Moon Phase Calculator
The Moon cycles through eight phases every 29.5 days. This calculator uses the real synodic period to find the phase for any date — including the night you were born.
Last Quarter
58% illuminated · day 21.4 of the lunar cycle
Release. Clear out clutter, forgive, and close loops that no longer serve you.
Frequently asked questions
- How accurate is this moon phase calculator?
- It uses the real synodic month of 29.53 days measured from a reference new moon, accurate to within about a day for any date, past or future. For ritual timing that precision is more than enough.
- What was the moon phase on my birthday?
- Enter your birth date above and the calculator shows it instantly. Your natal moon phase is read in astrology as a lifelong temperament note: full moon births are said to crave visibility, new moon births to work in cycles of reinvention.
- How long does each moon phase last?
- The full cycle runs about 29.5 days through eight phases, so each phase spans roughly 3.7 days. The moon looks essentially full for about three nights around the exact moment.
- What is the best moon phase for manifestation?
- Tradition assigns intention-setting to the new moon, action to the waxing phases, and release to the full moon and waning phases. The full playbook is in our rituals guide below.