Moon Phase Calculator
See the moon's phase and how much of it is lit on any date, with the next full moon and new moon.
Moon phase
Waxing crescent
- Illuminated
- 7.37%
- Days since new moon
- 2.6
- Next full moon
- 24 November 2026
- Next new moon
- 9 December 2026
On 12 November 2026 the moon is a waxing crescent, about 7% lit. The next full moon is around 24 November 2026.
How it's worked out
- Moon's age
days since a known new moon, modulo 29.5306 days2.6 days
- Next new and full moon dates are in UTC, from the moon's true orbit; the phase and lit share use the average lunar month. The start of an Islamic month depends on sighting the new crescent, usually a day or two after the astronomical new moon.
How it works
Moon's age = days since a known new moon, modulo 29.53 · Lit fraction = (1 − cos(2π × age ÷ 29.53)) ÷ 2
A moon about 7 days old is at first quarter, half lit; at about 14.8 days it's full.
Questions people ask
How long is a lunar cycle?
About 29.53 days from one new moon to the next, which is why Islamic months have 29 or 30 days.
Is the new moon the start of the Islamic month?
Not exactly. The month begins when the thin crescent is first seen after the new moon, usually a day or two later.
How accurate is this?
The next new and full moon dates follow the moon's true orbit, to within a minute or so, and are given in UTC. The phase name and lit share use the average lunar cycle, so they can be a little off near a change of phase.
About this calculator
Formula and rules last checked 25 October 2026Written and tested by the CalculatorDex teamReport a problem