What is Shadbala?
Shadbala means “six strengths”. It is the classical Vedic method of putting a number on how much power each of the seven planets actually holds in a chart, by measuring six independent sources of strength and adding them together.
The point of it is comparison. Any astrologer can argue that Jupiter is well placed; Shadbala says Jupiter reached 428 virupas against a requirement of 390 while Saturn reached 266 against 300, and the two planets can then be ranked rather than debated. It is the closest thing the tradition has to a measuring instrument.
The six balas
- Sthana bala (positional) — strength from where the planet sits. Five parts: nearness to its exaltation degree, its dignity across seven divisional charts, whether it holds an odd or even sign as it prefers, whether it occupies an angle, and which third of the sign it falls in.
- Dig bala (directional) — each planet has a direction it is happiest in. Jupiter and Mercury want the ascendant, the Sun and Mars the tenth, Saturn the seventh, the Moon and Venus the fourth. Strength is measured as distance from the opposite, powerless point.
- Kala bala (temporal) — the largest and most time-sensitive of the six. It covers whether the birth was by day or night, the phase of the Moon, which third of the day or night it fell in, the ruling hour, weekday, month and year, and the planet's declination.
- Chesta bala (motional) — strength from movement, at its greatest around retrogression. The Sun and Moon never retrograde, so they borrow: the Sun takes its declination strength and the Moon its lunar-phase strength.
- Naisargika bala (natural) — a fixed ranking that never varies by chart, led by the Sun at 60 virupas and descending to Saturn at 8.57.
- Drik bala (aspectual) — the net of the aspects a planet receives. Benefic aspect adds, malefic aspect subtracts, so this is the one column that can come out negative.
Rupas, virupas and the required strength
Shadbala is counted in virupas, and sixty virupas make one rupa. What matters is not the raw total but the total against the requirement, because each planet is held to a different standard:
- Sun, Mars, Saturn — 5 rupas (300 virupas)
- Venus — 5.5 rupas
- Moon — 6 rupas
- Jupiter — 6.5 rupas
- Mercury — 7 rupas, the highest bar of the seven
So a Mercury on 400 virupas is weak while a Saturn on the same 400 is comfortably strong. Quoting Shadbala totals without their requirements — which a surprising number of tools do — makes the strongest planet look like whichever one happens to score highest, and that is not what the system says.
Strong does not mean good
This is the most common misreading, so it is worth stating plainly: Shadbala measures capacity, not benevolence. It tells you how forcefully a planet can act on whatever it governs, not whether you will enjoy the result.
A powerful malefic acts powerfully in its own character. A benefic below its requirement may promise things it cannot deliver. The useful reading is to take Shadbala together with the houses a planet rules and the dasha periods it governs — strength tells you how loudly a planet speaks, and the rest of the chart tells you what it is saying.
Why birth time matters more here
Most calculators on this site tolerate a rough birth time. This one does not, and it is worth knowing why before you read too much into a result.
Kala bala reads the hour directly — the ruling hora changes every hour, and the thirds of the day and night shift the score by a full 60 virupas at their boundaries. Dig bala is measured from the ascendant, which moves a whole sign roughly every two hours. An hour of error can move a planet across its required total in either direction.
Why other calculators give different numbers
Shadbala totals vary between tools far more than most people expect, and a difference does not by itself mean one of them is wrong. The main causes:
- Ayanamsha. This site uses Lahiri. A tool set to Raman or KP shifts every longitude by a degree or two, which moves Uchcha bala and can change a planet's sign in the divisional charts that feed Sthana bala.
- House system. Kendradi bala depends on which house a planet occupies, and whole-sign, equal and Sripati houses disagree near a cusp. That single component is worth up to 45 virupas.
- Missing components. Many free tools implement three or four of the six and quietly skip Tribhaga bala and the year, month, weekday and hour lords. Those are worth 150 virupas between them.
- The two doublings. The Moon's Paksha bala and the Sun's Ayana bala are each doubled in Parashara. A tool that omits them under-reports those two planets by up to a full rupa. This one applies both.
- Required totals. Some tools compare every planet against one figure. The requirements genuinely differ — Mercury needs 7 rupas and Saturn 5 — so a shared threshold mislabels planets as strong or weak.
If you want to compare like with like, check the other tool's ayanamsha first, then whether it shows all six balas separately. A tool that only prints a total cannot be reconciled with one that shows its working.
How this calculator works
Planetary positions come from the Swiss Ephemeris and are converted to sidereal longitudes with the Lahiri ayanamsha, the Indian standard. Declinations for Ayana bala and heliocentric positions for Chesta bala are taken from the same source, and sunrise is computed for the latitude of your birth city so that the hora, the weekday and the thirds of the day are the ones that actually applied where you were born.
Two things are worth stating rather than hiding. Drik bala is computed from whole-sign graded aspects rather than the degree-wise sphuta drishti curve, which moves borderline totals by a few virupas. And Yuddha bala, the correction for two planets at war within one degree of each other, is not applied — it affects a small minority of charts and the classical rule for who wins is not agreed on. Every other component is computed in full.