Stellium Calculator

Three or more planets in one sign or house stop being separate voices and become a chord. This calculator finds your clusters — by sign and by house, in both Tropical and True Sidereal — inside your full chart.

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What a stellium does to a chart

A stellium concentrates the chart's weight. Three planets in Virgo lean everything toward precision; three in the 10th house put unusual gravity on work and public life. It's the difference between a sign being present and a sign running the show.

And because sign boundaries move between zodiacs, a stellium can exist in Tropical and dissolve in True Sidereal — or appear only there. Checking both is the honest way to know whether your cluster is a fact of the sky or an artifact of one measuring system.

What a stellium concentrates, sign by sign

A stellium does not add a trait; it repeats one until the chart cannot ignore it. These are the themes each sign tends to amplify when it holds three or more planets.

Aries
Initiative stacked on initiative. Starting comes easily and finishing is the practice; the chart leans toward acting first and understanding the reaction afterwards.
Taurus
A concentration on what lasts: material security, physical comfort, steady loyalty. Change arrives slowly here and is trusted only once it has proven itself.
Gemini
Curiosity in quantity. Several interests run at once, language does most of the work, and boredom is the real adversary rather than difficulty.
Cancer
Belonging becomes the organising principle. Home, memory and the people counted as family carry more weight than achievement, and moods move in tides.
Leo
A strong need to be seen doing something well. Warmth and generosity are real; so is the sting when effort goes unnoticed.
Virgo
Refinement as a way of life. The chart notices what is slightly off and wants to fix it, which serves work beautifully and rest poorly.
Libra
Relationship as the lens for everything. Fairness, aesthetics and the other person's reaction are weighed before a decision, sometimes instead of one.
Scorpio
Intensity in one direction at a time. Surfaces are distrusted, depth is the goal, and privacy is guarded in proportion to how much is felt.
Sagittarius
Meaning matters more than comfort. The chart reaches for the bigger picture, the longer trip, the belief that explains it all, and resents small rooms.
Capricorn
Structure, patience and the long game. Achievement is measured in years, responsibility is picked up without being asked, and softness is earned.
Aquarius
Distance as a vantage point. Ideas, groups and the future draw more energy than the personal and the immediate; independence is non-negotiable.
Pisces
Boundaries are permeable by design. Imagination, empathy and a pull toward something larger than the self run the show; discipline is the growth edge.
Ophiuchus
Only in the true sidereal zodiac. Planets here sit in the serpent-bearer's band between Scorpio and Sagittarius: a taste for repair, for what heals, and a wariness of anything that cannot be tested.

House stelliums: where the weight lands

A house stellium says less about how you are and more about where your life keeps returning. The house names the arena; the planets in it name what you bring there.

1st house
Identity and presence. The way you enter a room is doing a lot of work; self-definition is an ongoing project rather than a settled fact.
2nd house
Resources and worth. Money, possessions and the sense of one's own value are where energy pools; earning and keeping are rarely neutral topics.
3rd house
Communication and the near world. Siblings, neighbours, short trips, daily information; the mind is busy and words carry the load.
4th house
Roots and the private self. Family of origin, home and inner life outweigh public achievement; the chart keeps returning to where it came from.
5th house
Creativity, play and romance. Self-expression is not optional here, and the chart needs an audience, a canvas or a child to pour into.
6th house
Work, health and routine. Daily habits and service to others absorb the planets' energy; the body tends to report on how life is going.
7th house
Partnership. One-to-one relationships, contracts and open rivals are where the story happens; the self is discovered through the other.
8th house
Shared resources and transformation. Intimacy, debt, inheritance, endings; the chart handles what most people avoid and is changed by it.
9th house
Belief, study and distance. Higher education, travel and philosophy pull hard; the question 'what does this mean' rarely rests.
10th house
Vocation and public role. Career and reputation are central, sometimes at the cost of the private sphere; ambition is structural, not a phase.
11th house
Groups, friends and the future. Community, causes and networks absorb the planets; the individual finds purpose through something collective.
12th house
The unseen. Solitude, the unconscious, service without credit; the planets work behind the scenes and the chart needs retreat as much as contact.

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Frequently asked questions

What is a stellium?

A cluster of three or more planets in the same sign or house — enough concentration that the sign or house stops being one note among many and becomes a dominant chord in the chart.

How many planets make a stellium?

Most astrologers say three or more in the same sign or house; some hold out for four, especially when the cluster includes slow outer planets that whole generations share. This calculator flags clusters of three and up, and you can judge the weight yourself.

What's the difference between a sign stellium and a house stellium?

A sign stellium colors how a chart expresses (three planets in Virgo lean everything precise); a house stellium concentrates where the energy goes (three planets in the 10th put unusual weight on work and public life). House stelliums need a birth time to compute.

Is the stellium calculator free?

Yes. The full result — stelliums by sign and house in both zodiacs, plus the complete chart — is free, with no payment needed.

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