Age Calculator is a free online tool that calculates your exact age from your birth date.
Supports both Gregorian and lunar calendar inputs. Results include precise age (years/months/days), total days, total months, zodiac sign, Chinese zodiac, nominal age, and countdown to your next birthday. All calculations happen locally in your browser — no data is ever sent to any server.
Features
Supports Gregorian and lunar calendar date input
Real-time age calculation as you type
Displays precise age in years, months, and days
Zodiac sign and Chinese zodiac lookup
Shows nominal age (traditional East Asian age)
Countdown to your next birthday
How to Use
1Select your birth date using the date picker
2Toggle to lunar calendar mode if needed
3View your age, zodiac, Chinese zodiac and more
4All data is processed locally for privacy
FAQ
What is the difference between nominal age and actual age?
Actual age counts the exact years since birth. Nominal age is a traditional East Asian method where you are 1 at birth and gain 1 year at each Lunar New Year. Nominal age is usually 1-2 years older than actual age.
What's the difference between Gregorian and lunar calendars?
The Gregorian calendar is the internationally used solar calendar based on Earth's orbit around the sun. The lunar calendar is based on moon phases and is used for traditional festivals and birthdays in many East Asian cultures.
Can I calculate someone else's age?
Yes, simply enter their birth date. All calculations stay in your browser — no data is stored or transmitted.
How is age calculated?
The system compares the birth date with the current date, precisely computing years, months, and days elapsed, accounting for leap years and varying month lengths.
Is my data safe?
Absolutely. Everything runs locally in your browser. No data is sent to any server, and no personal information is stored.
What about February 29 birthdays?
If you were born on February 29 (leap day), the system uses February 28 in non-leap years to calculate your next birthday countdown.