Planet Sign Calculator

Mercury is the mind and how you talk. Its sign shows how you learn, how you put thoughts into words and how fast you make up your mind.

Mars is drive, desire and anger. Its sign shows how you go after what you want, how you compete and what it looks like when you lose your temper.

Jupiter is growth and luck. Its sign points to where you tend to be optimistic, generous or lucky, and what kind of learning or travel expands your life.

Saturn is discipline and lessons. Its sign shows where you feel pressure, where you build slowly, and what you have to earn rather than receive. Your first Saturn return comes around age 29.

Your Sun, Moon and rising sign get most of the attention, but these four planets fill in the rest of the picture. Venus has its own page: use the Venus sign calculator.

Planets cross the zodiac at very different paces:

• Mercury changes sign every few weeks. It stays close to the Sun, so it is always in your Sun sign or one of the neighboring signs.
• Mars spends roughly six to seven weeks in a sign on average, though retrograde periods can stretch that to several months.
• Jupiter stays about a year in each sign, and takes about 12 years to go around the zodiac.
• Saturn stays two to three years in each sign, and takes about 29 years to go around.

That's why so many people share a Jupiter or Saturn sign with their classmates, while Mercury and Mars signs are much more personal.

A planet is retrograde when it appears to move backward through the zodiac, which is an effect of Earth's orbit. Mercury, Mars, Jupiter and Saturn all do it, and the calculator tells you whether each one was retrograde at birth.

In a birth chart, a retrograde planet is traditionally read as working more inward. Its themes are processed privately or revisited later in life rather than expressed straight away. Many people have at least one retrograde planet, and it isn't a flaw.

• Mercury in Aries: quick, blunt thinker who speaks first and refines the idea afterward.
• Mercury in Taurus: unhurried mind that weighs every detail and rarely changes its opinion.
• Mercury in Gemini: curious, witty and restless, with a talent for chatter and quick learning.
• Mercury in Cancer: thinks through memory and mood, and learns best when a subject feels personal.
• Mercury in Leo: warm, expressive speaker who likes telling a story with some flair.
• Mercury in Virgo: precise and analytical, spotting errors and small details other people skim past.
• Mercury in Libra: weighs both sides before deciding and phrases things with tact.
• Mercury in Scorpio: probing mind that digs for motives and keeps its conclusions private.
• Mercury in Sagittarius: big-picture thinker, candid to a fault, drawn to philosophy and travel.
• Mercury in Capricorn: organized, practical planner who thinks in goals, schedules and long-term results.
• Mercury in Aquarius: original thinker who likes theory, technology and unconventional ideas.
• Mercury in Pisces: imaginative mind that absorbs impressions more easily than facts or figures.

• Mars in Aries: fast, direct energy that acts first and thinks later.
• Mars in Taurus: steady, stubborn drive that is slow to anger and hard to stop.
• Mars in Gemini: scattered energy spread across many projects, with a taste for arguing.
• Mars in Cancer: drive fueled by emotion, with anger that shows up as moodiness or withdrawal.
• Mars in Leo: proud, theatrical drive that goes after goals and wants recognition for the effort.
• Mars in Virgo: efficient energy aimed at fixing problems, plus a sharp eye for flaws.
• Mars in Libra: avoids open conflict, prefers negotiation, and can be slow to say what it wants.
• Mars in Scorpio: intense, strategic force with huge stamina and a long memory for slights.
• Mars in Sagittarius: restless enthusiasm that chases adventure, competition and room to roam.
• Mars in Capricorn: disciplined ambition that builds toward long goals and outlasts the competition.
• Mars in Aquarius: acts on ideals and causes, and resists being told what to do.
• Mars in Pisces: gentle, drifting energy that follows intuition, avoids confrontation and tires easily.

• Jupiter in Aries: bold risk-taker who finds luck by starting things and going first.
• Jupiter in Taurus: growth through patience, steady earning and a love of comfort.
• Jupiter in Gemini: opportunity arrives through conversation, short trips, networks and constant learning.
• Jupiter in Cancer: generous and protective, expanding through family, home and caring for others.
• Jupiter in Leo: big-hearted and confident, with luck that comes from creativity and visibility.
• Jupiter in Virgo: improves through skill, service and careful work, though prone to over-worrying.
• Jupiter in Libra: fortune comes through partnerships, fair dealing and a diplomatic reputation.
• Jupiter in Scorpio: gains through research, shared resources and refusing to give up.
• Jupiter in Sagittarius: in its home sign: optimistic, philosophical, and fond of travel and higher learning.
• Jupiter in Capricorn: success is earned slowly through structure, responsibility and cautious optimism.
• Jupiter in Aquarius: faith in progress, with luck arriving through friends, groups and big ideas.
• Jupiter in Pisces: compassionate and spiritual, growing through imagination, faith and forgiveness.

• Saturn in Aries: learns patience and self-control, and has to build independence the hard way.
• Saturn in Taurus: lessons about money, security and self-worth, building slowly toward things that last.
• Saturn in Gemini: disciplined study and careful speech, with some doubt about its own voice.
• Saturn in Cancer: guarded feelings and a heavy sense of family duty; security has to come from within.
• Saturn in Leo: fear of being judged, and a lesson in earning confidence rather than demanding applause.
• Saturn in Virgo: exacting standards for work and health, with a pull toward perfectionism.
• Saturn in Libra: takes commitment and fairness seriously, and matures through long-term relationships.
• Saturn in Scorpio: lessons about trust, control and loss, ending in unusual emotional resilience.
• Saturn in Sagittarius: tests every belief, distrusts easy answers, and ends up with a hard-won worldview.
• Saturn in Capricorn: in its home sign: ambitious, dutiful, a natural builder who respects authority.
• Saturn in Aquarius: learns where it belongs in a group, and brings structure to unconventional ideas.
• Saturn in Pisces: lessons about boundaries and faith, giving shape to dreams that could otherwise dissolve.

Planet positions come from the astronomy-engine library, which computes where each planet really was on your date. It's the same calculation behind our birth chart. Signs use the tropical zodiac, which is standard in Western astrology.

With only a date, the calculator uses the middle of the day. If a planet changed signs on your birthday, it shows both signs, and a birth time and place settles which one is yours. Adding a time and place also gives the house each planet falls in.

Astrology is a symbolic tradition, and this calculator is for reflection and entertainment.