Stellium Calculator

What counts as a stellium

A stellium is three or more planets in the same zodiac sign or the same house of your birth chart. This calculator counts the ten planets astrologers read first: the Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. It leaves out the Ascendant, Midheaven, lunar nodes, Chiron and asteroids. Some astrologers ask for four planets, or for the planets to sit within a few degrees of each other. Three planets in one sign or one house is the most widely used modern definition, and every number on this page uses it.

Sign stellium or house stellium

A sign stellium describes style: several planets expressing themselves through one sign’s temperament, which is why a chart can read as more Scorpio or more Capricorn than its Sun sign suggests. A house stellium describes subject: several planets working in one area of life, such as partnerships in the 7th house or career in the 10th. Signs come from the birth date, so a sign stellium holds even without a birth time. Houses come from the exact minute and place, because the houses turn through the whole zodiac once a day. The two often overlap, like three planets in Scorpio that also sit in the 8th house, and the calculator lists each one on its own.

How rare is your stellium?

It depends on how many planets gather in one place. To put real numbers on it, we cast 266,639 random births with the same engine and the same rule as this calculator: ten births for every day from 1940 to 2012, each at a random minute in one of 25 cities weighted toward where our readers live. The bigger the cluster, the rarer it gets.

• Four or more planets in one sign: about one birth in five.
• Five or more planets in one sign: about one birth in 25.
• Six or more planets in one sign: fewer than one birth in 100.
• The rarest stellium signs: Pisces and Aries, each under 4% of births.

Stellium meaning by sign

In astrology, a sign stellium turns up the volume on that sign’s way of doing things, so the planets inside it act like a committee that shares one temperament. The short versions are below, and each sign has its own full page further down.

• Aries: the initiator. Courage and drive come first; patience and follow-through are the lesson.
• Taurus: the builder. Steady, sensual and loyal, with a deep need for security and a stubborn streak.
• Gemini: the connector. Curious, quick and verbal, collecting ideas and people, prone to scattered focus.
• Cancer: the protector. Emotionally intelligent and memory-rich, devoted to home and family, sensitive to rejection.
• Leo: the performer. Warm, creative and generous, built to be seen and stung by being overlooked.
• Virgo: the craftsperson. Precise, useful and devoted to improvement, with a harsh inner critic.
• Libra: the diplomat. Drawn to partners, fairness and beauty, sometimes at the cost of their own wants.
• Scorpio: the investigator. Intense, private and perceptive, drawn to depth, power and transformation.
• Sagittarius: the explorer. Optimistic, restless and hungry for meaning, allergic to feeling fenced in.
• Capricorn: the climber. Ambitious, disciplined and responsible early, measuring life by what it builds.
• Aquarius: the reformer. Original, independent and future-minded, more at ease with groups than with closeness.
• Pisces: the empath. Imaginative, compassionate and spiritual, needing firm boundaries to stay whole.

Stellium meaning by house

A house stellium sends several planets to work in the same department of life. That area tends to take more of your time, attention and learning than the rest of the chart.

• 1st house: identity, self-image and first impressions
• 2nd house: money, values and material stability
• 3rd house: communication, learning and your local circle
• 4th house: home, roots and emotional foundations
• 5th house: creativity, romance and joyful expression
• 6th house: work routines, health and daily habits
• 7th house: partnerships and one-to-one relationships
• 8th house: shared resources, intimacy and transformation
• 9th house: beliefs, higher learning and travel
• 10th house: career direction, reputation and visibility
• 11th house: friends, community and long-range goals
• 12th house: rest, the subconscious and spiritual renewal

Why your birth time matters

Most planets change sign slowly, so your birth date settles almost every sign stellium. The exception is the Moon, which changes sign every two to three days: when the Moon is one of the three planets, the birth time can decide it. Houses are different. They turn with the Earth, about one house every two hours on average, so a rounded or unknown birth time can push planets into a neighboring house and create or erase a house stellium. If you tick “I don’t know my birth time”, trust the sign results and treat the house results as a sketch.

Where the numbers come from

Planet positions come from the Swiss Ephemeris, the astronomical engine behind astro.com and much of today’s professional astrology software. Houses use the Placidus system, with Porphyry as the fallback at extreme latitudes where Placidus cannot be drawn. Your birth time is converted to universal time with the time zone rules in force at your birthplace on that date, daylight saving included. The rarity figures on this page come from the same engine and the same stellium rule. Updated September 2026.