🌙
Moon Phase Calculator
Moon phase and illumination for any date.
🌒
Waxing crescent
9 %
Illumination
2.8 d
Moon age
October 26, 2026
Next full moon
November 9, 2026
Next new moon
Runs entirely in your browser. Nothing is sent anywhere.
How it works
- 1Enter your values.
- 2See the result update instantly as you type.
- 3Change any value to compare scenarios.
About this tool
Moon Phase Calculator: Moon phase and illumination for any date. Type your numbers and the result is calculated instantly — no button to press, nothing to install. All math runs locally in your browser, so the values you enter are never sent anywhere.
Example
| Result | |
|---|---|
| Waxing crescent | 🌒 |
| Illumination | 9 % |
| Moon age | 2.8 d |
| Next full moon | October 26, 2026 |
| Next new moon | November 9, 2026 |
How do I use the Moon Phase Calculator?
Enter your values. See the result update instantly as you type. Change any value to compare scenarios.
Is the Moon Phase Calculator free?
Yes. It is completely free with no sign-up, no usage limits and no watermark.
Is my data sent to a server?
No. Everything is calculated locally in your browser. Nothing you enter is uploaded, logged or stored.
Does it work on my phone?
Yes. It works in any modern browser on Android, iPhone, iPad, Windows, Mac and Linux — no app needed.