Moon Phase Calculator
Moon phase, illumination and age for any date, plus the next new and full moon.
How to use the Moon Phase Calculator
- Fill in what you know of: Date and time (UTC, empty = now) β leave the unknown empty.
- The results (Phase, Illumination, Moon age, Next phases (approx.)) are calculated instantly as you type.
- Use βCopy linkβ to share the calculation with the same input values.
Formula
- Synodic month = 29.530 588 853 days
About this tool
Mean-phase approximation; actual times can differ by up to ~14 hours.