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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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.

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

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

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

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