Lunar Age Calculator

The Gregorian calendar is based on the Earth's orbit around the sun (approx 365.25 days). A lunar calendar is based on the moon's phases, with a year lasting about 354.36 days. Because lunar years are shorter, your lunar age is always slightly higher than your solar age.

We calculate the total number of days you have been alive based on your Gregorian birth date. We then divide those days by the astronomical length of a lunar year (354.367 days) to find your lunar years. Remaining days are converted into lunar months (29.53 days) and days.

Not exactly. Traditional Chinese or Korean nominal age systems consider a baby 1 year old at birth and increment age on the New Year. This calculator provides a strict astronomical calculation based on the actual duration of lunar cycles compared to your exact days lived.

No, it doesn't. Because a lunar year is about 11 days shorter than a standard Gregorian year, your lunar birthday will fall on a different Gregorian date every year, shifting earlier by roughly 11 days each year.

Many ancient civilizations based their calendars on the observable cycles of the moon because it was easy to track in the night sky. Today, it remains significant for determining dates for cultural festivals, religious observances, and traditional astrology.

While this calculator gives your precise astronomical lunar age, determining your Chinese zodiac animal typically requires referencing the specific start date of the Lunar New Year for the year you were born, as the transition date changes annually in the Gregorian calendar.