Mercury Sign Calculator
Your Mercury sign describes how your mind works: how you take in information, how you speak and write, and how you learn. Enter your birth date to find it. Mercury is never far from the Sun, so it is in your Sun sign or one of the two signs either side.
Enter your birth date in the form on this page to cast your answer. The result appears on this page, and your birth details are remembered on this device so other tools can fill them in.
Mercury in each sign
Mercury spends two to four weeks in a sign, so your birth date is almost always enough. On the day it changed sign, the time decides.
Mercury in Aries: The quick mind
You think fast and say it straight. Decisions come before the full facts, and you would rather fix a wrong answer than wait for the perfect one. You argue to win and forget the argument quickly. Long meetings and slow explanations test your patience; short, direct conversations bring out your best.
Mercury in Taurus: The steady mind
You think slowly and thoroughly, and once you have made up your mind it stays made up. You learn by doing and remember what is useful. You speak carefully and rarely waste words. People trust your judgment because it does not change with the mood of the room.
Mercury in Gemini: The curious mind
Mercury rules Gemini, so your mind runs at full speed: quick, witty, interested in everything and able to hold several ideas at once. You learn by talking and think out loud. Your risk is spreading attention too thinly; your gift is connecting people and ideas nobody else connected.
Mercury in Cancer: The remembering mind
You think with your feelings and remember everything, especially how things were said. You read tone before words and pick up what is left unspoken. You speak more freely with people you trust. Your memory for personal detail makes you a natural keeper of family and team history.
Mercury in Leo: The persuasive mind
You think in big, confident strokes and speak with conviction. You are a natural storyteller and presenter, and you like your ideas to be noticed. Once you believe something you defend it warmly. Criticism of an idea can feel personal, which is worth knowing in a debate.
Mercury in Virgo: The precise mind
Mercury is at home in Virgo, so your mind is exact, analytical and practical. You notice errors others miss and like to improve whatever you are given. You explain things clearly and in order. The risk is worrying over details; the gift is getting things right.
Mercury in Libra: The diplomatic mind
You think in terms of balance and see every side of a question, which makes you fair and sometimes slow to decide. You speak gracefully and choose words that keep the peace. You think best in conversation with someone else, testing ideas against another person.
Mercury in Scorpio: The investigating mind
You think deeply and look for what is hidden. You notice motives, keep your own counsel and ask the question nobody else wants asked. You are hard to fool and hard to read. When you do speak frankly, people remember it.
Mercury in Sagittarius: The big-picture mind
You think in principles and possibilities and love ideas that explain everything. You speak honestly, sometimes too honestly, and enjoy teaching and debate. Detail bores you, so you do your best thinking with someone else checking the small print.
Mercury in Capricorn: The strategic mind
You think practically and plan ahead. You want to know what an idea is for and whether it will work. You speak with authority and few words, and you are taken seriously for it. Your thinking gets sharper and more respected with age.
Mercury in Aquarius: The original mind
You think independently and often ahead of your time. You are drawn to systems, technology and ideas that change how people live. You debate on principle and are hard to talk out of a position. You see patterns across groups that others miss.
Mercury in Pisces: The imaginative mind
You think in images, feelings and impressions rather than straight lines. You pick up what people mean even when they say something else. Facts and schedules can slip away from you; stories, music and intuition do not. You often know before you can explain why.
What your Mercury sign tells you
Mercury is the planet of thinking and communication. Its sign gives the style: fast or slow, blunt or diplomatic, big picture or detail. It explains why two people with the same Sun sign can argue completely differently.
Your Mercury sign is especially useful in relationships and at work, where most friction comes from people processing information in different ways.
How this calculator works
Enter your birth date, and a time and place if you have them. The calculator casts the same chart as the full birth chart, from the Moshier ephemeris in the tropical zodiac, and reads the sign and degree of one point. Mercury moves quickly but stays within 28 degrees of the Sun.
Common questions
Why is my Mercury sign different from my Sun sign?
Mercury can be up to 28 degrees from the Sun, so it is often in the sign before or after yours.
What if Mercury was retrograde when I was born?
The calculator still gives the correct sign. A retrograde Mercury at birth is read as a reflective, think-before-speaking mind.
Find yours
See your Mercury with every other planet, its house and its aspects. Full birth chart
Mercury in your chart today
Transiting Mercury touches your natal planets several times a month. A Precision Horoscope names the ones active today. Get my free personal reading