Moon Phase Calculator

Find the exact lunar phase, illumination percentage, and moon age for any date.

Select Date

Date

Result

—

Illumination: —

0% — 100%

Moon Age

—

since last new moon

Cycle Progress

—

of 29.53-day cycle

7-Day Phase Strip

Learn how lunar phases work and how to use this tool effectively.

View Tutorial

Phase Reference

New Moon0% lit

Waxing Crescent1–49%

First Quarter~50% lit

Waxing Gibbous51–99%

Full Moon100% lit

Waning Gibbous99–51%

Last Quarter~50% lit

Waning Crescent49–1%

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