Your moon sign is the zodiac sign the moon was travelling through at the moment you were born. It describes how you feel, what makes you feel safe and how you respond emotionally, which is why many people find it says more about their inner world than their sun sign does.
Enter your birth details below and this free moon sign calculator will show your moon sign and the exact degree it sat at. The moon’s position is calculated in your browser from astronomical formulas. Your details are never stored or sent anywhere.
How the Moon Sign Calculator Works
- You enter your date, time and place of birth. We use the time zone you choose, including its historical daylight saving rules, to convert your local birth time to universal time.
- The calculator works out the moon’s ecliptic longitude at that exact moment, which is its position along the zodiac measured in degrees from 0° Aries.
- Each zodiac sign covers 30 degrees, so the longitude tells us the sign and how far through it the moon was.
Why Your Birth Time Matters
The moon moves about 13 degrees a day, far faster than any other body in your chart, so it changes sign roughly every two and a half days. That means that on a little under half of all dates the moon changes sign at some point during the day, and the exact time of birth decides which of the two signs is yours. On the other dates, the answer is the same whatever time you were born.
If you don’t know your birth time, the calculator checks your date and tells you which case applies. If the moon changed sign on your birthday, you’ll see both signs and the time of the change. Your parents, a birth certificate or your birth records are the best places to find the exact time.
How Accurate Is This Calculator?
The calculator uses a published model of the moon’s orbit (a truncated form of Jean Meeus’s lunar series from Astronomical Algorithms). We tested it against an independent astronomy library across thousands of dates between 1900 and 2100. For births between 1950 and 2050 the position agreed to within about half a minute of the moon’s travel, and across the whole 1900–2100 range to within about two minutes.
In practice, the only way to get a different sign is to have been born within a couple of minutes of the moment the moon changed sign. If your result is that close to the edge, the calculator tells you.
It uses the tropical zodiac of Western astrology. Vedic (sidereal) astrology uses a different zodiac that sits about 24 degrees behind, so a Vedic moon sign will often differ from the one shown here.
What Does Your Moon Sign Mean?
Once you know your moon sign, read the full guide for it. Each one covers emotional needs, love and relationships, strengths and the shadow side of the placement.
Curious how two moon signs get on? See our guide to the best moon signs for love, or the pairing guides such as Aries and Libra and Scorpio and Leo.
Frequently Asked Questions
How do I find my moon sign?
Enter your date, time and place of birth into the calculator above. It works out the moon’s position at that moment and tells you which zodiac sign it was in, along with the exact degree.
Can I find my moon sign without my birth time?
Often, yes. The moon spends roughly two to three days in each sign, so on many dates it stays in a single sign all day. If it changed sign on your birthday, the calculator shows both possibilities and the time of the change, so you can check against what you know about when you were born.
Why is my moon sign different on another website?
The usual causes are a different time zone or daylight saving setting, an approximate birth time, or a different zodiac. This calculator uses the tropical zodiac used in Western astrology and applies the historical time zone rules for the place you choose.
Is my moon sign the same in Vedic astrology?
Not usually. Vedic (sidereal) astrology measures the zodiac from a different starting point that sits about 24 degrees behind the tropical zodiac, so a Vedic moon sign (Rashi) is often the sign before your Western one.
What does my moon sign mean?
Your moon sign describes your emotional nature: what makes you feel safe, how you react under stress and what you need from close relationships. Our moon sign meanings guide covers all twelve.
Go Beyond Your Moon Sign
Your moon sign is one piece of your birth chart. Your free personalised moon reading explores it alongside your sun and rising signs and your wider chart.
Get My Free Moon Reading →