Age calculator
Calculate your exact age in years, months, and days. Enter your date of birth below.
How age is calculated
Age is measured as the number of complete years, months, and remaining days from your date of birth to today's date. A "complete year" means the same month and day have passed. For example, someone born on June 15 turns one year older each June 15.
Age in different units
Years: The standard measure. You are 0 years old until your first birthday.
Months: Multiply years by 12 and add remaining months. 30 years, 6 months = 366 months.
Weeks: Divide total days by 7. 10,000 days ≈ 1,428 weeks.
Days: Accounts for leap years (366 days) and regular years (365 days).
Leap year birthdays
People born on February 29 (leap day) technically have a birthday every 4 years. Legally, most jurisdictions treat March 1 as their birthday in non-leap years. They still age one year per year like everyone else.
Age milestones in days
1,000 days ≈ 2 years, 9 months. 10,000 days ≈ 27 years, 5 months. 20,000 days ≈ 54 years, 9 months. 30,000 days ≈ 82 years, 2 months.
Frequently asked questions
How old am I if I was born in 1990?
If born in 1990, you are 35 or 36 years old in 2026, depending on whether your birthday has passed this year.
What is chronological age vs biological age?
Chronological age is the time since birth (what this calculator measures). Biological age reflects your body's physical condition and can differ from chronological age based on health, lifestyle, and genetics.