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Find the moon phase, illumination and age for any date.
Last Quarter
Sat, Sep 5, 2026
39.1% illuminated
23.2 days since new moon
Next new moon
Fri, Sep 11, 2026
Next full moon
Sat, Sep 26, 2026
Next 7 days
Based on the mean synodic month (29.53 days) from the new moon of Jan 6, 2000 — results are approximate (±1 day). Computed entirely in your browser.
See the moon phase for any date: pick a day and instantly get the phase name (new moon, waxing crescent, first quarter, full moon and more), illumination percentage, moon age in days and a visual rendering of the lunar disc. Also shows the next new moon and full moon dates plus a 7-day phase preview. Values are approximate (±1 day). Runs entirely in your browser.
The Moon Phase Calculator instantly provides lunar data for any selected date, including the phase name, illumination percentage, and moon age. Running entirely in the browser, it requires no sign-up or installation while delivering quick visual representations and upcoming cycle previews.
Good to know: Values are approximate within a plus-or-minus one-day margin, so users requiring precise astronomical data for scientific applications may need specialized ephemeris tools.
Quickly check the moon phase, illumination percentage, and lunar age for any specific date using your browser.
Open the Moon Phase Calculator
Navigate to the online tool in your web browser to access the lunar calendar calculator instantly.
Select your target date
Choose any past, present, or future day to calculate its corresponding lunar phase and cycle details.
View the moon phase details
Instantly see the phase name, illumination percentage, moon age in days, and a visual rendering of the lunar disc.
Check upcoming lunar events
Review the provided dates for the next new moon and full moon, along with the 7-day phase preview.
Estimated time: PT1M
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