Next Full Moon Date Calculator
Find the next full moon after any date with its exact time in your time zone, its traditional name, supermoon, micromoon, Blue Moon and lunar eclipse flags, the Moon’s phase on your date and a calendar of the next full moons.
How it works
full moon instant = mean lunation (2451550.09766 + 29.530588861 × k Julian days) + periodic corrections for the Sun’s and Moon’s orbits (Meeus, ch. 49) − ΔT · local time = UTC + zone offset (with daylight saving) · days away = local date of the full moon − your date
The Moon is full when it sits opposite the Sun as seen from Earth. Full moons come every 29.53 days on average, but a single cycle can run from about 29.3 to 29.8 days because the Moon’s and Earth’s orbits are elliptical. Rather than adding average cycles, this calculator uses Jean Meeus’s lunar phase algorithm, which starts from the mean lunation and adds about 40 correction terms for the Sun’s pull and the shape of the Moon’s orbit. The result matches the published times of the US Naval Observatory and Royal Observatory Greenwich to within about a minute for modern dates. The instant is converted to the calendar date and clock time of the zone you choose, including daylight saving time, so you see the date the full moon falls on where you live. Each full moon also gets its traditional almanac name, its distance from Earth (flagging supermoons and micromoons), a Blue Moon flag when it is the second full moon in a month, and a lunar eclipse flag when it falls close enough to the Moon’s orbital node. The Moon’s phase, lit percentage and age on your date are shown too.
Worked example
From October 18, 2026 in US Eastern time, the next full moon is the Hunter’s Moon on Monday, October 26, 2026 at 12:12 AM (UTC−4), 8 days away and about 368,900 km from Earth. On October 18 itself the Moon is at first quarter, half lit and 8 days old. The Beaver Moon on November 24, 2026 at 9:53 AM is a supermoon at about 360,800 km, and the Cold Moon at 8:28 PM on December 23 is the closest full moon of the year at about 356,700 km — already December 24 in London. Start from early August instead and the August 28, 2026 full moon is flagged with a partial lunar eclipse.
Sources: Jean Meeus, Astronomical Algorithms (2nd ed.), ch. 47, 49 and 54 · US Naval Observatory — Phases of the Moon · Royal Observatory Greenwich — Full Moon calendar 2026 · Synodic month — Wikipedia
Frequently asked questions
How accurate are the dates and times?
Within about a minute of the US Naval Observatory and Royal Observatory Greenwich for dates between 1900 and 2100, because the calculator uses Meeus’s full lunar-phase series instead of an average 29.53-day cycle. Far from the present, times may drift by several minutes because the slowing of Earth’s rotation can only be estimated.
Why does the date differ between websites?
The full moon is a single instant, so the calendar date depends on the time zone. The March 3, 2026 full moon was at 11:38 UTC — 6:38 AM in New York and 8:38 PM in Tokyo, both still March 3, while a full moon close to midnight UTC can land on different dates in the Americas and in Europe. Pick your zone to get your local date.
What is a supermoon?
A full moon that happens near the Moon’s closest point to Earth, when it looks up to about 14% larger and 30% brighter than a full moon at its farthest (a micromoon). Here a supermoon is any full moon closer than 362,500 km; definitions vary slightly between sources.
What are the full moon names?
They are traditional North American names popularised by almanacs: Wolf (January), Snow, Worm, Pink, Flower, Strawberry, Buck, Sturgeon, Corn, Hunter’s, Beaver and Cold (December). The Harvest Moon is the full moon nearest the September equinox, so it can replace the Corn Moon or fall in October, and the Hunter’s Moon follows it.
What is a Blue Moon?
In the popular sense, the second full moon in a calendar month. Because a lunar cycle is shorter than most months, this happens about every two to three years, for example on May 31, 2026. Depending on the time zone, a full moon near midnight on the 1st or 31st can make a Blue Moon in one country but not another.
Does it show lunar eclipses?
Yes. A lunar eclipse can only happen at a full moon close to one of the Moon’s orbital nodes, and the calculator flags total, partial and penumbral eclipses. Whether you can see it depends on whether the Moon is above your horizon at the time.
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This calculator is for educational purposes. Double-check important results before acting on them.