Australia GST Calculator (Add or Remove 10% GST & BAS)
Add 10% GST or calculate the 1/11th GST component backwards from inclusive totals.
Moon Phase Calculator
Phase for a given date.
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About Moon Phase Calculator
Enter any date for moon age, phase name, and illumination estimate.
📐 Methodology & Reference Accuracy:
Calculations, formulas, and conversions execute locally in your web browser. Output models are benchmarked against official reference standards and updated for 2026.
🔒 This tool runs entirely in your browser. Nothing is uploaded or stored.
Background reading: Moon Phase on Wikipedia. More: all calculators.
Frequently Asked Questions about Moon Phase Calculator
How do I use the Moon Phase Calculator?
Open the Moon Phase Calculator and use the controls in the workspace below: phase for a given date. Results appear instantly in your browser, with nothing to install, sign up for, or pay for.
Is the Moon Phase Calculator free?
Yes. The Moon Phase Calculator is completely free, like every tool in the PrimeFreeTools library. There are no accounts, subscriptions, or usage limits.
Does the Moon Phase Calculator store or share my data?
No. The Moon Phase Calculator runs with JavaScript in your browser, so what you enter never leaves your device and nothing is stored on a server.
What can I use the Moon Phase Calculator for?
Enter any date for moon age, phase name, and illumination estimate. You will find it grouped under Calculators together with 116 other free tools on the PrimeFreeTools homepage.
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