Is this Moon Phase Calculator free to use?

Yes, Moon Phase Calculator is 100% free to use online with no installation or account required.

How do I use the Moon Phase Calculator?

Simply enter your values into the required input fields and click calculate to view the results instantly.

Yes, the calculator is fully responsive and compatible with Android, iOS, Windows, macOS, and Linux web browsers.

Moon Phase Calculator — Free Online Tool

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Calculate the moon phase and illumination percentage for any date

Astronomy Formula: Uses the average lunar synodic month ($29.53\text{ days}$) relative to a known New Moon baseline epoch. Select a date below.

Date Selection Input

Select Date

⚠️ Moon phase calculations provide standard astronomical approximations based on synodic cycles.

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