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Moon Phase Calculator

See the lunar phase, illumination and moon age for any date.

Moon phase for a date

Phase: — · Illumination: —
Moon age: —
Next full moon: —
Next new moon: —
Computed from the standard lunar phase equations. Full and new moon times are given in UTC.

How to use the Moon Phase Calculator

  1. Pick the date you want to check.
  2. Read the phase name, illumination percentage and moon age.
  3. Note the dates of the next full moon and new moon.

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Frequently Asked Questions

Common questions about the free online moon phase calculator.

Choose a date and the tool shows the phase name, the illuminated fraction and the age of the moon in days.
One lunar cycle averages about 29.53 days, which is the synodic month used by this calculator.
Moon age is the number of days since the last new moon. Around 14.8 days means the moon is close to full.
It is the share of the moon's visible disc lit by the sun. It reaches about 100 percent at full moon and 0 at new moon.
This tool uses standard phase equations, so full and new moon times can differ from precise astronomical tables by up to an hour.
The result panel lists the next full moon and the next new moon after the date you selected.
The phase is nearly the same everywhere, though the moon may appear rotated in the southern hemisphere.
Yes. The moon phase calculator is free, unlimited and runs entirely in your browser.

Last updated: October 10, 2026