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Next Full Moon Calculator

Find the approximate date of the next full moon.

Next full moon

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What this calculator does

This calculator estimates the date of the next full moon from any date, using the moon's phase cycle(about 29.53 days) from a known reference full moon.

Worked example

Counting from September 3, 2026, the next full moon falls on approximatelySaturday, September 26, 2026.

Common mistakes

  • Expecting exact-hour precision. This is a calendar-date approximation, accurate to within about a day — check an astronomical almanac for the precise time.
  • Assuming it's the same date worldwide. Because the exact moment of full moon can fall near midnight, viewers in different time zones may see it on the previous or next calendar date.

Frequently asked questions

How accurate is this full moon date?+

It uses a well-known astronomical reference new moon and the average synodic month length (about 29.53 days), which is accurate to within roughly a day — precise enough for general reference, though dedicated astronomical almanacs are more exact.

Why do full moons sometimes get special names, like "Harvest Moon"?+

Many cultures name each month's full moon based on seasonal or agricultural traditions — for example, the Harvest Moon is the full moon closest to the September equinox.

How often does a full moon occur?+

A full moon happens roughly every 29.53 days, so there are typically 12 in a year, occasionally 13.

When is the next full moon?+

Enter today's date (or any date) above and this online calculator instantly estimates the date of the next full moon, plus how many days away it is.

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