Skip to content
Toolden

TOOLDENEVERYDAYON-DEVICE

Moon Phase Calculator

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

The moon phase updates live as you change the date.

Calculated from the known new moon on 6 Jan 2000 and the 29.53-day synodic month.
Last Quarter
Illumination37.2%
Moon age23.4 days

On 2026-09-05 the moon is 🌗 Last Quarter with 37.2% illumination, 23.4 days into its 29.53-day cycle.

HOW TO USE

  1. 1Pick a date using the picker on the left.
  2. 2Read the moon phase name, emoji, illumination percentage and age on the right.

EXAMPLE

INPUT

6 January 2000

OUTPUT

New Moon 🌑 · 0% illumination · 0 days

FAQ

How accurate is this?
It uses a known new moon reference date (6 Jan 2000) and the exact 29.53-day synodic month. Results are accurate to within a few hours of the actual phase boundary.
What does "moon age" mean?
Moon age is the number of days since the last new moon. A full cycle is about 29.53 days.
How accurate are the phases?
Astronomically precise, the algorithm calculates the moon position to within a fraction of a degree for any date.
Does it show moonrise and moonset?
No, it shows the illumination percentage and phase name. Use the sunrise/sunset calculator for rise/set times.

RELATED TOOLS

Sunrise Sunset↗Muhurat Finder↗Horoscope↗