Age calculator
Enter your date of birth to calculate your exact age in years, months and days. Find out what day of the week you were born and how many days until your next birthday.
Your exact age
36 years, 7 months, 19 days
Day of week born
Monday
Days until next birthday
134 days
Frequently asked questions
How is exact age calculated?
Exact age is calculated by counting the full years, months and days between a date of birth and today's date. The calculation accounts for varying month lengths and leap years. A person born on 15 March 1990 turns 36 years old on 15 March 2026, regardless of how many days are in the intervening years.
What happens to birthdays on 29 February in a leap year?
People born on 29 February (leap day) only have a true birthday every four years. In non-leap years, most people celebrate on either 28 February or 1 March — personal preference varies and there's no legal standard. For official purposes like driving licences in many countries, 28 February is used as the recognised birthday in non-leap years.
How do different cultures calculate age?
In Western countries, age increases on your birthday each year, starting from 0 at birth. In traditional Korean age reckoning, everyone is considered 1 year old at birth and ages increase on New Year's Day rather than birthdays — meaning a Korean age is typically 1–2 years higher than an international age. South Korea officially moved to the international age system in 2023.
Why do I need to know the day of the week I was born?
Beyond pure curiosity, knowing your birth day has some practical uses — certain astrological and numerological systems use it, and it occasionally comes up in historical or genealogical research. The calculation uses a formula called Zeller's Congruence or the Doomsday algorithm to determine the day of the week for any historical date.