Moon Phases Calculator
Find the current moon phase and view a calendar of upcoming lunar phases. Visual moon display with illumination percentage and phase name.
🌑
New Moon
Illumination: 12%
Moon Age: 1.8 days
0%12%100%
Upcoming Phases
🌓
First Quarter
May 23, 2026
🌕
Full Moon
May 30, 2026
🌗
Last Quarter
Jun 6, 2026
🌑
New Moon
Jun 14, 2026
How to Use the Moon Phases Calculator
- Enter the required date, time, or duration values.
- Select any additional options such as time zone or format.
- View the computed result instantly.
- Copy the result or adjust inputs as needed.
Quick Reference
| From | To |
|---|---|
| 1 minute | 60 seconds |
| 1 hour | 3,600 seconds |
| 1 day | 86,400 seconds |
| 1 week | 604,800 seconds |
| 1 year | 31,536,000 seconds |
| 1 year | 525,600 minutes |
Use Cases
- •Tracking elapsed time for productivity or time management.
- •Setting precise intervals for cooking, exercise, or training.
- •Planning schedules and events across different time zones.
- •Calculating durations and deadlines for project management.
Frequently Asked Questions
What are the main moon phases?
The main phases are: New Moon, Waxing Crescent, First Quarter, Waxing Gibbous, Full Moon, Waning Gibbous, Last Quarter, and Waning Crescent. The cycle repeats approximately every 29.5 days.
How is the moon phase calculated?
The phase is calculated based on the synodic period of the Moon (≈ 29.53 days) relative to a known reference new moon date using Julian Day Numbers.
What is the synodic period?
The synodic period is the time it takes for the Moon to return to the same phase as seen from Earth — approximately 29.53 days.
Does the moon phase affect tides?
Yes. Tides are strongest during new and full moons (spring tides) when the Sun, Earth, and Moon are aligned, and weakest during quarter moons (neap tides).
What is a supermoon?
A supermoon occurs when a full moon coincides with the Moon being closest to Earth in its orbit (perigee). The Moon appears slightly larger and brighter.