Shadbala is the classical attempt to reduce a planet to a single number. Six sources of strength are computed separately, converted into a common unit, and added. The result lets you say that one planet in a chart is stronger than another — which no amount of arguing about dignity and house placement can settle on its own.
Shad means six. The unit is the rupa, and one rupa equals sixty shashtiamsas, which is the working unit the calculations use.
The six
1. Sthana Bala — positional strength
Strength from where the planet sits. It is itself a sum of five sub-components: dignity in the rasi chart, strength across the seven divisional charts, strength from being in an odd or even sign as suits the planet, strength from being in a kendra, a panaphara or an apoklima, and drekkana strength from the third of the sign it occupies.
This is the largest and most involved of the six, and it is where exaltation and planetary friendship enter the calculation.
2. Dig Bala — directional strength
Each planet is strongest in one of the four angles and weakest in the opposite one. The assignments follow the nature of each planet and of each direction.
| Strongest in | Direction | Planets |
|---|---|---|
| 1st house | East | Jupiter, Mercury |
| 4th house | North | Moon, Venus |
| 7th house | West | Saturn |
| 10th house | South | Sun, Mars |
The logic is legible. The planets of intellect and wisdom are strongest at the rising point; the planets of comfort and pleasure at the lowest point of the chart, which is the house of home; the planets of action and authority at the highest point; and Saturn, the planet of endings, at the setting point.
Strength falls off smoothly with distance from the ideal point, reaching zero at the opposite angle. A planet is not simply in or out of dig bala — it holds a proportion of it.
3. Kala Bala — temporal strength
Strength from when the person was born, and the most compound of the six. Its parts include: whether the birth was by day or night, and whether the planet is a day-strong or night-strong planet; the paksha, so that the Moon gains strength as it waxes; the strength of the year, month, day and hora lords; and two further components computed from the Sun and the ayana.
The day and night split is the part worth remembering. The Sun, Jupiter and Venus are strong in a day birth; the Moon, Mars and Saturn in a night birth; Mercury is strong in both.
4. Chesta Bala — motional strength
Strength from how the planet is moving. It applies only to the five star planets — the Sun and Moon never retrograde, so they take their chesta bala from a different measure.
Maximum chesta bala goes to a planet that is retrograde, and the minimum to one moving at full forward speed. This is the classical basis for treating retrogradation as strength rather than malfunction, and it is worth citing whenever someone claims a retrograde planet is weakened.
5. Naisargika Bala — natural strength
A fixed ranking that never changes, derived from apparent brightness. From weakest to strongest: Saturn, Mars, Mercury, Jupiter, Venus, Moon, Sun.
Since it is identical in every chart it never distinguishes one chart from another, but it does break ties between two planets otherwise equally placed.
6. Drik Bala — aspectual strength
Strength from what looks at the planet. Benefic aspects add, malefic aspects subtract, and the value is weighted by how exact the aspect is. This is the only one of the six that can be negative, which is how a well-placed planet under heavy malefic aspect ends up weaker than its position suggests.
The thresholds
Each planet has its own minimum required total, which is the point of the exercise — a planet is judged against its own standard, not against the others.
| Planet | Required rupas |
|---|---|
| Sun | 5.0 |
| Moon | 6.0 |
| Mars | 5.0 |
| Mercury | 7.0 |
| Jupiter | 6.5 |
| Venus | 5.5 |
| Saturn | 5.0 |
A planet at or above its threshold is considered to have sufficient strength to deliver what it promises. Below it, the promise is there but the capacity is not, and the classical reading is of results that are indicated but do not fully arrive.
Mercury has the highest bar and Saturn, Mars and the Sun the lowest, which is a reasonable reflection of how much the tradition expects each to have to work with.
What it is good for, and what it is not
Shadbala answers comparative questions. Which of two planets forming a Raja Yoga is carrying it? Is the 10th lord actually strong enough for the career the chart describes? Which planet’s dasha will deliver most?
What it does not do is tell you whether a planet is favourable. Strength and benefit are different axes entirely — a strong malefic ruling difficult houses is a strong difficulty. Shadbala measures capacity, and the houses a planet rules decide what that capacity is used for.
It also cannot be done by hand in any reasonable time. The six components with their sub-components run to dozens of separate calculations per planet. Every Vedic chart program computes it; the value in understanding the method is knowing what the number means when you read it.
Ishta and Kashta phala
A related pair worth knowing. Ishta phala is the benefic result a planet is capable of producing and kashta phala the malefic result, both computed from a planet’s exaltation distance and its chesta bala. The two always add to sixty.
This is the closest the classical apparatus comes to grading a planet as favourable rather than merely strong, and it is used alongside Shadbala rather than instead of it.
Common questions
Is Shadbala the final word on a planet?
No. It is one input. The classical order of assessment is house lordship first, then dignity, then Shadbala as the tiebreaker for comparative questions. A reading built on Shadbala numbers alone will produce confident nonsense.
Do Rahu and Ketu have Shadbala?
Not in the standard scheme, which covers the seven visible planets. Several components — dig bala, chesta bala, the day and night split — have no meaning for a geometric point.
Why does the Moon need more than the Sun?
The thresholds are given in the texts without derivation. The usual explanation is that the Moon carries more of the chart than the Sun does in the Vedic system — it is the reference for transits and the dasha — so more is required of it. That is later reasoning, not a source.
Do different programs give different Shadbala figures?
Slightly, yes. The sub-components have variant formulations in different classical sources, particularly within Kala Bala, and software authors choose between them. Differences are usually small but they are real, which is worth knowing before treating a figure as exact.
The components described here follow the classical Shadbala scheme. The interpretations attached to the resulting figures are traditional readings, not predictions about events.
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