Moon Sign Calculator
Your Moon sign is the emotional heart of your chart, the inner self you feel before you ever put it into words.
While your Sun sign describes how you shine outward, your Moon sign describes your private world: how you feel, what soothes you, how you rest and recover, and what you instinctively reach for when life turns demanding. It governs your moods, your memory, and the quiet reflexes that shaped you long before you could name them.
The Moon moves quickly, changing sign roughly every two and a half days, and sometimes within a single day. That is why your birth date alone is not enough; the exact time matters. This calculator uses the Swiss Ephemeris, the same high-precision engine trusted by professional astrologers, to place the Moon by degree against the tropical zodiac for your precise birth moment. Enter your details, read your sign below, then continue to your full free birth chart to see how your Moon works alongside your Sun, your rising sign, and every other placement.
Frequently Asked Questions
Is the Moon sign calculator free?
Yes. The calculator is completely free, with no payment and no subscription. From here you can also continue to your full birth chart, which is free as well after you sign in.
Do I need my exact birth time?
It helps a great deal. The Moon changes sign roughly every two and a half days, so on some dates your sign depends on the hour. If you were born near a sign change, the exact time is what settles which Moon sign is truly yours.
What is a Moon sign?
Your Moon sign is the zodiac sign the Moon occupied at your birth. It represents your emotional inner self: your instincts, what makes you feel safe, how you nurture and need to be nurtured, and the private side of your personality.
How accurate is it, and what if I am on a cusp?
We calculate the Moon by exact degree with the Swiss Ephemeris, so the result is astronomically precise. If you were born on a day the Moon changed sign, only your exact birth time can confirm the answer, and that is exactly when a few minutes truly matter.