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Date & Time
Moon Phase Calculator
The moon completes a full cycle of phases every 29.53 days, the synodic month. Counting from a known new moon gives the phase for any date, accurate to within a few hours.
How it works
Date
Phase (0 = new moon)
Illuminated
Moon age
Days to next full moon
Frequently asked questions
How do I use the Moon Phase Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.