Shadbala is the six-fold measure of planetary strength from Brihat Parashara Hora Shastra: Sthana, Dig, Kala, Cheshta, Naisargika and Drik bala. It is computed for the seven visible grahas in virupas (60 virupas make one rupa) and compared with a minimum for each planet, such as 6.5 rupas for the Sun and 5 for Saturn, to see whether a planet can deliver its results.
Strength before interpretation
Two charts can share the same placement, say Guru in the 10th, and still play out very differently. Much of the difference is strength. A practitioner who judges a planet's house and sign before asking how strong it is risks promising more, or less, than the chart holds. Shadbala gives that strength a number.
The six components
Shadbala ("six strengths") is calculated for Surya, Chandra, Mangal, Budh, Guru, Shukra and Shani. Rahu and Ketu are not included in the classical scheme.
- Sthana bala (positional strength). Dignity by sign (exaltation, moolatrikona, own, friendly), strength in the varga charts, kendra placement, and odd or even sign and drekkana factors.
- Dig bala (directional strength). Guru and Budh are strongest in the 1st house, Surya and Mangal in the 10th, Shani in the 7th, and Chandra and Shukra in the 4th. Strength falls away towards the opposite house.
- Kala bala (temporal strength). Day or night birth, the paksha (waxing or waning Moon), the lords of the year, month, day and hora, ayana bala and the yuddha (planetary war) adjustment.
- Cheshta bala (motional strength). Based on the planet's motion; retrograde planets generally receive high cheshta bala. For the Sun and Moon this slot is filled differently, by ayana bala and paksha bala respectively in common practice.
- Naisargika bala (natural strength). A fixed value per planet, from the Sun (60 virupas) down through the Moon, Venus, Jupiter, Mercury and Mars to Saturn (about 8.57 virupas).
- Drik bala (aspectual strength). Benefic aspects add and malefic aspects subtract.
Rupas, virupas and the minimums
Shadbala is measured in virupas (shashtiamsas); 60 virupas make one rupa. BPHS gives the minimum each planet needs to be considered strong:
Graha | Minimum (rupas) | Minimum (virupas) |
|---|---|---|
Surya | 6.5 | 390 |
Chandra | 6 | 360 |
Mangal | 5 | 300 |
Budh | 7 | 420 |
Guru | 6.5 | 390 |
Shukra | 5.5 | 330 |
Shani | 5 | 300 |
Software usually shows the ratio of actual to required strength. A ratio above 1 means the planet meets its minimum; the planet with the highest ratio is often the strongest in the chart.
How practitioners use the numbers
- Before promising results. A well-placed but weak planet tends to give its results partially or late. A strong planet tends to express its house matters clearly, for better or worse depending on its nature and lordship.
- For dasha periods. The strength of the mahadasha and antardasha lords colours how fully their periods deliver.
- Ishta and Kashta phala. Derived from Shadbala and the planet's exaltation and cheshta values, these indicate whether a planet's capacity leans towards favourable or difficult results.
- Bhava bala. House strength builds on the lord's Shadbala plus dig and drishti factors for the house, so a strong lord usually supports its house.
Shadbala is one input. Practitioners weigh it with dignity in D9, Ashtakavarga bindus and the lordships. A number never replaces judgement.
Common mistakes
- Reading the raw virupa total instead of the ratio to the planet's minimum.
- Ignoring the birth time: Kala bala depends on hora and day or night birth, so a wrong time moves the result.
- Treating a high-Shadbala malefic as automatically favourable. Strength amplifies a planet's nature; it does not change it.
Seeing it on the desk
On Bodhlok, the Strengths module shows each component of Shadbala, the total in rupas, the ratio to the BPHS minimum and the Ishta and Kashta phala, next to Bhava bala and the Ashtakavarga. When the AI consult answers a question, Shadbala is one of the strengths the context engine pulls in, after the calculation and rule layers. The final reading stays with the astrologer.
Try it on a sample chart in the free desk at bodhlok.com.
Frequently asked questions
What is Shadbala in astrology?
Shadbala is the six-fold strength of a planet described in BPHS: Sthana, Dig, Kala, Cheshta, Naisargika and Drik bala. It is computed for the seven visible planets.
How many rupas are required in Shadbala?
BPHS gives Sun 6.5, Moon 6, Mars 5, Mercury 7, Jupiter 6.5, Venus 5.5 and Saturn 5 rupas. One rupa equals 60 virupas.
Is Shadbala calculated for Rahu and Ketu?
No. The classical Shadbala scheme covers only the seven visible grahas from the Sun to Saturn.
Which planet is strongest in Shadbala?
Compare each planet's total with its own minimum. The planet with the highest ratio of actual to required strength is usually taken as the strongest.
What is the difference between Shadbala and Ashtakavarga?
Shadbala measures a planet's inherent strength from six factors. Ashtakavarga counts benefic points contributed to each sign and is used mainly for transits and house strength.
Bring the method to a sample chart
Open the desk, load a sample chart and follow the steps above screen by screen. The free desk has everything this guide uses.