Age & zodiac calculator
See the days you have lived and your upcoming birthday.
Calculation inputs
Birth dates, reference dates and results are never stored or transmitted. Only an explicitly selected country is remembered in this browser; clear site data to remove it.
Calculation result
Calculation rules
- International age increases on the birthday. This calculator treats March 1 as the birthday of February 29 births in non-leap years.
- The next birthday includes the reference date. If it is your birthday, the remaining days are 0. For leap-day births, the next birthday is also March 1 in non-leap years.
- Days lived is the difference between the two dates. The day of birth is day 0; time of day and time zones do not affect the calculation.
- Traditional counting age = reference year minus birth year plus 1. Calendar-year age = reference year minus birth year.
- The animal sign uses the Gregorian birth year. Lunar New Year and the start of spring are not considered.
- Zodiac signs are for entertainment and use the fixed date table below. Birth time, location and astronomical positions are not used; boundaries may differ from other tables.