Countdown to Next Full Moon

Find out exactly how many days remain until the next full moon, using a well-known approximation algorithm.

A full moon carries cultural and practical significance well beyond casual stargazing — tidal patterns are measurably affected by lunar phase, some wildlife behavior shifts around full moons, and plenty of traditions, from certain religious calendars to popular folklore, use the full moon as a reference point, which is part of why "when's the next full moon" is a genuinely common search rather than pure astronomy trivia.

Rather than requiring you to check a specific date's phase yourself and manually scan forward day by day until you find one, this tool automates exactly that process — starting from today and checking each subsequent date using the same Conway approximation algorithm used by the standalone Moon Phase Calculator, until it identifies the next date landing on a full moon.

The result is accurate to within about a day, consistent with the underlying approximation method — good enough for general planning purposes like scheduling a nighttime photography session or simply satisfying curiosity, though not the kind of precision an astronomer tracking an exact lunar event down to the hour would need for professional work.

1. Just open the page — it automatically scans forward to find the next full moon.