Shadbala — The Sixfold Planetary Strength System in Vedic Astrology

Shadbala (षड्बल, literally 'sixfold strength') is the classical Vedic framework for comparing six sources of planetary strength: Sthana, Dig, Kala, Chesta, Naisargika and Drik Bala. The calculator on this page is explicitly a four-factor preview; it does not present the unimplemented Kala and Drik components as a full classical score.

Sthana Bala (स्थान बल) measures a planet's strength based on the sign it occupies. An exalted planet receives the highest positional strength. A planet in its own sign (swakshetra), moolatrikona range, friend's sign, neutral sign, or debilitation sign each receive progressively lower Sthana Bala. This is the most commonly referenced strength indicator in chart reading — when an astrologer says 'Sun is strong because it is exalted in Aries,' they are describing high Sthana Bala.

Dig Bala (दिग् बल) measures whether a planet is placed in the part of the chart where its energy acts with confidence. In practice, it explains why two planets with similar sign dignity can behave differently: one may be directionally supported and visible, while another works against the chart's natural orientation. Use Dig Bala as a strength modifier when judging authority, initiative, relationships, and public action.

Chesta Bala (चेष्टा बल) captures the planet's motion state. In Vedic astrology, retrograde planets are considered to be making extra effort — they receive elevated Chesta Bala (+15 points in the simplified engine). A combust planet (too close to the Sun) is weakened and receives negative Chesta adjustment. Fast direct planets receive moderate strength; slow direct planets receive less. The Sun and Moon, which never retrograde, receive a nominal Chesta Bala value. BPHS Chapter 30 defines the full vakra/anuvakra/vikala motion categories.

Naisargika Bala (नैसर्गिक बल) is the planet's built-in baseline before house placement, aspects, motion, or birth timing are considered. It keeps the Shadbala total anchored to the natural hierarchy described by BPHS, so the reading does not treat every graha as starting from the same power level. After this baseline is set, the other Bala components show how the individual kundali raises or reduces that promise.

Kala Bala (काल बल) adds the condition of the birth moment to planetary strength. It asks whether the graha is supported by the clock, calendar, lunar condition, and seasonal half active at birth. Because this component has multiple classical sub-calculations, Ishvaram keeps the displayed value at 0.0 until the full BPHS method is implemented instead of showing a partial temporal score as final.

Drik Bala (दृक् बल) measures strength gained or lost through aspects from other planets. A benefic planet aspecting another strengthens it; a malefic aspect weakens it. Unlike Western astrology's simple aspect list, Vedic aspects follow graded strength rules — Saturn's 3rd and 10th house aspects have different intensities than its 7th house aspect. Computing Drik Bala requires knowing every planet's exact aspect angle, intensity, and benefic/malefic nature. The Ishvaram engine returns 0.0 for Drik Bala pending full aspectual implementation.

Do not choose an upay from a strength score alone. Use the preview to see which computed factors deserve a closer look, then judge the planet with its houses, aspects, dasha, divisional charts and the two remaining Bala components. A chart-specific report can add that context before suggesting an upay.