Moon Phase Calculator (Moon Tonight)
Moon phase calculator: the phase and illumination of the moon for any date, its age in days and the next full and new moon.
age = (date − new moon Jan 6, 2000) mod 29.53 days
How to use this calculator
- Type your input in the box.
- The result updates as you type.
- Use “Copy result” or “Copy link” to share it.
The moon goes through a full cycle every 29.53 days (the synodic month). The calculation uses a mean cycle, so dates can be off by up to about a day.
Frequently asked questions
Moon phase on April 8, 2024?
New moon (the day of the total solar eclipse).
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