply born with, no chart involved — the Sun always gets the most. Drik bala is the strength a planet gains or loses just from being looked at by other planets, friendly planets add to it, difficult ones subtract.

What is a rupa in Shadbala?

A rupa is simply the unit the final Shadbala score is measured in, the way you'd measure distance in miles instead of feet. Sixty of the smaller units, called virupas, make one rupa. And here's the part beginners miss: every planet has its own passing grade. The Sun, Mars and Saturn need 5 rupas to be called strong, Venus needs 5.5, the Moon needs 6, Jupiter needs 6.5, and Mercury has the toughest bar of all at 7. So the same score can be a pass for one planet and a fail for another.

Does a high Shadbala mean a planet gives good results?

No, and this trips up a lot of beginners. Shadbala measures how much power a planet has, not whether that power is used kindly. Think of it like a loud microphone: a strong planet is a loud microphone, but it doesn't tell you what's being said into it. A strong troublesome planet can cause a lot of trouble, forcefully. A weak helpful planet, meanwhile, might promise good things it simply doesn't have the energy to deliver. Strength and 'good versus bad' are two separate questions.

Is this Shadbala calculator free?

Yes, completely free, no account needed. It runs on the Swiss Ephemeris (the same astronomical data professional software uses) with the Lahiri ayanamsha, the sidereal measuring system most Indian astrologers use. One thing to know before you start: get your birth time as accurate as you can. Two of the six strengths here, Kala bala and Dig bala, are directly tied to the clock and to your rising sign, so a birth time that's off by even thirty minutes can nudge the results.

Shadbala Calculator — Free Planet Strength by Date of Birth

What is Shadbala, in plain terms?

Shadbala means “six strengths” in Sanskrit. Picture each planet in your birth chart walking into a job interview. Shadbala is the scorecard the interviewer fills out — six separate categories, each scored on its own, then totaled into one number that says how much real power that planet is bringing to the table.

Why bother? Because without a number, everything is opinion. One astrologer says your Jupiter looks well placed; another disagrees. Shadbala settles it with math: say Jupiter comes out to 428 virupas (the small unit these strengths are counted in) against a requirement of 390, while Saturn only reaches 266 against a requirement of 300. Now you're not arguing anymore — Jupiter cleared its bar and Saturn didn't, full stop. That's the whole appeal of Shadbala: it turns a vague impression into a measurement.

The six balas — what each one actually measures

Sthana bala (strength from placement). This is the biggest of the six, and it's about how good the planet's "seat" is — the sign it's in, whether that's a sign it loves or barely tolerates. A planet near its exaltation point is like an employee sitting in the CEO's chair; a planet in its fall is like that same employee locked in the supply closet. Five separate checks feed into this one score.
Dig bala (strength from direction). Every planet has one direction in the chart where it feels most at home — Jupiter and Mercury like the ascendant (the first house), the Sun and Mars like the tenth house, Saturn likes the seventh, and the Moon and Venus like the fourth. The closer a planet sits to its favorite direction, the higher this score climbs.
Kala bala (strength from timing). This is the largest category, and the one most sensitive to your exact birth time. It asks: was it day or night when you were born? What phase was the Moon in? Whose "hour" was it — astrology divides each day into ruling hours, much like time zones divide the globe? All of that gets folded in here.
Chesta bala (strength from motion). Planets don't move at a constant speed across the sky — they seem to slow down, and even appear to go backward (retrograde) sometimes. A planet gets its highest Chesta score right around that retrograde turn. The Sun and Moon never go retrograde, so the system borrows a substitute score for them instead.
Naisargika bala (natural strength). Think of this as a planet's baseline salary — fixed, no matter whose chart it appears in. The Sun always earns the most here, 60 virupas, with the ranking stepping down planet by planet to Saturn at the bottom, 8.57.
Drik bala (strength from being watched). Other planets "look" at a planet from certain angles, called aspects. A friendly planet's gaze adds strength; a difficult planet's gaze subtracts it. This is the only one of the six that can end up negative — a planet can genuinely lose points here.

Rupas, virupas, and why the "required" score matters

Shadbala scores are counted in virupas, and every sixty virupas bundle up into one rupa — rupas are just the bigger, easier-to-read unit, the way you'd talk about a trip in miles rather than in individual steps. But here's the part that trips people up: the passing score isn't the same for every planet. Each one is graded on its own curve.

Sun, Mars, Saturn need 5 rupas (that's 300 virupas) to pass
Venus needs 5.5 rupas
Moon needs 6 rupas
Jupiter needs 6.5 rupas
Mercury has the toughest bar of all: 7 rupas

So imagine two planets both land on 400 virupas. For Saturn, that's a comfortable pass — well past its 300-virupa requirement. For Mercury, that same 400 is actually a fail, since Mercury needs 420. Quoting a raw total without mentioning the requirement — and a surprising number of free tools do exactly that — makes whichever planet scores the biggest number look "strongest," even when it isn't.

Strong doesn't mean good

Here's the single biggest misunderstanding beginners have about Shadbala: a high score is not a good-news score. Shadbala measures how much power a planet can throw around — its capacity to act — and says nothing about whether you'll like what it does with that power.

Think of it like volume on a speaker, not the content of the song. A planet traditionally seen as troublesome, sitting at high Shadbala, will cause trouble loudly and effectively. A planet traditionally seen as helpful, sitting below its requirement, might mean well but simply lack the energy to follow through. The useful move is to read Shadbala alongside the houses that planet rules and the dasha periods (planetary time periods) it governs — strength tells you how loud a planet is, the rest of the chart tells you what it's actually saying.

Why your birth time matters more on this page

Most calculators on this site can shrug off a birth time that's off by ten or fifteen minutes. This one can't, and it's worth knowing why before you put too much weight on a result.

Kala bala reads the clock directly — the ruling hour changes every sixty minutes, and crossing from one third of the day into the next can shift a planet's score by a full 60 virupas right at that boundary. Dig bala is measured from your ascendant (rising sign), which itself shifts by a whole sign roughly every two hours. Put those together and an hour of uncertainty in your birth time can genuinely flip a planet from "passed" to "failed," or back.

Why other calculators give you different numbers

If you've run your details through more than one Shadbala calculator, don't panic when the totals don't match — that's normal, and it doesn't automatically mean one tool is wrong. A few things commonly cause the gap:

Ayanamsha (the reference point used to measure planet positions). This site uses Lahiri, the most widely used standard. A tool using Raman or KP shifts every planet's position by a degree or two, which can nudge Sthana bala and even flip which sign a planet falls in for some of the divisional charts.
House system. One part of Sthana bala depends on which house a planet occupies, and different house systems (whole-sign, equal, Sripati) can disagree right near a cusp — worth up to 45 virupas on its own.
Missing pieces. Plenty of free tools only bother implementing three or four of the six balas and quietly skip smaller components like Tribhaga bala or the various "ruling lord" bonuses. Left out, those are worth roughly 150 virupas combined.
Two scores that get doubled. Classical texts double the Moon's phase-based score and the Sun's declination-based score. Skip that doubling and you under-report those two planets by close to a full rupa. This calculator applies both doublings.
Different pass marks. Some tools compare every planet to the same single number instead of each planet's own requirement. Since Mercury needs 7 rupas and Saturn only needs 5, using one shared bar mislabels planets as strong or weak.

Want to compare two tools fairly? Check which ayanamsha the other one uses first, then see whether it breaks out all six balas individually or just hands you a single total. A tool that only shows the final number is hard to reconcile with one that shows its full working.

How this calculator works, under the hood

Planet positions are pulled from the Swiss Ephemeris — the same astronomical dataset serious astrology software relies on — and converted using the Lahiri ayanamsha, the standard reference point most Indian astrologers use. The same source supplies the declination data needed for one score and the orbital data needed for another, and sunrise is calculated for your actual birth city, so the ruling hour, the weekday, and the day/night split are the ones that genuinely applied where you were born, not a generic average.

Two honest caveats, rather than hiding them: the "being watched by other planets" score is computed using whole-sign aspects (a simpler, sign-based method) instead of the more granular degree-by-degree version, which can move a borderline total by a few virupas. And one small classical correction — for two planets locked in close combat within one degree of each other — isn't applied, since it affects only a small slice of charts and even classical texts don't fully agree on how to score it. Everything else is computed in full.

Astrological content is offered for reflection and cultural interest, not as advice.

Shadbala

The six balas, in virupas