Free Moon Phase Calculators & Lunar Tools

Calculate moon phases, track lunar events, and explore the lunar calendar. Simple, accurate, and free.

Choose a Category

🌙 Phase Calculate moon phases, illumination, and age for any date. 5 tools 📅 Calendar Lunar calendars, moonrise times, moon distance, and lunar month calculations. 5 tools 🔭 Events Find upcoming lunar events: full moons, new moons, supermoons, blue moons, and eclipses. 5 tools

Popular Tools

🌙 Moon Phase Calculator Enter any date to find the moon phase name and illumination percentage... 🌙 Current Moon Phase See today's moon phase, illumination, and age in real time.... 🌙 Moon Age Calculator Calculate the moon's age in days since the last new moon for any date.... 📅 Lunar Calendar View a monthly lunar calendar showing moon phases for every day.... 📅 Moonrise & Moonset Calculator Estimate approximate moonrise and moonset times based on moon phase.... 📅 Moon Distance Calculator Estimate the Moon's distance from Earth in km and miles for any date.... 🔭 Next Full Moon Find the exact date of the next full moon from today.... 🔭 Next New Moon Find the exact date of the next new moon from today.... 🔭 Supermoon Calculator Find the next supermoon dates and see how close each full moon is to p...

What Is a Moon Phase Calculator?

A moon phase calculator is an online tool that determines the current phase of the Moon -- or the phase on any past or future date -- based on the lunar synodic cycle of approximately 29.53 days. The Moon passes through eight recognizable phases each cycle: New Moon, Waxing Crescent, First Quarter, Waxing Gibbous, Full Moon, Waning Gibbous, Last Quarter, and Waning Crescent. A moon phase calculator tells you exactly where in this cycle the Moon is for any given date, along with the illumination percentage and the Moon's approximate age in days since the last New Moon.

Moon phase data is useful for a surprising range of activities beyond astronomy. Photographers plan nighttime shoots around Full Moon dates for natural lighting. Gardeners who follow lunar planting calendars time sowing and harvesting to specific phases -- planting leafy crops during the waxing phase and root crops during the waning phase. Anglers consult lunar tables because fish feeding activity often increases around New and Full Moon periods due to stronger tidal movements. Hikers and campers check moon phases to plan trips with adequate moonlight or minimal light pollution for stargazing.

MoonCalc provides three categories of tools: Phase calculators (moon phase for any date, current phase, moon age, and illumination), Calendar tools (monthly lunar calendar, moonrise/moonset times, moon distance, and lunar month length), and Event predictors (next full moon, next new moon, supermoon dates, and blue moon occurrences). All calculations use the synodic month formula and run entirely in your browser with no sign-up required.

Frequently Asked Questions

How long is a lunar cycle?

A complete lunar cycle (synodic month) averages 29.53059 days -- the time from one New Moon to the next. This is different from the sidereal month (27.32 days), which measures the Moon's orbit relative to the stars. The synodic month is longer because Earth moves along its own orbit during each lunar cycle, so the Moon must travel a bit further to realign with the Sun.

What is a supermoon?

A supermoon occurs when a Full Moon coincides with the Moon being at or near perigee -- its closest point to Earth in its elliptical orbit. At perigee, the Moon is about 363,300 km from Earth versus 405,500 km at apogee. A supermoon appears roughly 14% larger and 30% brighter than a Full Moon at apogee (sometimes called a micromoon).

What is a blue moon?

A blue moon has two common definitions: the more popular "monthly" definition is the second Full Moon within a single calendar month, which happens roughly every 2.7 years. The older "seasonal" definition is the third Full Moon in a season that has four Full Moons. Despite the name, blue moons have no special color -- the Moon only appears blue in rare atmospheric conditions involving volcanic ash or smoke particles.

Does the Moon affect tides?

Yes, the Moon is the primary driver of ocean tides. Its gravitational pull creates two tidal bulges on Earth -- one on the side facing the Moon and one on the opposite side. During New and Full Moon phases, the Sun and Moon align, producing stronger "spring tides." During First and Last Quarter phases, their gravitational forces partially cancel, producing weaker "neap tides."

When is the best time to photograph the Moon?

The best detail is visible during quarter phases (First or Last Quarter) when side-lighting from the Sun creates shadows that reveal craters and mountain ranges along the terminator line. For dramatic full-disc shots, photograph the Full Moon as it rises near the horizon using a telephoto lens (200mm+). The "golden hour" moonrise often has warm colors from atmospheric scattering.

About MoonCalc

MoonCalc provides free, accurate moon phase calculators and lunar tools for astronomy enthusiasts, gardeners, photographers, and the curious. All calculations use the synodic month formula with no sign-up required.

Why Use MoonCalc?