What moon phase was I born under?
Enter your birth date and see the moon exactly as it looked that night — its phase, how much of it was lit, and the moon sign. Free, in seconds, for any date between 1900 and 2100.
What is your birth moon?
Your birth moon is the exact phase the moon was in on the day you were born — a new moon, a thin crescent, a half moon or a full moon. It repeats only about every 19 years on the same date, so it is a genuinely personal detail of the night you arrived.
Many people keep their birth moon as a personal symbol. As a personalised poster with your date and name it becomes a gift for a birthday, a new baby or an anniversary that no shop can sell twice.
How the birth moon calculator works
- 1Enter your birth date (or that of a loved one).
- 2The calculator instantly shows the moon phase, illumination and moon sign.
- 3Optionally turn your birth moon into a personalized poster.
Frequently asked questions
How do you calculate the moon phase on my birthday?+
The calculator uses astronomical formulas (the SunCalc library) to work out the moon’s position for your exact date and shows the phase as it appeared in the sky. It works for any date between 1900 and 2100, anywhere in the world.
Is the birth moon calculator free?+
Yes. The calculation is completely free and needs no sign-up. Only the optional personalised poster costs from €9.90.
What is my moon sign?+
Your moon sign is the zodiac sign the moon was passing through at the time of your birth — in astrology a popular complement to the sun sign. The calculator shows it for every birth date.
Can I turn my birth moon into a gift?+
Yes. A personalised birth moon poster with the date, place and name is a unique gift for a birth, a birthday or an anniversary — delivered as a print-ready file minutes after ordering.
Your birth moon as a poster
Turn your birth moon into a personalized work of art — with your date, location and name. Print-ready at 300 DPI, instant download.
Create moon poster