Almanac & sky · NUMORA
Leap Month Calculator
Whether this lunar year has a leap month.
Open interactive calculatorHow to use
Scan the ICU Chinese calendar.
Formula
month marked bis in relatedYear
FAQ
Is this Leap Month calculator accurate?
The formula and assumptions are shown on the page, and the engine is covered by audit tests. Results are for reference — not financial or medical advice.
Do I need an account?
No. Calculations run in your browser. Recents can stay on this device.
What inputs do I need?
Scan the ICU Chinese calendar.
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