Moon Phase Calculator
Curious about the moon tonight? Pick any date — past or future — to see the phase name, how much of the moon is illuminated, its age in days, and exactly when the next full moon and new moon will fall.
Pick a date to see the moon phase.
How to use
- Pick any date — today is already filled in for you.
- Read the phase name, the illuminated percentage and the moon's age in days.
- See exactly how many days remain until the next full moon and new moon.
- Change the date to compare moon phases across different weeks or months.
Tips
- The illuminated percentage is highest for a day or two around the full moon — ideal for moonlit photos.
- Moonrise shifts about 50 minutes later each day, which is why the moon seems to move through the evening.
- New-moon nights are the darkest, which makes them ideal for stargazing.
- Dates shown are calendar dates; actual moonrise times depend on your location.
Uses the standard synodic month of 29.530588853 days counted from the known new moon of 6 January 2000, 18:14 UTC. Phase boundaries are approximate to within a few hours, which is normal for calendar moon calculators.