Moon Phase Calculator
Find the lunar phase for any date with a visual moon diagram. See moon age, illumination percentage, phase name and next full and new moon dates.
🕐 Time & Date Tools
Free
Browser-based
Next Full Moon
Next New Moon
Previous Full Moon
Previous New Moon
The Eight Moon Phases
| Phase | Moon Age | Illumination | Description |
|---|---|---|---|
| 🌑 New Moon | 0 days | ~0% | Moon between Earth and Sun |
| 🌒 Waxing Crescent | 1–7 days | 1–49% | Right side growing brighter |
| 🌓 First Quarter | ~7 days | ~50% | Right half illuminated |
| 🌔 Waxing Gibbous | 7–14 days | 51–99% | More than half lit, growing |
| 🌕 Full Moon | ~14 days | ~100% | Moon fully illuminated |
| 🌖 Waning Gibbous | 15–22 days | 51–99% | More than half lit, shrinking |
| 🌗 Last Quarter | ~22 days | ~50% | Left half illuminated |
| 🌘 Waning Crescent | 22–29 days | 1–49% | Left side fading |
The Synodic Month
The Moon takes 29.53059 days to complete a full cycle from new moon to new moon — this is called the synodic month. The calculation uses a known new moon date (January 6, 2000) and counts elapsed synodic periods to determine the current phase for any date.