Moon sign calculator: find your Moon sign
Use this free Moon sign calculator to find the sign the Moon was in when you were born. Your birth date is usually enough; add the time if you know it, in case the Moon changed signs that day.
Astrologers read the Moon sign as your private weather: your moods, your instincts, the things that calm you down or set you off. It is the side that only the people closest to you ever see.
The Moon spends only two to two and a half days in each sign. Most birthdays fall well inside one of those stretches, but if the Moon switched signs on the day you were born, the hour decides which one you get.
You also get your Sun and Rising signs and a daily reading built on your chart.
Moon sign calculator: what your Moon sign says about you
If your Sun sign is the story you tell about yourself, your Moon sign is the feeling underneath it. It covers the reactions that arrive before you have time to think, and the things that make you feel safe, soothed or rattled.
It also speaks to home and family, to the way you look after people and want to be looked after, and to how you carry the past. Think of the Sun as the house, the Rising as the front porch, and the Moon as the kitchen at the back, where you are most yourself.
Plenty of people say their Moon sign "feels more like me" than their Sun. The Sun describes who you are working toward; the Moon describes how you actually get through a Tuesday.
Why you can't guess your Moon sign from a birthday
The Sun takes a year to go around the zodiac. The Moon does it in about 27 days, roughly twelve times as fast.
For most people that is good news, because a couple of days in one sign means the date alone settles it. The catch is the changeover days. If the Moon moved into a new sign on your birthday, the hour you were born decides whether it had crossed yet.
A baby born at breakfast might have a Cancer Moon and one born that evening a Leo Moon. Same date, different emotional makeup, and no lookup table of birthdays can tell them apart. You need the Moon's actual position at that hour.
Moon sign vs. Sun and Rising
The calculator returns your Sun, Moon and Rising together, the "Big Three," because each one answers a different question.
The Sun is your core identity, the self you grow into over a lifetime. The Rising is the first impression you make, and it needs an exact birth time because it changes every couple of hours. The Moon is what you privately feel and what your heart needs.
Someone with an Aries Sun, a Capricorn Rising and a Pisces Moon can aim high, look calm and still cry at commercials. Those gaps between the three explain a lot, and the Moon is usually the piece people know least about. From here, your full birth chart places every planet and house.
How the calculation works
We take your date, your time if you have one, and the coordinates of your birthplace, convert to universal time, and read the Moon's ecliptic longitude from an ephemeris based on NASA JPL data, the same way professional astrology software does.
On a changeover day even the time zone matters. A birth in Chicago in February 1974, for example, fell during the country's emergency year-round daylight saving time, so a calculator using today's rules would be an hour off. On a cusp day an hour can put the Moon in the wrong sign, so we use the rules that were in force where and when you were born.
The same birth data always gives the same result. For the full method, read how we compute your chart.
Your Moon sign, sign by sign
What the Moon tends to feel like in each sign. Tap a sign for its daily horoscope.
Quick to flare and quick to cool, the Moon in Aries deals with feelings by doing something about them. You need independence and a fresh challenge, and sulking bores you; you would rather have it out and move on.
Good food, a familiar couch, a routine that holds: that is what the Moon in Taurus needs to feel safe. You are hard to rattle and slow to change, and the care you give is loyal and patient.
With the Moon in Gemini you talk a feeling through before you sit with it. Variety keeps you content, and you can explain an emotion so fast that people mistake it for detachment. Conversation is how you get close.
The Moon rules Cancer, so here it is at home. Your moods come and go like tides, you look after the people you love without being asked, and family and the past stay close to your heart. You need a safe nest.
Big-hearted and a little dramatic, Leo Moon people love generously and want to be noticed for it. Play and affection are how you comfort yourself and everyone around you.
When feelings run high, the Moon in Virgo reaches for a to-do list. You feel safest when things are in order and you can be useful, you can be quietly hard on yourself, and you show love with small practical favors.
Conflict throws the Moon in Libra off balance, so you smooth things over almost by reflex. You settle best with a partner, in pleasant surroundings, once things feel fair again.
Everything goes deep with the Moon in Scorpio, and most of it stays private. You bond hard, you need real trust, you notice undercurrents other people miss, and you do not forget easily.
Give the Moon in Sagittarius room to roam and it stays cheerful. You recover from a bad day with a trip, a book or a long drive, you hate feeling fenced in, and you meet hard feelings with a joke and some perspective.
Self-control is the comfort zone for the Moon in Capricorn. You keep feelings at arm's length until you trust someone, you feel secure when your work is solid, and you show care by being the one who shows up.
Even in a close relationship, the Moon in Aquarius needs breathing room. You think your feelings through, value friendship over clinginess, and feel safest when nobody expects you to be anyone but yourself.
Other people's moods soak right into the Moon in Pisces. You are tender and imaginative, you recharge with quiet, music or anything creative, and you often feel someone else's sadness almost as your own.
Continue exploring
Frequently asked
Do I need my birth time for my Moon sign?+
Usually not. The date is normally enough, unless the Moon changed signs that day. Adding the time removes any doubt.
What if I was born on a cusp?+
Then the hour matters. With a time we can tell which side of the line the Moon was on. Without one, the calculator shows the more likely sign, and you may want to read both.
What does the Moon sign mean?+
It describes how you react emotionally, what comforts you and what you need from home and the people closest to you.
What is the difference between my Moon sign and my Sun sign?+
Your Sun sign is the one in the horoscope columns, set by your birthday. Your Moon sign can be any of the twelve, whatever your Sun, and it describes your emotional side.
Is the Moon sign calculator free, and do I need an account?+
Yes, it's free, and you don't need to sign up. A full natal chart reading covering every planet, house and aspect is an optional paid upgrade.
How accurate is Sigastra's Moon sign calculation?+
It matches professional astrology software, provided you add your birth time on a changeover day.