Tool Nova

Space Tools

Moon Phase Calculator by Date

Estimate the Moon phase, lunar age, and illuminated percentage for any selected date.

Lunar calendar

Moon Phase Calculator

Estimate the Moon phase, lunar age, and illuminated percentage for any date.

Date
Estimated phaseWaxing CrescentIllumination11.4%Lunar age3.2 daysAstronomical conditions can shift exact phase times slightly.

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How the moon phase calculator works

Enter or choose the values requested by the tool.

The result updates instantly in your browser without uploading personal data.

Review the result and adjust inputs to compare different scenarios.

Frequently Asked Questions

Is the moon phase calculator free?

Yes. The tool is free to use and does not require an account.

Is my data uploaded?

No. The calculation runs locally in your browser unless the tool clearly identifies an external public data source.

Should I treat the result as exact?

Use the result as a practical estimate. Real-world outcomes can vary with assumptions, source data, and individual circumstances.