Shadbala Calculator

A shadbala calculator answers one of the most quantitative questions in Vedic astrology: not just where your planets sit, but how much strength each one carries to deliver its promises. Shadbala, literally “six strengths,” is the classical system from the Brihat Parashara Hora Shastra that scores every planet on six different kinds of power, adds them into a single total measured in rupas, and then checks that total against a traditional minimum each planet must reach to be considered functionally strong. This free calculator computes all six strengths for the seven classical planets (Sun, Moon, Mars, Mercury, Jupiter, Venus, Saturn) from your birth date, time, and timezone, shows every component in a transparent table, and marks each planet PASS or BELOW MINIMUM against the classical thresholds.

The calculation is deterministic and fully disclosed. Your birth details become a single UTC instant; the seven planets’ sidereal longitudes are computed with a standard planetary theory minus the Lahiri ayanamsa; and the six balas are derived from those longitudes and the birth time by named classical formulas. Because this calculator does not ask for your birthplace, it is Lagna-independent: the two Lagna-dependent components use a clearly stated natural-zodiac simplification instead of your ascendant, and the tool says so wherever it matters. The page loads with a worked example already rendered, so you can inspect real numbers before typing anything.

What is Shadbala

Shadbala is the most rigorous quantitative framework in Jyotish for planetary strength. Two charts can both show Jupiter in the 5th house, yet one Jupiter delivers and the other disappoints; the classical answer is that sign placement alone never tells the whole story. Shadbala scores six dimensions of strength and adds them: a planet may be weak by sign but rescued by directional or temporal strength, or strong by sign yet undermined by malefic aspects. The final total, expressed in rupas (with 60 virupas, also called shashtiamshas, to the rupa), lets you compare planets directly and judge which ones can carry weight in the chart.

The six strengths each measure a different dimension of planetary power. Sthana bala is positional strength: how strong the planet is by zodiacal placement, including exaltation, sign dignity, odd/even signs, house angularity, and decanate. Dig bala is directional strength: each planet has a house of the chart where its direction gives it maximum power. Kala bala is temporal strength: the time of birth itself, including the weekday, the planetary hour, the lunar phase, and whether it was day or night. Chesta bala is motional strength: how much apparent effort the planet is making, highest near opposition to the Sun. Naisargika bala is natural strength: a fixed constant per planet that never changes between charts. Drik bala is aspectual strength: the net help or harm from aspects the planet receives, the only component that can go negative.

Tradition then sets a bar. The classical texts prescribe a minimum total, in rupas, that each planet should reach to be considered strong enough to deliver its results: Sun 5, Moon 6, Mars 5, Mercury 7, Jupiter 6.5, Venus 5.5, Saturn 5. A planet at or above its minimum is read as functionally strong; a planet below it is read as weak and a candidate for strengthening. These thresholds are the verdict line this calculator draws, and they are sourced and cited in the method note rather than asserted.

One honest framing note before you use the tool. The astronomical half of this page is computed with real orbital mechanics and checked against published references: the planetary longitudes, the Lahiri ayanamsa, and the arithmetic of each bala are all verifiable numbers. The interpretive half, what a weak Venus or a strong Saturn means for a life, belongs to astrology’s symbolic language, transmitted for centuries in the Jyotish tradition. Take what resonates, hold it lightly, and enjoy the precision of the calculation underneath it.

How to use this calculator

1. Enter your birth date. Pick the year, month, and day. Dates from 1900 to 2100 are accepted.
2. Enter your birth time if you know it. Shadbala is time-sensitive: the weekday lord, the planetary hour, the day/night thirds, and the day/night strength all depend on the birth time, so an accurate time matters more here than in many calculators. If you do not know the time, tick “I do not know the birth time” and the tool uses 12:00 noon local time and marks the whole result provisional.
3. Choose the timezone of the birthplace. Pick the nearest city from the dropdown, or choose “Custom UTC offset” and type the offset in hours if your city is not listed.
4. Check daylight saving. DST is not auto-applied. If the birthplace observed summer time on the birth date, adjust your time or enter the offset that was actually in effect, for example UTC+1 for a summer birth in London rather than UTC+0.
5. Press “Compute my Shadbala.” The tool converts your birth time to UTC, computes the seven planets’ sidereal longitudes, derives the six balas for each planet, totals them in rupas, and checks each total against its classical minimum.
6. Read the spotlight. The strongest and weakest planets by strength ratio (total divided by minimum), and how many of the seven meet the classical minimum, are summarized at the top.
7. Walk the tables. The main table shows each planet’s six balas, total, minimum, ratio, and verdict; below it, the Sthana and Kala sub-component tables show exactly how those two totals were built.
8. Copy or print your result. The copy button saves a plain-text summary with every planet’s numbers for your notes, and the print button produces a clean black-and-white version.

How this calculator computes your Shadbala

The calculation starts by turning your birth details into a single astronomical instant. Your birth date, birth time, and UTC offset become a UTC timestamp, which becomes a day number d on the standard scale where d = 0 is 2000 Jan 0.0 UT. In date-only mode the tool uses 12:00 noon local time for this step and labels the result provisional.

The planets’ positions come from the standard low-precision planetary theory: geocentric tropical longitudes for the Sun, Moon, Mercury, Venus, Mars, Jupiter, and Saturn are computed from their orbital elements with the usual perturbation terms, then the Lahiri ayanamsa is subtracted to give the sidereal longitudes used in Vedic astrology. The linear Lahiri formula is ayanamsa = 23.85696 + (JD – 2451545.0) / 36525 x 1.396971 degrees, where JD is the Julian day of birth. Rahu and Ketu are excluded from Shadbala per tradition, which scores only the seven classical planets.

Sthana bala adds five positional sub-components, each in rupas. Uchcha bala is the planet’s angular distance from its deep debilitation point divided by 180, giving 1 rupa at exact exaltation and 0 at exact debilitation (deep exaltation points: Sun 10 Aries, Moon 3 Taurus, Mars 28 Capricorn, Mercury 15 Virgo, Jupiter 5 Cancer, Venus 27 Pisces, Saturn 20 Libra). Saptavargaja bala scores the D1 sign dignity on a simplified classical table: 0.5 for own sign (an exalted sign counts as own), 0.375 for a friendly sign lord, 0.25 for neutral, 0.125 for enemy (a debilitated sign counts as enemy), using the natural friendship table. The classical Saptavargaja weighs seven divisional charts with compound relationships; this tool uses the D1 sign only and says so. Oja/Yugma bala gives 0.25 when a male planet (Sun, Mars, Jupiter, Mercury, Saturn) stands in an odd sign or a female planet (Moon, Venus) in an even sign. Kendradi bala gives 1 rupa in kendra houses (1, 4, 7, 10), 0.5 in panapara (2, 5, 8, 11), and 0.25 in apoklima (3, 6, 9, 12). Drekkana bala gives 0.25 to male planets (Sun, Mars, Jupiter) in the first decanate, neuter planets (Mercury, Saturn) in the second, and female planets (Moon, Venus) in the third.

Dig bala is directional strength scaled by distance: rupa = max(0, 1 – angular distance to the dig-bala house cusp / 180), so a planet at its strength cusp scores the full 1 rupa and one 180 degrees away scores 0. The classical cusps are the true house cusps derived from the birth Lagna (Mercury and Jupiter the 1st, Sun and Mars the 10th, Moon and Venus the 4th, Saturn the 7th). Because this calculator asks for no birthplace and therefore has no Lagna, it measures against the natural zodiac instead: Mercury/Jupiter to Aries 0 degrees, Sun/Mars to Capricorn 270 degrees, Moon/Venus to Cancer 90 degrees, Saturn to Libra 180 degrees. This is the disclosed Kalapurusha simplification, and classical software using your ascendant will give different Dig values. Kendradi houses above are counted the same way, on the natural zodiac with Aries as the 1st house.

Kala bala adds six temporal components. Natonnata bala is day/night strength: diurnal planets (Sun, Jupiter, Venus) score max(0, 1 – |local hour – 12| / 12), nocturnal planets (Moon, Mars, Saturn) score max(0, 1 – distance from midnight / 12), and Mercury always scores 1. Day is taken as a fixed 06:00 to 18:00 local because no latitude is available for true sunrise and sunset. Paksha bala is lunar-phase strength on a binary simplification: benefics (Moon, Mercury, Jupiter, Venus) score 1 rupa when the Moon is waxing and 0.5 when waning, malefics (Sun, Mars, Saturn) the reverse, from the Moon-Sun elongation. The classical scale runs continuously with the phase and doubles the Moon; this tool does neither and says so. Vara bala gives 1 rupa to the weekday lord (the classical 45 virupas = 0.75 rupa, rounded here). Hora bala gives 1 rupa to the planetary-hour lord, with hours cycling Sun, Venus, Mercury, Moon, Saturn, Jupiter, Mars from the day lord across the fixed 12 day and 12 night hours. Ayana bala is 0.5 plus or minus 0.5 depending on whether the tropical Sun stands in the planet’s preferred half of the year (Uttarayana for Sun, Mars, Jupiter, Venus; Dakshinayana for Moon, Saturn; Mercury always 0.5). Tribhaga bala gives 1 rupa to Mercury, Sun, or Saturn for birth in the first, second, or third third of the day, to Moon, Venus, or Mars for the first, second, or third third of the night, and to Jupiter always. Omitted from Kala: Abda (year lord), Masa (month lord), and Yuddha (planetary war, which applies only when two star-planets stand within 1 degree).

Chesta bala is motional strength from elongation: chesta = 0.33 + 0.67 x (angular distance from the Sun / 180), so 0.33 at exact conjunction and 1.0 at exact opposition, applied uniformly to all seven planets. Classical texts instead substitute Ayana bala for the Sun and Paksha bala for the Moon; that substitution is disclosed here but not implemented, keeping one transparent formula. Naisargika bala is the fixed natural strength per planet in rupas: Sun 1.0, Moon 6/7, Mars 5/7, Mercury 4/7, Jupiter 3/7, Venus 2/7, Saturn 1/7, the BPHS weekday order that matches the constants printed by traditional Shadbala software. Some modern web sources list a brightness order instead (Venus 42.86, Jupiter 34.29, Mercury 25.71, Mars 17.14 virupas); results will differ if you compare against those. Drik bala is aspectual strength on a simplified table: +0.25 per qualifying aspect from a natural benefic (Jupiter, Venus, Mercury, Moon), -0.25 per qualifying aspect from a natural malefic (Sun, Mars, Saturn), counting conjunction and opposition within 10 degrees, trine within 8, and sextile within 6, capped at +1 or -1 rupa. The classical sputa-drishti computation with special aspects is more elaborate; this is the disclosed simplification.

The total is the sum of the six balas in rupas, and the verdict compares it with the classical minimum: Sun 5, Moon 6, Mars 5, Mercury 7, Jupiter 6.5, Venus 5.5, Saturn 5. At or above the minimum reads PASS; below it reads BELOW MINIMUM. The strength ratio (total divided by minimum) is also shown, since a planet at 1.2 times its minimum is meaningfully stronger than one barely scraping past. One edition variance to know: several published calculators and articles give the Sun a minimum of 6.5 rather than 5.0; this tool uses 5.0 per its cited references and flags the alternative.

Worked example

Here is a worked example so you can see exactly what the tool computes. The tool loads with this example ready: birth date August 24, 1995, birth time 14:30, timezone Delhi, India (UTC+5:30), a Thursday.

First the time conversion. 14:30 at UTC+5:30 is 09:00 UTC, day number d = -1589.625, Julian day 2449953.875. The Lahiri ayanamsa is 23.7961 degrees. The engine’s sidereal longitudes: Sun 126.95 (Leo 6.95), Moon 105.82 (Cancer 15.82), Mars 177.14 (Virgo 27.14), Mercury 149.64 (Leo 29.64), Jupiter 222.43 (Scorpio 12.43), Venus 127.88 (Leo 7.88), Saturn 329.10 (Aquarius 29.10). The Moon is waning (338.87 degrees ahead of the Sun is past the 180-degree waxing half), and the tropical Sun at 150.75 degrees puts the birth in Dakshinayana, the southern half of the year.

The Kala components follow from the clock. Thursday’s lord is Jupiter, so Jupiter takes the 1 rupa of Vara bala. At 14:30 the planetary hour lord is Mars (hours cycle Sun, Venus, Mercury, Moon, Saturn, Jupiter, Mars from the day lord), so Mars takes the Hora rupa. The birth falls in the third third of the day, whose ruler is Saturn, so Saturn takes the Tribhaga rupa, and Jupiter takes one as always. Natonnata gives the diurnal planets 1 – 2.5/12 = 0.79 and the nocturnal planets 1 – 9.5/12 = 0.21, with Mercury at 1. Paksha gives the waning-Moon rupa of 1.0 to the malefics and 0.5 to the benefics. Ayana gives 1.0 to Moon, Mars, and Saturn (Dakshinayana planets), 0 to Sun, Jupiter, and Venus, and 0.5 to Mercury.

The full per-planet results, in rupas, are:

• Sun (Leo 6.95): Sthana 1.85 + Dig 0.21 + Kala 1.79 + Chesta 0.33 + Naisargika 1.00 + Drik 0.25 = 5.43 (minimum 5.0, ratio 1.09): PASS. The Drik +0.25 comes from Venus conjunct within a degree; Jupiter’s square is not counted under this tool’s aspect list.
• Moon (Cancer 15.82): 2.35 + 0.91 + 1.71 + 0.41 + 0.86 + 0.25 = 6.48 (minimum 6.0, ratio 1.08): PASS. Dig is high near its Cancer strength cusp; the +0.25 Drik comes from Jupiter’s trine.
• Mars (Virgo 27.14): 0.70 + 0.48 + 3.21 + 0.52 + 0.71 + 0.00 = 5.63 (minimum 5.0, ratio 1.13): PASS. Kala carries it: the Hora rupa, waning Paksha rupa, and Dakshinayana Ayana rupa.
• Mercury (Leo 29.64): 2.04 + 0.17 + 2.00 + 0.41 + 0.57 – 0.25 = 4.94 (minimum 7.0, ratio 0.71): BELOW MINIMUM. Mercury’s minimum is the highest of all planets, and the -0.25 Drik from Saturn’s opposition drags it further down.
• Jupiter (Scorpio 12.43): 1.17 + 0.24 + 3.29 + 0.69 + 0.43 + 0.25 = 6.06 (minimum 6.5, ratio 0.93): BELOW MINIMUM. It takes the Vara rupa as Thursday’s lord and the Tribhaga rupa, but the Dakshinayana Ayana 0 and a weak Sthana leave it short.
• Venus (Leo 7.88): 0.90 + 0.79 + 1.29 + 0.33 + 0.29 – 0.25 = 3.35 (minimum 5.5, ratio 0.61): BELOW MINIMUM, the weakest planet here by ratio. In an enemy’s sign with a -0.25 Drik from Saturn, little compensates.
• Saturn (Aquarius 29.10): 1.53 + 0.17 + 3.21 + 0.92 + 0.14 + 0.25 = 6.22 (minimum 5.0, ratio 1.24): PASS, and the strongest planet of the chart by ratio. Own sign, the Tribhaga rupa, waning Paksha, Dakshinayana Ayana, and near-opposition Chesta of 0.92 all stack up.

So 4 of the 7 planets meet their classical minimums. The spotlight reads: strongest Saturn at ratio 1.24, weakest Venus at ratio 0.61. In traditional reading, Saturn’s strength would be counted as able to deliver its significations in this chart, while Venus falls well short of its bar. As always, this is the symbolic layer for reflection; the astronomical layer, seven computed longitudes and six arithmetic strengths per planet, is the verifiable part.

How to read your result

Your result has three parts. First, the spotlight: the strongest and weakest planets by strength ratio, how many of the seven meet the classical minimum, and the Lahiri ayanamsa used. The ratio matters more than the raw total, because each planet is judged against its own bar: a Mercury at 6.5 rupas fails its minimum of 7, while a Saturn at 6.5 would pass its minimum of 5 comfortably.

Second, the main table: one row per planet with the six balas in rupas, the total, the classical minimum, the ratio, and the PASS or BELOW MINIMUM verdict. Scan the Sthana column for positional dignity, the Kala column for time-based support, and the Drik column for the only component that can go negative: a planet with good Sthana but negative Drik is traditionally read as well-placed but under pressure from malefic aspects.

Third, the sub-component tables: Sthana broken into Uchcha, Saptavargaja, Oja/Yugma, Kendradi, and Drekkana, and Kala broken into Natonnata, Paksha, Vara, Hora, Ayana, and Tribhaga, so you can see exactly which piece lifts or sinks each planet. If a planet fails its minimum, these tables show where the points were lost: a missing Hora rupa, a Dakshinayana Ayana 0 for a diurnal planet, or an enemy-sign Saptavargaja.

A few reading notes from the tradition. A below-minimum planet is not a doomed planet: the classical texts treat the minimum as the bar for full, unaided delivery of results, and weakness in one component can be offset by strength elsewhere or by remedies in the tradition. Drik bala deserves special attention because it reflects the planet’s company: a planet under heavy malefic aspect can underperform its placement, while one backed by Jupiter’s aspect can overperform. And Shadbala never stands alone: house lordship, yogas, and dasha periods all modulate what a strong or weak planet actually does, so read the numbers as one instrument panel among several.

The classical minimum thresholds

The verdicts on this page use the minimum Shadbala each planet must reach, in rupas, as prescribed in the classical texts and confirmed by the cited references:

• Sun: 5.0 rupas
• Moon: 6.0 rupas
• Mars: 5.0 rupas
• Mercury: 7.0 rupas
• Jupiter: 6.5 rupas
• Venus: 5.5 rupas
• Saturn: 5.0 rupas

Mercury carries the highest bar at 7.0, which is why Mercury so often lands below minimum even in decent placements: it needs substantial strength to function well given its inherently variable nature. The Moon’s 6.0 reflects the traditional view that mental stability demands robust lunar strength, while Mars and Saturn share the lowest bar at 5.0.

The Sun’s threshold deserves a special note because published sources disagree. The references this calculator follows give the Sun 5.0 rupas, but several modern calculators and articles give the Sun 6.5 instead. Under the 6.5 rule, a Sun at 5.43 rupas like the worked example would flip from PASS to BELOW MINIMUM. This is a genuine edition variance in the published literature, not a calculation error on either side, so always check which threshold a second source uses before comparing verdicts.

What this calculator does not do

Honest limits, stated plainly. This tool is Lagna-independent by design: it asks for no birthplace, so it has no ascendant, and the two Lagna-dependent components (Dig bala and the Kendradi part of Sthana bala) are measured on the natural zodiac with Aries as the 1st house. Classical software that uses your birth Lagna will give different values for exactly those components; everything else is computed identically. It does not compute Ishta Phala or Kashta Phala, the derivative measures of desirable and difficult results, nor Bhava bala (house strength), dashas, transits, or yogas; it answers the six-fold planetary strength question only. The Saptavargaja bala is simplified to the D1 sign with natural friendships, where the classical method weighs seven divisional charts with compound relationships. The Kala bala omits the year lord, month lord, and planetary-war components, rounds the weekday lord to a full rupa, and uses a fixed 06:00 to 18:00 day instead of true sunrise and sunset. The Chesta bala uses one uniform elongation formula rather than the classical Sun and Moon substitutions. The engine is a low-precision planetary theory, accurate to arcminutes, which is ample for bala work but not ephemeris grade. Finally, nothing here is a prediction: planetary strengths are traditional quantitative measures, offered for reflection and entertainment.

Frequently asked questions

What is Shadbala?

Shadbala, meaning ‘six strengths,’ is the classical Vedic system for scoring planetary strength. Each of the seven classical planets is measured on six kinds of power, Sthana (positional), Dig (directional), Kala (temporal), Chesta (motional), Naisargika (natural), and Drik (aspectual), and the six are added into a single total in rupas. That total is then checked against a traditional minimum per planet to judge whether the planet is strong enough to deliver its results.

What are the six strengths in Shadbala?

The six strengths are Sthana bala (strength by zodiacal placement: exaltation, sign dignity, odd/even signs, house angularity, decanate), Dig bala (strength by direction or house, peaking in each planet’s directional house), Kala bala (strength by time of birth: weekday, planetary hour, lunar phase, day or night), Chesta bala (strength by apparent motion and elongation from the Sun), Naisargika bala (fixed natural strength per planet), and Drik bala (net strength from aspects received, the only component that can be negative).

How is Shadbala measured in rupas and virupas?

Shadbala is measured in rupas, with each rupa divided into 60 virupas (also called shashtiamshas). Classical texts score each component in virupas from 0 to 60 and convert the total by dividing by 60. This calculator works directly in rupas, so a planet with 5.43 rupas carries 5 rupas and about 26 virupas, judged against its classical minimum in the same units.

What are the minimum Shadbala thresholds for each planet?

The classical minimums in rupas are Sun 5, Moon 6, Mars 5, Mercury 7, Jupiter 6.5, Venus 5.5, and Saturn 5. A planet at or above its minimum is traditionally read as strong enough to deliver its significations; a planet below its minimum is read as weak. Mercury has the highest bar at 7 rupas, while Mars and Saturn share the lowest at 5.

Why do some sources give the Sun a different minimum strength?

Because the published literature genuinely disagrees on this one value. The references this calculator follows give the Sun 5.0 rupas, matching the classical set used by several traditional sources, but a number of modern calculators and articles give the Sun 6.5 rupas instead. A Sun between 5.0 and 6.5 rupas therefore passes here and fails there. This is an edition variance, not a calculation error, so check which threshold any second source uses before comparing verdicts.

Why does this calculator not ask for my birthplace?

Because every component it computes is Lagna-independent except two, and those two use a disclosed simplification. Sthana (except Kendradi), Kala, Chesta, Naisargika, and Drik need only the birth moment, not the location. Dig bala and the Kendradi part of Sthana classically need the ascendant, so this tool measures them on the natural zodiac with Aries as the 1st house and says so openly. If you compare with software that uses your birthplace, expect those two components to differ while the rest match.

Is this shadbala calculator free?

Yes, it is completely free and no account or signup is needed. Enter your birth date, birth time, and timezone to get the six-fold strength of all seven classical planets in rupas, each checked against its classical minimum with a PASS or BELOW MINIMUM verdict, plus the Sthana and Kala sub-component tables. Use the copy button to save your result as plain text.

Related tools

• Ashtakavarga calculator: another classical strength system, scoring each planet’s transit strength through the ashtakavarga points of your chart.
• Raja yoga calculator: find the classical yogas in your chart, whose results the Shadbala strengths help you weigh.
• Vedic birth horoscope calculator: your full sidereal chart with planets, signs, and houses, the wider context behind every strength score.

About the author

This Shadbala calculator was built by Saba for ZodiaScope. Saba builds astronomy-accurate astrology tools alongside traditional interpretations: the planetary longitudes on this page are computed with a standard planetary theory minus the Lahiri ayanamsa, the six balas follow the classical Brihat Parashara Hora Shastra framework with every simplification disclosed on the page, and the minimum-strength thresholds are verified against published sources, while the strength meanings follow traditional Jyotish teachings. Interpretations are offered for reflection and entertainment.

Published: October 24, 2026. Last updated: October 24, 2026.